IBM 3277 Troubleshooting Manual

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Maintenance Library

Display Station Models 1

Troubleshooting Guide

and

2

SY27-2314-5

Preface

The

IBM

3270

Information Display System consists of
control units, display stations, printers, and optional
feature devices. This manual contains
required

to

maintain

IBM

3277 Display Stations and

all

the

information

features such as keyboards, selector-light pen, magnetic
card reader, security keylock, and audible alarm. The
purpose of this

manual

is

to

present maintenance and repair

information rather than theory of operation information.

This

manual

is

organized

in

eight sections. Sections 1
and 2 contain introductory and maintenance background
material. Sections 3, 4, and 5 contain the Symptom Index,
Troubleshooting Diagrams, and repair data. These three

all

sections contain
mation necessary
Miscellaneous reference data
Section 7 contains location diagrams
and locating
other

sections

display station are presented

To successfully use this
display stations, maintenance personnel
of training equivalent
Because the
units,

3277

an

understanding of

display station

diagnostic procedures and repair infor-

to

correct a display station malfunction.

is

included

the

display station components referenced

of

this manual. Instructions for installing the

in

Section 8.

manual and repair

to

aid

in

Section 6.

in

identifying

IBM

should have a

to

the

3270

attaches

is

attached

system basic

to

both local and remote control

the

control unit

is

also helpful.

FE

to

which the

in

3277

level

course.

The titles and form numbers

Trou

bleshooting
"Companion
tain a glossary

Manuals". Both Troubleshooting Guides con-

Guides are listed below under

of

terms

that

of

the

are applicable

two

and display stations.

Companion Manuals:

3271

•

Guide,

3272

•

Guide,
3275/3277

•

Catalog,

•

IDR-M
Catalog,

Control

SY27-2311

Control

SY27-2312

ID

Unit

Unit

Display

Models 1

Models 1

Station

and

and

Models

2

Troubleshooting

2

Troubleshooting

1 and

S 126-0006

Reader-Motorized Theory-Maintenance-Parts

SY26-4188

The following pUblications may also prove useful:

•

An

Introduction

System,

•

IBM

GA27-2739

3270

Description, GA27-2749

to

Information

the

3270

Information

Display System Component

control unit

to

control units

2 Parts

Display

Sixth

Edition

(July,

This

is a major

SN31-0146.

mation

Troubleshooting

This
periodically
subsequent revisions

Text

been removed,
Product

©Copyright

is

throughout

made
illustrations

edition

for

this

A

form

is

Publications,

ii

revision

The

TN L incorporated

included

Diagram in

are

indicated

applies

made

manual

provided

comments

International

1975)

of,

and obsoletes,

in

Chapters

the

manual.

by a vertical

to

display

to

the

or

Technical Newsletters.

has

been prepared

at

the

back

may

Dept.

4,

Chapter

Significant

stations

information

of

this

be addressed

52L,

Neighborhood

Business Machines

SY27-2314-4

maintenance

5, and 7. Several

4.

Other

line

at

Board EC level

herein;

with

publication

technical and

changes

to

the

left

any

the

IBM

for

to:

IBM
Road,

Corporation,

information

of

such changes

SELECTRIC

reader's

System

with

corrections

or

additions

the

change.

717946

comments.

Communications

Kingston,

1972, 1973,

Technical

about

editorial

and earlier. Changes are

will

®Composer.

N.Y.,

Newsletter

fuses.

This

are made

corrections

to

the

be

reported

If

the

Division,

12401

1974,

1975'

infor-

to

text

form

the
are

and

in

has

Contents

Section

1.1

1.1.1

1.1.2

1.1.3

1.2

1.2.1

1.2.2

1.2.3

1.2.4

1.2.5

Section

2.1

2.1.1

2.1.2

2.1.3

2.1.3.1

2.1.3.2

2.1.3.3

2.1.3.4

2.1.4

2.1.5

2.2

Maintenance

1.
Introduction
Online/Offline

Field

Replaceable
Troubleshooting
Trouble
Obvious

Analysis

Symptoms
Isolation
Offline

Symptoms
Formatted
Customer-Reported

2.

Tools

and
Maintenance
Customer
Osci 1I0scope

Logic

Probes

Description

Probe

Usage

Probe

Checkout

Probe

Repair

Alignment

lOR

FE Test Card

Diagnostic Programs

to a Display

Diagnostic

Engineer

2.2.1 Test Patterns

2.2.2

2.2.2.1

2.2.2.2

2.2.3

Section

3.1

3.2

Section

Section

5.1

5.1.1

Requesting
Local Display
Remote
Online

Symptom

3.
Symptom I ndex
Developing

4.

Trouble!'hooting

5.

Checks,
Checks
Display

Display

Tests

Index

Adjustments,

Station

Pattern 1

5.1.2

Display

Station

(without

5.1.3

5.1.3.1

5.1.3.2

5.1.3.3

5.1.3.4

5.1.3.5

5.1.4

5.1.4.1

5.1.4.2

Voltage

Checks
low-Voltage
High·Voltage
Arc-Suppression Check

6.3V

AC

Check
High-Voltage
Keyboard
Voltages
Key

Module

Keyboards

5.1.4.3

5.1.4.4

5.1.4.5

5.2

5.2.1

5.2.1.1

5.2.1.2

5.2.1.3

5.2.1.4

5.2.1.5

5.2.1.6

Output

Codes

Shift

Key

Modules ­Spacebar Assembly Mechanical Checks
Adjustm
Display

ents

I mage
Brightness
Contrast
Focus
Yoke
Magnetic Centering Rings
Modell

Analog

Approach

1-1
1-1

Maintenance

Units

(FRU)

Aids

1-1
1-1
1-1
1-1
1-1

Station

1-1
1-2

Buffer

Tools

Symptoms

Failures

Programs

Tool

Kit

1-2
1-2

2-1
2-1
2-1
2·1
2-1

:2

~

2-1
2-1
2-3

Mask

2-3
2-3

2-3

2-3

RFT

Patterns

Stations

Stations

(Ol

Ts)

2-4
2-8
2-8
2-9

3-1

Usage

Symptoms

Diagrams

and Removals

3-1
3-1

4-1

5-1

5-1

Test Using Test 5.3.5.9

5-1

Test

Operational

Pattern

1)

Test

5-2
5-3

DC

Checks

Check

5-3

5-4
5-4

5-4

Power

Supply

Checks

Check

5·5
5-5
5-5

and

Encoding -Type

Only

Type A Keyboards

A

"

Only

5-5

5-6

5-6
5-6
5-6

Adjustments

5-6
5·7
5·7
5·7
5-7
5-7

Card

Adjustments

5-7

5.2.1.7

5.2.2

5.2.3

5.3

5.3.1

5.3.2

5.3.2.1

5.3.2.2

5.3.2.3

5.3.2.4

5.3.2.5

5.3.2.6

5.3.2.7

5.3.2.8

5.3.2.9

5.3.2.

Model 2 Analog

-12V
OFF-PUSH
Removals
Covers 5-9
Power
Low-Voltage

-12V
AC
Model 1 Prime

Model 2 Prime
Modell
Modell

Model 2 Ferro

Model 2 Ferro
High·

to

5.3.2.11 Fuses

~.3.3

5.3.3.1

5.3.3.2

5.3.3.3

5.3.3.4

5.3.3.5

5.3.3.6

5.3.3.7

5.3.4

5.3.4.1

5.3.4.2

5.3.5

5.3.5.1

5.3.5.2

5.3.5.3

5.3.5.4

5.3.5.5

5.3.5.6

5.3.5.7

5.3.5.8

Anaiog
CRT
Yoke
Modell
Model 2 Analog
Modell
Model
Power

Logic

Logic

logic

Keyboard

Keyboard

Keyboard

Keyboard
Audible
Keybutton
Type A Switch
Type

Keybutton

Keyboards

Type B Module

5.3.5.10

5.3.5.11

Type
Circuit

Type B Keyboards

5.3.6

5.3.7

5.3.8

5.3.9

Audible
Security
Selector
Operator

(Optional

5.4

5.4.1

5.4.2

5.4.3

5.4.4

5.4.5

5.4.6

5.4.7

5.4.8

Section

6.1
6,1.1

6.1.2

6.2

6.2.1

Type B Keyboard

Cleaning
Liquid
Key
Contamination
Protective
G rou nd Check

Ground

Crooked

6.

Reference
Controls
External
I

ntern:ll

I ndicatC' "
External I nd

Card

Regulator

Switch

Adjustments

Card 5-8

(Model 2 Only)

Components

Power

Regulator

Supply

Card

Capacitor

Power

Box

Power
Ferro
Ferro

Box
Transformer
Transformer
Transformer
Transformer

Vo lrage

Power

Supply

Components

and

Shields

Analog

Card
Card

Brightness and
2 Brightness and
Control

Switch

Components

Card

Board

Components
from

Display

Top

Cover

A~mbly

Feedback Assembly

A Spacebar Assemblies

Support

B Spacebar

Board

Alarm

Keylock
Light-Pen

Identification

Feature)

Spills

Modules

Membrane/Shield

Loop

or

Data

Controls

Cf'fltrols

Module

Only

and

(Optional

Shields

Isolation

loose

Icalo.

Electronics

(Optional

Maintenance

;,

from

Modules -Type

Only

(Optional

Key

A~mbly

(50-Hz)
(50-Hz)
(50-Hz)
(50-Hz)

Contrast
Contrast

Station

Bottom

Assembly

Feature)

Feature)

Feature)

Card Reader

Aids

tops

Controls
Controls

Pan

A

5-8

5-8
5-9

5-10
5-10
5-10
5-10
5-10
5-10

5-10
5-10

5-11

5-11
5-11
5-11

5-11

5-11
5-13
5-13
5-13
5-13
5-13
5-14
5-14
5-14

5-14
5-14
5-14

5-14

5-14
5-14
5-15
5-15
5-17'

5-17
5-18
5-20

­5·20
5-20
5-20
5-21

5-21
5-21
5-21
5-21
5-21
5-21
5-22
5-22
5-22
5-22

6-1
6-1

6-1

6-2
6-2
6-2

Contents

iii

6.2.2

6.2.3

6.3

6.3.1

6.3.2

6.4

6.4.1

6.4.2

6.5

Internal

Indicator
Arc-Suppression Neon
Keyboards

Types

of

EBCDIC

ASCII
ASCII

ASCII
Reference Diagrams

Keyboards

Keyboard
Options
Character Generators (Optional

Features)

Keyboards

(SWEEP

(Optional

(Optional

Feature)

Codes

INDIC)

Features) 6-4

6-3
6-3
6-3
6-3
6-3
6-3

6-3

64

Section

Section

8.1

8.2

8.2.1

8.2.2

8.2.3

8.2.4

8.2.5

Component

7.

I nstallation

8.
General
Installation
Line
Feature

Prepowe~-On

Power-On Checks 8-2
Hexadecimal Address Label 8-2

Locations

Instructions

Voltage Check 8·1

Installation

Checks

7-1

8-1
8·1
8·1

8·1
8·2

Diagrams

3277

1·1
2-1
2·2
2-3
24
2-5
2-6 Test Pattern 3
2·7
2-8

2·9
3-1
3·2
3·3
3-4 Test Pattern 3
3-5

3-6

3-7

3-8

3-9
3·10
3-11
3-12
3-13
3-14
3·15
3-16
3·17
3-18
3·19
3-20
3·21
3·22
3-23
4·1

5-1

5·2
5-3
54
5-5

5-6
5-7

5-8
5-9
5-10

Maintenance
Logic Probes
Alignment
Alignment
Test Pattern 1
T est Pattern 2

Test Pattern 5
Character Differences

WTC Languages
Test Pattern 10
Test Pattern 1, Model 1
Test Pattern 1,
Test Pattern 2 3·7

Yoke
Yoke
Centering Rings
Character
Glow
Single
Model 1 Raster
Model
Cursor
Box
No
No I nterrow
Correct 0 isplay
Out
Yoke
Open
1/2
Horizontal
Vertical
Display

(29

OFF-PUSH
Switch

Unsoldering Lead Frame
Lead Frame Removal

Switch

(Type

Switch
Torsion

Spacebar
Screw
Keyboard Assembly

Mask,
Mask,

Back

Too

Tilted

Height

Only

on

Horizontal

2 Raster

in

Every

in

Every Character Position

Horizontal

of

Focus I mage 3-9
Horizontal
in

Yoke

Vertical

Yoke

Yoke

Station

Sheets)

Module

Plunger

A)

Module

Bar Removal

Guide

Loosening

Approach

Model

1

Model

(USA

(USA

Model

CRT

Sync

Spacing 3-9

Horizontal

Yoke

Open 3-10

Switch

Removal

Return

Orientation

2

EBCDIC)

EBCDIC)

for

ASCII

Numbers

2

Far

on

CRT

Neck

Not

Adj

usted Properly 3-8

Too

Small

Line

on

CRT

Row

after

PO

R 3-9

Return

Line

Open

Winding

Open

Open

Troubleshooting

Adjustment

(Type
Terminals

(Type

A)

Spring

Positioning

(Type

(Type

A)

Module

Removal

(Type

B)

Separatio~

and

Di&grams

A)

(Type

A)

(Tyoe

(Typ".

A)

A)

HI

1·2
2·2
2·3
24
2-5
2-6
2-6
2·7

2-8
2-8
3-7
3-7

3-7
3-7
3-7

3-8

3-8

3-8
3-8
3-8
3-9
3-9
3-9

3-10
3·10
3·10
3·10

4-3
5-9
5·15
5-15
5-15

5-16
5·16
5-17

&17

E-l?

5~R

Index

Module

5·11
5·12

5-13
5·14

6·1
6-2
6-3
6-4
6·5

6-7
6=8

'6•

6·9
6-10
6-11
6·12

6-13

6-14

7-1
7-2
7-3

17-3.1

74
7·5

I 7·5.1

7-6 Model 2 Locations, Left-Side
7-7
7-8

7·9
7-10
7·11
7-12
7-13
7-14
7-15
7-16
7-17
7-18
7-19

8-1

f

;,)-1

Spacebar
External

Typewriter
Operator
Data
USA
WTC Language Keyboard Codes

6

ASCII
Logic
Probe Pin Data 6-12
Keyboard Feature Jumpers
Type
Board

Board

Board

Model 1 Locations,
Model
Model
Location
Model
Model
Location

Type
Type

Low-Voltage
Low-Voltage
Model 2 Voltage
Model
Brightness and Contrast
High-Voltage Power
Model
Analog Card (2
Type
Type
Type

50-Hz Ferro TB·1
Data

Removal

Circuit

Board and Electronics Assembly

(Type

B)

Base

Plate

Controls

Entry
EBCDIC

and WTC Language Keyboard Codes

Card Data (2 Sheets)

A Keyboard Encoding 6-13

Layout

Features (Card Side View)

Layout

Features (Card Side View)

Layout

(Pin Side

1 Locations, Left·Side
1 Locations, Rear

2 Locations,
2 Locations, Right-5ide

A Keyboard Locations
A Keyboard Pin Assembly and

Location

1 Prime Power

1 Arc-Suppression Board 7-14

B Keyboard Locations
B Keyboard Assembly
B Keyboard Assembly Pin and Terminal

Locations 7-19

F!ow

(Type

Ground

Pivot

Console Keyboard 6-5

of

of

Studs

Removal

and

Keyboard

Keyboards

Keyboard Codes (2 Sheets) 6-7

by

Card

by

Card

Pin

Identification

View)

Front

+5V

and

+34V

Front

+5V

and

+34V

Printed

Circuit

Printed

Circuit

Distribution

Box

Supply

Sheets)

(Foldout;

at

B)

(Type

B)

(Type

B)

Indicators

Function -Without

Function -With

Data

View

View

View

Fuses (Model 1) 7-4

View

View

Fuses (Model

View

Board
Board Shield 7-12

Board

Control

Terminals 7-13

back

of

manual)

2)

Terminal

. X-1

5-19

5·19
5·19
5-20

6-1
6-5

6-6

6-9
6-9
6-10

6-13

6-14

6·15

6-16
7-1
7-2
7-3

7·5
7-6
7·7
7-8
7·9

7·10
7·11

7-12
7·13

7·14

7-15
7-17
7·18

8-1
FO-1

iv

Abbreviations

AID
ALD
ASCII

CE
CK
CNCL
CPU
CRT
CU

CW

DEL
DUP duplicate

EBCDIC
EC
EOF

FE

Ferro

FRU

GLP

HV

lOR
INS MODE
I/O

attention
automated
American

Interchange

Customer Engineer
check
cancel
control
cathode-ray
control
control

delete

extended
engineering change
end

of

field

Field Engineering
ferro-resonant transformer
field replaceable

General Logic Probe

high voltage

identification reader
insert

mode

input/output

identification

logic diagram

Standard

processing

unit
word

binary-coded-decimal interchange code

tube

unit

unit

Code

for

Information

KB

LV

MDT

NL

PA
PC
PCBD
PF
POR

PS

SLT
SMS
SOR

TB
TCU
TEST REO
TP

VOM

keyboard

low voltage

mod ified data tag

new line

program access
printed circuit
printed circuit board
program function
power

on

power supply

solid logic technology
standard modu lar system
start

terminal board
transmission
test request
test

volt-ohmmeter

reset

of

record

pattern,

control

test

point

unit

Abbreviations

y

LEGEND

,

)

I:

<>

o

v

Terminal

Indicates beginning

Action

Indicates a major action. When

to

left of each action.

Annotation
Gives descriptive

Decision
Indicates a

is

pOSSible,

Probe
Indicates a

the

determilled

Car

d Chanqe

IndlCd(~

()+t

~f)dH,dtes

point

point

loqlc

probe. Pin

by

rhat card

Paqe Connector

connection

point

of

a Troubleshooting Diagram.

comment

in

a Troubleshooting Diagram

in a Troubleshooting Diagram

probe

or

or

is

specified in

result.

cards specified in symbol should

point

between

more

than

explanatory

the

symbol. Path

different

one

note.

sheets

action

is

described,

where

a branch

where

a logic pin should

to

be

be

of

the

bullet

symbols

to

alternate

followed

changed

Troubleshooting Diagrams.

and

data

paths

be

probed

after

probing is

new ones installed.

appear

with

o

7P

Uri

/)aqe Connector

Indicates

S',

t\.1

Millor

Data

Nlimber

Data Transfer
Identifies

Screwdriver

Switch

'!1t)C)1

I"

II

Bus

connection

points

Data

Path

Data Path

of

lines

data

between

to

correspondingly-numbered symbol (line-of·sight).

or

Control

on

bus

bits transferred

Adjustment

two

parts

Line

is

identified in circle.

to

or

from

of

the

same

sheet

a logic element.

or

diagram. Arrow leaving

vi

Section 1. Maintenance Approach

1.1 INTRODUCTION
Maintenance

repair and adjustment
attached features
can

be

of

attached

IBM

3277 Display Stations (including

of

Model 1 and Model 2 units) and

is

described

to

a 3277 include keyboards, a selector

in

this manual. Features

of

that

light-pen, and an operator identification card reader.

The objective

the failing

unit

of

display station maintenance

to

customer service as quickly as possible.

is

to

return

This manual guides the Customer Engineer through
procedures

enable him

to

adjust

or

replace a

that

malfunctioning component.

1.1.1

Online/Offline Maintenance

Display Station maintenance and testing can be performed
online

and/or

unit

offline when possible because
possibility
system. Unnecessary delays

offline. It

of

interaction with

is

better, however,

other

in

normal customer infor-

it

units

to

service

eliminates

of

the display

the
the

mation processing are thereby avoided. The maintenance
approach described
offline analysis first

this manual

to

resolve reported troubles.

is

structured

to

perform

in

1.1.2 Field Replaceable Units (FRU)
Component replacement

replaceable units (FRU). When

the

FRU

unit should be replaced immediately rather

is

limited
the

trouble

to

certain field-

is

isolated

to

than

an

repaired. The FRU parts replacement philosophy
practical because functionally packaged logic and densely

the

packed components are used throughout

display

station.

1.1.3 Troubleshooting Aids

Several tools are available

the Customer Engineer

to

to
simplify trouble analysis. The following paragraphs describe
these aids.

1.1.3.1 Symptom Index

The Symptom Index (Section
malfunctions

that

may be encountered on display stations.

3)

lists (by category)

The categories include such areas as display malfunctions,

power malfunctions, keyboard malfunctions, etc.

In

each
category, subcategories specify unique trouble areas. The
subcategories direct the Customer Engineer

to

an entry
the Troubleshooting Diagrams (Section 4), which contain
step-by-step isolation procedures.
Symptom

I ndex points directly

In some cases, the

to

a replaceable unit

causing the problem.

1.1.3.2 Troubleshooting Diagrams

The Customer Engineer

Diagrams from
procedures
adjustment.
observations
procedure.

the

to

isolate a failing F

The

diagrams call

that

shou

The

logic probe test device

is

directed

Symptom Index.

RU

out

Id

be made during

to

Troubleshooting

The

diagrams detail

or

an out-of-tolerance

specific checks

the

is

used

the diagrammed procedures.

1.

1.3.3 Diagnostic Programs

Two types

of

diagnostic programs may be available
Customer Engineer. Diagnostic program aids are described
in

Section 2

1.1.3.4 Customer Engineer Tool

Special tools are
Stations. The basic Customer Engineer
volt-ohmmeter, and

of

this

manual.

Kit

not

required

to

maintain

3277

tool

the

logic probe can successfully isolate
most display station problems. An oscilloscope may
required

in

some instances when

the

basic tools fail

resolve a problem.

1.2 TROUBLE ANAL
The sequence

performed

is

Diagram
used

1-1

to

isolate display station failures.

in

is

important
shows

VSIS

which display station trouble analysis

in

minimizing machine down-time.

the

five-step procedure

that

The

main points
the display station maintenance approach are summarized
below.

1.2.1 Obvious Symptoms
that

Obvious symptoms are those
operator or Customer Engineer action

that

Failures

could cause obvious symptoms

do not require any

to

bep>me evident.

include display image quality and positioning, mechanical
problems, and component breakage. These failures should
be

remedied by going directly

to

the Symptom Index

the appropriate adjustment or removal procedure

5.

Use

the

in

first entry

1.2.2

Isolation

If

an obvious symptom does

the cause

of

that

matches the failure.

to

a Display Station

not

the failure must

exist on a display station,

be

isolated between the

control unit and the display station. Sheet 1
Troubleshooting Diagrams describes

of

isolating the cause
connecting coaxial cable,

a failure

or

display station.

to

the

either

procedure for

the

and

diagnostic

in

many

of

to

the

Display

kit,

the

IBM

be

to

should be

of

to

occur

or

in

Section

of

the

control unit,

is

to

Maintenance

Approach

1-1

1.2.3 Offline Symptoms

Once it

is

determined

that

the

display station

is

the

cause

of
a failure, an offline symptom should be developed. A quick
offline

test

of

the

r---

.......

---or--------...---------..,

I.

~_.Ylie.s

.J'

____

,Obvious

focus,
physi col

'

Find

(Use

that

failure

first

matches

.. ~ Symptom

symptoms

tilt,

damage,

Index.
entry

include:

centering,

etc.

in

failure.)

That

3.2.
the

test

as soon as a symptom becomes evident, and match

the

symptom

the

first

Index tells

test should expose a repairable symptom.

entry

what

display station

with one listed in

that

matches

corrective action should be taken .

is

described

the

the

failure. The

Symptom

in

paragraph

Index.

Symptom

Stop

Use

2,

3.

4.

,-'

f

I

L

,':,>01-

persis

•

_____

...

_____

po

Yes

..

_____

,.. (Paragraph 5. 1 •

Yes

•

-----.~

...

.. ~ Use Troubleshooting

.. ~ Use keyboard

..

~Use

Sheet

Diagram,

(Paragraph

3.2).

failure

Find
Symptom

Index.

(Use

first

entry

that

matches foil

Test Pattern 1

Find

failure

Symptom

Index.

(Use first

entry

that

matches

Find

failure

Symptom Index .
(Use first

entry

that

matches

1.

check

in

ure.)

1).

in

failure.)

in

failure.)

1.2.4 Formatted Buffer Symptoms

If

an offline

symptom

does

not

become evident,

the

display station, including features, must be tested with

buffer formatted. The procedure described

5.1.1 should be used with Test Pattern 1
symptom.
evident, and match it
entry
what

Stop

the

test

as

soon as a

in

the

Symptom

that

matches

the

failure. The

corrective action should be taken.

Symptom

in

to

symptom

Index.

Use

paragraph

develop a

becomes

the

I ndex tells

1.2.5 Customer-Reported Failures

It may be necessary

failure if a

symptom
Test Pattern 1 using the procedures described
preceding paragraphs. Try
existed when

the
duplicated symptom
the

corrective action indicated.
matches the failure.
be duplicated, it must be assumed

error or an interm ittent failure

to

work with a customer-reported

cannot

be developed offline or with

in

to

duplicate the conditions

customer failure occurred. Match

in

the

Symptom

If

the

originally reported failure

that

Index and perform

Use

the

first

that

it was an

has failed

entry

operator

to

reappear.

cannot

entire

the

first

the

that

the

that

a>.·.:

'·2

·n

1·1.

3277

Malfltenance

Approach

This

section describes
aids used
hensive description
proper
station maintenance.

2.1

to

maintain

use

of

MAINTENANCE TOO LS

this

of

tool

the

the

tools

and programmed diagnostic

3277

Display Stations. A compre-

logic probe

is essential

is

included because

to

successful display

2.1.1 Customer Engineer Tool Kit

The

Customer Engineer

necessary

standard
voltage measurements. The meter's

20,000 ohms per
checking
when a check
using

referenced
return and frame ground are
display station

the

to

maintain

IBM

volt-ohmmeter

the

400V

of

VOM,

to

dc return rather than

is

not

tool

kit

contains all basic tools

IBM

3277

Display Stations. The

(VOM)

volt

causes

an erroneous reading when

dc power supply. This effect

that

power

supply

all

dc

voltage measurements should

at

connected

to a control

is

adequate

input

is

called

to

frame ground. DC

different

levels when the

unit.

for

impedance

is

noted

out.

When

all

be

2.1.2 Oscilloscope

I n some

an
equivalent, should
However, the

whenever possible, rather than

cases

of

trouble

oscilloscope. The

be

logic probe

analysis,

Tektronix

used

when

it

may be necessary

* model

is

an

453

an

oscilloscope

recommended

oscilloscope.

to

oscilloscope,

is

required.

for

use

use,

2.1.3 Logic Probes

Either

of

two

styles

of

logic probes

levels

while

signal

FE ALDs. The older-style probe (PN453652)
completely in
Diagram
shown in Diagram 2-18.

includes the G LP, standard accessories, and the General

Logic Probe Manual,

features
feature,
duplicated here,

Customer

ordering procedures should

*Trademark

2·1

of

the

and

A probe should

Engineers

of

using the Troubleshooting Diagrams

the

following

A.

The newer General Logic Probe

An

available GLP

SY27-0113. The manual describes the

GLP,

the

functions and

a checkout procedure.

so

the

user

is

referred

be

obtained

who

service

be

used

Tektronix,

Inc.

can

be

used

to

probe

is

described

paragraphs and shown in

(G

LP)

Kit

(PN 453212)

limitations

(That

information

to

SY27-0113.)

from

Mechanicsburg by all

3270

units. Normal tool-

to

obtain the probe.

of

each

is

not

Section 2. Tools and Diagnostic Programs

2.

1.3.

1 Description

2-1

A)

is

The logic probe (Diagram

of

an

consisting
green indicator incorporated near the probe end. A cable
containing
from

the

sealed
threaded stud
green indicators tell the state
three signal states
plus level, (2) a solid minus level, and (3) a pulse
presence
push-on connectors are attached

logic board being probed. They carry the operating voltage
(+5V dc

tip

of

carries the

2.1.3.2 Probe

To
threaded stud.
equivalent) should
probe are attached
probed. The
Connect the

+6V

to

or

lead

connected, the red

in the Troubleshooting Diagrams
The
probe:

1.

or

2.

is

3.

2.1.3.3 Probe Checkout
Note: This checkout procedure applies

logic probe

General Logic

panies the GLP.

and

screws

use

the logic probe, a probe

lead

to

the board

onto

Connect the oscilloscope probe

following

Red

indication

a.

Probe

b.

Plus signal on
Green indication - Ground (negative) signal on the
being probed.
Red

and

plus

and

condition

This
indicator pulsing on
seemingly on at the
frequency
seen.

anodized aluminum

two

wires and

top

is

at

that

of

pulses. The

ground)

on

the threaded stud

input

signals

Usage

An

leads

GND

any

D03

by

pushing

the designated pin. When the last wire

conditions can

not

attached

green

indication

ground)

can

of

the pulsing signal). Single pulses

(PN

453652). G

Probe Manual, SY27-0113, which accom-

SL

T-type

end

of

the

the

probe end

can

be

two

for

the

to

the indicators.

SL

T probe

be

used. The

to

the back

are

clearly labeled:

lead

to

any D08 pin, and connect the

pin

(+5V dc). The leads are connected

the

indicator

the

should light.

to

a pin

net being probed.

- A pulsing signal (alternately

is

present on

appear

and

same

a self-contained device

tube

with

push-on terminals leads

probe. A plastic

of

the device.

of

the

net

being probed. The

distinguished are: (1) a solid

wires

with

to

pins on the back

probe.

An

oscilloscope probe

at

the

tip

of

the probe. This

tip

must

be

attached

tip

(PN 453163,

two

wires at

of

the

logic board being

GND

connector

be

either

off,

LP

at

the end

tip

to

the pin designated

or

as

determined in logic.

observed

(floating

time

checkout

condition),

the

net being probed.

as

the red and the green

or

as

both

(depending on the

to

the Older-style
is

a red and

head

with

Red

or

the SL

T-type

of

to

the

top

of

and

of

by

the logic

indicators

can

also

described in

a

and

the

the

the

or

the

+6V.

each

is

or

net

be

Tools

and

Diagnostic Programs 2-1

Threaded

Tip

Cable

Red Green

A.

Tip

Older

Style

Probe

61

0

...J

0

Z

J:

U

W

.....

Q.

:>

~

0)

I11I1

~

t=

N

..J

:>

~

en

~

~

I

.-

~

~

Z

~

8

~

0)

J:

U

.....

«

...J

I 1II1 I

Q.

w

Z

:>

z

~

0

0

Z

0

I IIII I

~I

w

.....

«

<:J

>

~

+

Connect
003

0

>

Z

~

(!)

.,

pin

to

any

~@

.....

«

<:J

Push-Qn

Connectors

@

+

w

III

0

II:

Q.

u

e,:)

0

..J
..J

ct

II:

w

Z

W

e,:)

Z

.xl

.....

B.

IBM

General

Diagram 2·1.

2-2

Logic

Logic

Cable

Probe

Probes

Power must be applied

1.

Attach
453163

2.

Connect probe

3. Connect probe +6V lead wire
red indicator should light as soon as this wire

4. Touch probe
should remain lighted.

5.

Touch probe tip
should

008

6. Remove probe tip from
should light again.

2.1.3.4

The logic probe
experienced during probe checkout, check for
conditions:

1.

Power

2.

Probe leads are on

3. Proper pins are being probed.

If
operate correctly, obtain a new probe before trouble­shooting

2.1.4 Alignment Mask
Alignment masks are provided for both

models. The mask
ments. Diagram 2-2 illustrates

(PN
alignment mask
thin, clear plastic. Horizontal and vertical lines printed on
the
adjustments described

Each line

The mask

each edge are tucked under

probe
or

similar.

light and remain lighted

pin.

Probe Repair

is

applied

the

above conditions are met and

the

display station.

2577899), and Diagram 2-3 illustrates

mask serve

is

identified by an arrow and a letter designation.

is

centered against

to

the

3277

tip

to

probe. Use SL T probe tip

GN

0 lead wire

tip

to

any

003

to

any

008

008

is

not

field-repairable.

to

the

3277.

proper

source pins.

is

used during

the

(PN

2565170). The mask

as

boundaries when

in

Section 5 are being performed.

the

CRT bezel

during this procedure.

PN

to

any

008

pin.

to

any

003

pin. Probe's

is

attached.

pin. Probe's red indicator

pin. Probe's green indicator

as

long as probe

pin. Probe's red indicator

If

the

the

probe fails

display station

all

display image adjust-

Model 1 alignment mask

the

is

constructed

the

display image

the

CRT, and

to

keep

trouble

following

Model 2

the

tabs on

the

is

on

mask

in

position while adjusting

mask

is

not

being used, it should be

display station.

lOR FE Test Card

2.1.5
tool

(PN

This

test

card which
specifications
37-character

the

back of

on
precedes
check character
initiates
display station.
of

the

operator

are shipped with each card reader.

is

2.2

DIAGNOSTIC PROGRAMS

Diagnostic programs provide
tests to
Display

to

The programs reside

called

in

two

diagnostic programs
for Test (RFT) and
not

include OL Ts since this

Most

systems will have RFTs.
describe
in

to

the

2.2.1 Test Patterns

of

Six test patterns are included
patterns are used
Stations. Model 1 display
Model 2
4 and 6 are used by printers and are
EBCDIC, ASCII, and World Trade Corporation display
stations use these patterns. EBCDIC test
in

Diagrams 2-4 through 2-7. Some characters will differ
from those shown for
uses the ASCII code or a
those patterns are summarized

2143816)
conforms

in

respect

test

message

the

card. A start-of-record (SOR) character

the

message, and an end-of-card character

follow

the

read operation

The

card

identification card reader.

al

ign

and exercise

Stations

by

the

display station when R FTs

display

on both local and

the

display station when

Online Tests (OLT).

test

patterns and

to

stations

the

display image. When

stored

is

a magnetically encoded, plastic

to

American Banking Association

to

size, format,

is

encoded

the

message.

but

is

used

to

test

3277

in

the

host

CPU

that

apply

is

optional
The

the

in

troubleshoot

stations

use patterns 1, 3,

patterns

1 and 5 if

WTC

language. The differences
in

Diagram 2-8.

is

not

check

patterns and interactive

Model 1

to

methods

RFTs and OL Ts.

and align

use

and

on

the

magnetic stripe

The

SOR character

transferred

the

Two

remote

program and can

they

are required.

3277's

Some

to

following paragraphs

for

or

OL

Ts

patterns

and

not

described here.)

patterns

the

the

in

or

near

the

coding. A

and

a

to

the

performanct~

test cards

and

Model 2

control units.

be

The
are Requests
systems

the

calling them

are

3277

display

may

customer.

available.

Four

Display

1,

2,

and 5;

5. (patterns

are shown

station

for

~===

Diagram 2-2.

Alignment

[±]

=====

H

Mask. Model 1

2.2.1. 1
Test Pattern 1

the
The pattern contains

high-intensity

detectable fields.

Diagram 2-4

in
field
also tested by this pattern.

Test Pattern 1 (Diagram 2-4)

is

a functional test

display station.

is

the

illustration

is

in

the

All

protected

fields, nondisplay fields, and selector-pen-

The

not

displayed on

to

show

display buffer.

field marked "NON DISPLAY"

that

thoroughly checks

available characters are displayed.

data

fields, numeric fields,

in

the

screen

but

is

included

that

a programmed nondisplay

The

audible alarm feature

Tools

and

Diagnostic

Programs

2-3

is

t'

r-

0

'-

E

'-

Diagram 2-3.

B

J

F

Alignment

11

-1.

-

Mask, Model 2

N

9

M

-

-

480

1920

CHAR

CHAR

H

.........

K

L

G

2565170

-----.

--

./

Paragraph 5.1.1 describes
procedure
during

2.2.1.2 Test Pattern 2 (Diagram 2-5)

Test Pattern 2

described in paragraph 5.2.1.

displayed in normal intensity. The audible alarm (if

installed) sounds when this pattern appears on

22.1.3

Test Pattern 3
described in paragraph 5.2.1.
displayed in normal intensity. The audible alarm (if

installed) sounds when this pattern appears on

22.1.4

Test Pattern 5 loads
available uppercase and lowercase character codes. The

that

uses Test Pattern

the

execution of several Troubleshooting Diagrams.

is

used

to

Test Pattern 3 (Diagram 2-6)

is

used

Test Pattern 5 (Diagram 2-7)

the

the

comprehensive checkout

1.

This

pattern

align

the

Modell

All

data

to

align the Model 2 image

All

data

display station buffer with

is

also used

display image

is

protected and

the

is

protected and

the

as

screen.

as

screen.

all

audible alarm (if installed) sounds when this pattern

on

the

appears

2.2.2 Requesting RFT Patterns
RFT patterns can be requested for

attached
control unit (3271). Patterns can be requested from
display station
patterns,
BTAM
Access Method)
Basic Telecommunications Access Method), and
cation program must
system programmer can verify

request RFT patterns are met. The eight test patterns (four
EBCDIC and four ASCII)
and their identification numbers are listed

screen.

3277

Display Stations

to

a local control

to

be displayed

the

controlling

(Operating System Basic Telecommunications

or

DOS

be

unit

(3272)

on

another.

CPU

must be operating under

BTAM

set

(Disc Operating System

up

to

accept test requests.

that

the

that

can be requested by RFTs

or

to a remote

To

display

the

appli-

requirements

in

Diagram 2-9.

one

as

The

to

2-4

ABCDEFGHIJKLMNOPQRSTUVWXYZ

NON

DISPLAY

COpy

I Q # $ % ¢ &

COpy

?SEL

(Model 1 Patternl

ABOVE

~:

ABOVE

PEN

IN

( ) _ + ! ; f t < >? - =

IN

TEST

THIS LINE INSERT

I;

I /

01

2 3 4 5 6 7 8 9 ~ • - A

THIS LINE

> SEL

PEN

TEST

ADR-6G48

CK

(Model 2 Pattern)

Notes:

Diagram 2-4. Test Pattern 1

1.

AOR

NON

Use

- ctppears

OISPLA

Olawam

2.

3.

Y

2-8

only

Ie;

to

(USA

when

not

displayed

determlnP

EBCDIC)

patter')

unique

Ie;

called

chilrilctp.r

"'

Irr"n

()L

fEP

rr>p!.I(.;elr.~nts

wiWIl

A~";CII

vr

lllTe

1.1!)(ludges

.lrE'

u~ed

ToOls and Diagnostic Programs 2·5

EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE

H H
H H

H H
H H

,H

H
H

H

TEST

H *

0

00

DO

PATTERN

FOR

ALIGNMENT

UNPROTECTED

3275-1/3277-1

AREA

* H

H 0 ADR-6040 H

EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE

appears

only

when

pattern

IS

called

In

from

OL

Note'

AOR

TEP

c

H

H
H
H

Diagram

2·5.

Test Pattern 2

Not£!

Diagram

2·6

AOR

2·6.

dpf..H.'ars

(HliV

Test Pattern 3

when

pattern

IS c<Jlled

111

from

OL

TEP

ABCD~FGHI~«+I&JKLMNOPQR!);~

STU

V W x Y Z

~u

_ > ? :

~

~

, = ' , . $ * - / , G 1 2 34 5 6 7 8 9

ABCDEFGHIJKLMNOPQRSTUVWXYZG123456789
ABCDEFGHIJKLMNOPQRSTUVWXYZ8123456789

(Model

&-/

<;:.«+1

<;:.«+1

I"J/L
EOfVl

1

Pattern)

&-/

!$*);-,

!$*)j-'

,%

,~t=>?:#Qt="

CHECK55555
CHECK99

>?:n0'="

Note:

Diagram

I

Jse

27.

DlagrnJn

fest

28

to

deterrninf'

Pattern 5 (USA

unique

EBCDIC)

Lhdrdcter

repldU'n1t'nts

,,,,,'twn

A:,\::

I

l'

\",

T

~

1,!fHjlJd<WS

drt'

lJSPU,

Tools

dnd

Diagnostic

Programs

2-7

Hex Code/Graphic

Language 4A 5A 5B 78

-USA

EBCDIC
USA ASCII-A
USA ASCII-B
Austrian/German
Danish/Norwegian
Finnish/Swedish
Portuguese

Spanish

United Kingdom

t

[

r

0 U U

{lS

0

A

~

$

! $

)

)

l

1

C

!
!

$
$

1
1

~

p+

t.

#
#

#

A

4-

A

cr

N

#

7C

@

@

fit

ii

0

0

A

-

•

@

7F

"

..

"

A

4-

A

0'

N

"

4F

I
I

I

I

I

I

I

t

I

SF

-.,

--,

~

-.,

--,

-.,

.....,

-.,

-.,

-Belgian,

Diagram 2-8.

Test

1

2 (Model
3 (MocIe121
5

Diagram 2-9

2.2.2. 1 Local Display Stations

1. Position

2.

3. Press

4.

French,

and

Italian languages

Character

Pattern

1)

Test

the

of

an

unformatted

is

to

press
key.)
From

the

the

following

XXYYNCUU

where:

XX

YY

N

CUU

TEST

should

come

The

desired

INPUT INHIBITED

does

not

appear,

a.

Repeat
performed

Differences

EBCDIC

Pattern

cursor

the

CLEAR

keyboard,

format:

The

number
EBCDIC
Any

number
specifies
will be
The

number

com

ing

3272

The

three-digit hexadecimal
channel (C)
address

A/phabetic characters in the hexadecimal
number must

R EQ key. INPUT INHIBITED

on.

pattern

proceed

the

request

correctly.

10

Number

23
24
25
27

10

Numbers

at

the

top

screen. (One way

key

enter

of

column

from

the

number

repeated.

3. This identifies

from

a display

Control

Unit.

and

to

which

be entered

should

indicator

as follows:

while ensuring

use

for

ASCII

ASCII

29

30
31
33

left

and

the

RFT

the

test

of

Diagram 2-9.

01

the
the

appear

stays

t"p

USA

and

WTC L.nguages

(character

to

accomplish

then

press

request

pattern

to

99. This

of

times

station

display
pattern

in

uppercase.

within

on

and

that

eecotC

position

the

RESET

message

desired. Use

number

the

pattern

the

request

attached

number

15 seconds.

station

is

to

indicator

the

steps

of

be

pattern

1-3

character

0)

this

in

as

to

a

the

(UU)

sent.

If

are

set.

b.

Check
application

c.

Check
for
programmer

2.2.2.2 Remote Display Stations

1. Position
of

an

is

to

key.)

2.

From
the

that

that

online

the

cursor

unformatted

press

the

the

keyboard,

following

the

program

the

STAM
test
can

CLEAR

format:

operating

are still

requests.

provide

at

the

screen. (One

key

enter

XXYYNMMDD

where:

XX

YY

N

MMOD

The

number
appropriate
Any

number
specifies
witt be

:;

The
coming

3271

The
control

tOO)

(The release level of
bemg used
be
grammer

the

repeated.

number

from
Control
selection address

unit

to

which

entered.

for

of

column

4. This

determines

Check

this

system

executing.

application

(The

this

information.)

top

left

(character

way

and

then

the

RFT

the

test

of

.Diagram 2·9.

from

Ol

number

a display

Unit.

(MM)

of

identifies

and

the

pattern

the

with

information.!

and

the

program

customer's

to

accomplish this

press

the

request

pattern

to

station

what

desired. Use

99. This

times

the

the

attached

characters

the

display

is

to

operating

characters

the

customer

BTAM

is

set

_tern

position

RESET

message

number

pattern

request

of
station

be sent.

system

up

0)

in

~s

to

the

will

pro·

a

2-8

3.

Press TEST REQ key. INPUT INHIBITED indicator
should

come

on.

4.

The

desired

iNPUT INHIBITED indicator slays

does

not

a. Repeat

pattern

shoUld appear within

appear, proceed

the

request while ensuring

as

follows:

on

that

15

and

steps

seconds. If

the

1-3

performed correctiy.

b. Check

application program are

c. Check

for

that

the

operating system and

stili executing.

that

the

BTAM application program

online test reQuests. (The

the

is

customer's

programmer can provide this information.)

pattern

are

BTAM

set up

system

2.2.3 Online Tests (OL

Online tests may
aid

in

maintaining 3277 Display Stations. Detailed descrip-

tions and instructions
diagnostic program binder
unit. Control unit
Most

OL T routines apply

three routines

apply

1. KEY - This routine handles
rupts from

the
function keyboard. The
presented on
CE

of

the

success

Th

is

routine also reads back

keyboard

2.

MAG

to

check lowercase character codes.

- This routine tests

Ts)

be

available,

for

ML

TGs also

to

display stations:

at

the

customer's

using OL Ts are
that

is

shipped with each
contain

to

control units. The following

contained

this information.

manually generated inter-

keyboard, selector light-pen, and program

results

the

display station screen, informing

or

failure

the

of

of

the

data

operator

the

interrupt

entered

identification card

reader and identification cards.

3. PAT - This routine

paragraph 2.2.1.
the

CRT after
message containing instructions
pattern

sequence precedes Test

displays

The

they

are initially called in. An explanatory

'test

the

test patterns described

patterns

appear in sequence on

for

running

Pattern

1.

option,

in

to

the

control

interrupts are

the

operation.

from

the

in

the

test

Tools

and

Diagnostic

Programs

2-9

3.1

SYMPTOM INDEX USAGE

The

Symptom

encountered on

trations
images are

Index and illustrations as

method

Index lists

3277

that

show

also

contained

of

resolving display station problems.

trouble

Display

both

in

symptoms

Stations

correct and incorrect display

this section.

the

first step

that

could be

and features. Illus-

Use

the

Symptom

in

a systematic

The

index

divided into six major categories:

1. Display malfunctions.

2. Keyboard malfunctions.
Selector light-pen malfunctions.

3.

4. Power malfunctions.
CPU error indications.

5.

6. Operator identification card reader malfunctions.

Some categories are divided into subcategories, making it

easier

to

relate

the

trouble

in

the

index. Beginning

closely describes the display station trouble should

experienced

with

1A

1,

the

to

first

the

item

correct

that

be

item

most

used.

Categories and specific items are identified by a one-, two-,
or three-letter/number code (e.g., 1 A 1, 2G, or

of

the

column

into

the

Troubleshooting Diagrams

The right column of the

to take

index. The code specifies the

Symptom

to

remedy

the

display station problem.

in

Section 4.

I ndex specifies action

column directs the Customer Engineer
shooting diagram sheet
change. When more than

or

specifies a logic card (or cards)

one

card

is

4)

in

the

entry

to

a section trouble-

listed, isolate the

left

point

That

failing card by card swapping from among those specified.

the

others

to

Change the failing card and return

stock. The
right column may also specify an adjustment procedure
Section 5.

Diagrams 3-1 through 3-24 show both
incorrect display images.
illustrations
As an aid

to

aid in identifying display station symptoms.

to

rapid repair, diagrams

display images also specify

The

symptom

the

repair action.

correct

I ist refers

that

show incorrect

and some

to

these

Section 3. SYmptom Index

3.2 DEVELOPING SYMPTOMS

Display station malfunctions should be isolated offline
unless

the

trouble
through
type

the

control

are listed in Category 5 (CPU Error Indications).

Display station operations

is

for failure

1.

Selector light-pen operations.

symptoms

2. Display intensity

display).

3. Protected and numeric field operations.

4. Tab operations.

5. Erase input and erase field operations.

Test Pattern 1 contains fields

test

The
or

pattern may be loaded from

OL T.

Symptoms

marked with an asterisk

Offline

the

symptoms

following

removed.

1. Turn power on. (Always begin from a power-on reset
condition.)

2. Test cursor move keys

3. Test CLEAR key.

4. Enter four

to

5. Press Tab

6. Press Backspace

7.

Enter

four

8. Press Backspace

Enter

INS

four

in

9. Press

10.

11. Test DEL key.

Stop

the

when

the

first failure occurs.

occurs only when operating online

unit

to

the

host CPU. Failures

that

require a formatted buffer

to

become evident are:

control

that

(*)

(high intensity and non-

that

test

these operations.

the

system as an RFT

require a

in

the

formatted

Symptom

should be developed by performing

tl..'5t

sequence after

or

five characters.

(~)

key.

(+-) four times.

--+,

t,

..t.,

+-, ~ ,

the

I/O signal cable

~,

characters.

(+-) four times.

MODE.

or

five characters.

test sequence and go to

the

Symptom

Index.

+-'

of

buffer are

•

Index

this

is

Symptom

Index

3-1

SYMPTOM

INDEX

Symptom

Note: Bad

failures ranging
checker

1.

DISPLAY

A.

B.

or

mIssing green

from

PN

9900453.

MALFUNCTIONS

No

Display:

1.

No

visible

characters,

Glow

2.

Intensity and Focus:

One

1.

2.

3. Block displayed

horizontal
Modell
Model 2 ­ten

scan

a.

INPUT

INPUT

b.

I 4. Display

effect

5. Characters

*6. Dual-intensity problems

7.

Display erratic (e.g., display flashes, characters move, more than one cursor)

I

8. Screen

9. Retrace unblanked

10. Random data on screen. INPUT

11. Cursor on
One

12.

dot

wire

grounds on display stations

intermittent

light

or

indicators displayed.)

only

on CRT (Diag 3-9)

line on

- Full raster on screen (Diag 3-11)
24

rows

lines) (Diag 3-12)

INHIBITED

INHIBITED

too

dim

usi

ng

display focus

out

of

full

of

lines

left

side

at character location zero cursor

to

catastrophic.

or

glow on CRT. (Device Check

CRT

(Diag 3-10)

of

nine

scan

lines

..................

in

every character

lighted

not

or

too

bright (No

control).

focus (Diag 3-18)

or

characters displayed

.............

.............

in all rows . . . . . . . . .

position;

................

lighted

control

INHIBITED

or

Verify

proper grounding

not

................

OR

with

space

between

cursor normal (Diag 3-14).

..............

of

intensity),

that

should

.
.

lighted

position

control

indicated;

each

or

dim

not

units can

by

row

and blurred (no

cause

using ground

no

cursor,

(one

row

.

.
.

Diagram Sheet
Direct

Action

Sheet 2
Sheet 4

Sheet 4

.

of

Sheet 5

Change card J2.
Change card

Sheet 5
Sheet 5
Sheet 6

Sheet 6

Sheet 6
Change cards H2, J2, K2.
Change card H
Change card H2.
Change card J2.

K2.

or

Repair

2.

C.

Display Position and Size:

Horizontal

1.
Vertical size

2.

Both

No

space

3.

•

Requ

ires a

formatted

3-2

size

too

horizontal

between rows

buffer.

too

large

or

too

large

or

too

and vertical size

of

characters (Model 2

small (vertical normal) OR

small (horizontal normal, Diag 3-8)

too

large

or

too

small

only)

(Diag 3-16) . . . . .

..

Adjust

analog card.

of

range

of
change analog card and
card J2.

If

less

than

direction, adjust analog

If

card.
if
change
supply.

Sheet 7

more than

display size erratic,

HV

If

adjustment,

1"

in either

1",

power

out

or

Symptom

1.

DISPLAY MALFUNCTIONS (Cont)

C.

Display Position and Size: (Cont)

4. Rows

5. Display

of

characters

not

centered (Diag 3-7)

not

6. Display tilted (Diag 3-6) . . .

D.

Dlaracters:

1. No characters displayed,

problem only.) . . . . . . . . . . . . . . . . . . . . . . . . . .

0 isplay

2.

than one cursor

3. Character(s)

4.

Screen full

a. Quote mark

out

of sync. (Characters may be recognizable

is

seen. INPUT INHIBITED

not

formed correctly wherever displayed

of

quote

in

location 0 and cursor in location 1 after

5. Wrong character displayed from program, keyboard,
a. Without Device Check

b. With Device Check . . . . . . . . . . . . . . . . .

6.

Data displayed
Screen full

7.

8.

Screen slowly fills with character

INHIBITED

that

should

of

one character with

not

lighted

9. Attribute characters displayed

SYMPTOM

INDEX

(Cont)

Diagram Sheet or

Direct Action Repair

evenly spaced

Change analog card
See centering procedure

(5.2.1.5).

See

yoke

adjustment

procedure (5.2.1.4)

but

cursor displayed. (See Symptom 2B4 if keyboard

..

Sheet 7

but

are moving, and more

not

lighted.) (Diag 3-15) Sheet 6

on

screen Change card K2.

marks (no Device Check) . . . . . . . . Change cards A2, K2.

POR

Replug connector inside

keyboard.

or

POR:

Change card K2.
Sheet 7

not

............

or

without

of

INPUT INHIBITED lighted

last keyboard key pressed. INPUT

.

Sheet 8
Sheet 8

Change card A2.
Sheet 8

E.

Cursor:

1.

No cursor on screen,
No

cursor with INPUT INHIBITED lighted. Cursor cannot

2.
by

Power

Cursor appears normally. INPUT INHIBITED lighted

3.

4. Cursor under
INHIBITED

5.

Cursor under all character positions,

6. Cursor

7.

Cursor

No

8.

cursor, and INPUT INHIBITED
character enters until
character.

9.

Screen slowly fills with cursors . . . . . . . . . . . . . . . . . . . . .

10. Cursor appears
PORe

may blink

No

11.

cursor on screen after

each row displays

but

rest

of

On

Reset

or

CLEAR key

display normal (no Device Check)

be

..................

.....

returned

...........

all

or

most character positions, and Device Check indicated (INPUT

lighted) (Diag 3-13)

not

positioned correctly under a character; may be in character area

too

long

or

too

short

80

characters

...................

but

Device Check

not

indicated (Diag 3-13) .

. . . . . . . . . . . . . . . . . . . .

not

on. Partial cursor appears as each

in

row appear with partial cursor under each

Occurs on one row at a time . . . . . . . . . . . . . . . . . .

in

Characters

three or four rows equally spaced

mayor

may

not

enter and appear at cursor location. Display

on

left side

of

display after

.............................

PORe

Characters may enter,

as

character enters. (INPUT INHIBITED

but

only first scan

not

lighted)

to

screen

1ine

of

.

Change card

.

Sheet 9

.

Sheet 9

.

Sheet

K2.

10
Change card K2.
Change card
Change card

K2.
K2.

Change card J2.
Change cards A2, C2, H2.

.

Sheet 10

Change

card

Symtom

J2.

Index

3-3

SYNIPTOM

INDEX

(Cont)

Symptom

1.

DISPLAY MALFUNCTIONS (Cont)

F. Indicators:

1.

No indicators light. (Characters and cursor normal.)

*2. One indicator fails to light . . . . .

One indicator lit when it should

*3.

2.

KEYBOARD MALFUNCTIONS

Note:

If

card reader feature

at

feature logic card

If

keyboard operates correctly with card removed and cable swapped, change card N2,

location N2, and move keyboard cable from socket Z4

and return keyboard cable
cable swapped, select symptom

A.

All

Keys

is

installed on failing display station, remove card reader

to

socket Z4.

that

not

be

.....

If

keyboard still fails with card removed and

best describes failure.

.

to

1. Keyboard inoperative . . . . . . . . . . . . . . . . . . . . . . .

2. Keyboard operation erratic (INPUT

3. Diagonal row of

INPUT INHIBITED not lighted

enter.

dots

appears starting

INHIBITED

at

..

on

after certain keys.) Sheet 12

lower left corner of screen as characters

. . . . . . . . . . . . . .

socket Z1.

..

..

Diagram Sheet

or

Direct Action Repair

11

Sheet
Sheet

11

Sheet 9

Sheet 12

Change card J2.

B.

Character Keys:

one

1. Wrong character for

key

2. Wrong character for more than one key
No

characters

3.

*3a. Correct character enters,

No

character enters for all keys; cursor advances with each key depression. Dots

4.
may appear
Alpha characters enter into "numeric

*5.

numeric lock feature

on

enter

for all keys .

but

one

line. (INPUT INHIBITED indicator does

is

installed. See

*6. Numeric characters cannot enter

7. Typamatic failures

...............

8. Cursor disappears when character enters
Cl)aracters entered

9.
INHIBITED

not

not

lighted.)

displayed. Cursor move keys work correctly. (INPUT

..

..............

INPUT INHIBITED lights for one or more keys

not

light.)

only"

Diag

in

"numeric

fields. (Verify

6-10.) . . . .

only"

fields

that

keyboard

.

....

. . . . . . . . .

...................

keyboard

See

check

procedure 5.1.4.

Sheet 12

.

Sheet 13
Sheet 7

Sheet 13

Sheet 13
Change card
See

B2.

keyboard

check

procedure 5.1.4.

Sheet 14

Change cards A2,

B2.

G2.

• Requires a

formatted

buffer.

SYMPTOM INDEX (Cont)

Symptom

2. KEYBOARD MALFUNCTIONS (Cont)

C.

Cursor Control Key Failures:

1.

Failure

of

any

or

all cursor move keys:

2. Data moves

to

left when +-key pressed . . . . . . . .

D. Operator Function Key Failures:

*1.

ERASE FIELD

*2. ERASE INPUT

INS

3.

3a.

MODE

INPUT INHIBITED lights when

.....

......

.
.

4. DEL

5.

RESET

......

.

E. Program Access Key Failures:

1.

CLEAR

2. ENTER,

......

PAl,

PA2, PA3, TEST REO,

.

F. Keyboard Assembly

1.

Keyboard Mechanical Failures (includes audible feedback) .

2. Keyboard

Electrical Failures . . . . . . . . . . . . .

~

J.

c~rsor

moves from last

or

PFl-12

t......

-+t

+-

IE-

to

first character position

Diagram

Sheet

or

Direct Action Repair

Sheet

14

Change cards C2, H2.

Sheet

18

Sheet

18

Sheet

18
Change card
Sheet
Sheet

Sheet
Sheet

Sheet

J2.
19
19

20
20

20

Sheet 21

G. Audible Alarm Failures:

1.

Fails

to

sound

2. Sounds when it should

3.

SELECTOR LIGHT-PEN MALFUNCTIONS

A. Nothing happens when tip switch closed

*

*B. Lines appear and remain through

not

all detectable characters with

detect

*C. Lines always appear through all detectable characters, even when pen

*0.

Data

not

entered when selector light-pen initiates

1.

INPUT INHIBITED
INPUT INHIBITED lights

2.

does

not

light

..............

entry

into system:

.

*E. Selector light-pen action changes verification characters correctly,

INHIBITED lights

*

Requires a formatted

buffer.

...........................

attempted

not

used

but

INPUT

Sheet 21
Change cards G2, H2.

Sheet

22

Sheet

22

Sheet

22

Change card
Change cards G2,

Change card

.

M2.

M2.

02.

Symptom

Index

3-6

SYMPTOM INDEX

(Cond

Symptom

4. POWER

5.

CPU

Note: (Device

condition.

A.

B.

C.

D.

E.

MALFUNCTION

ERROR

Device

Operator

Display

Control
characters

Error

1.

2.

INDICATIONS

)

not

cannot

station

unit

may

Printouts

Device

Device

available

Checks
Checks

*3. Device Checks (parity)

4.

Transmit

check

always

cannot

appear

Checks

is

indicated

use

attention-generating

appears

write
after

(no cursor)
(too

CLEAR

many

busy

to,

cursors)

by

INPUT INHIBITED light

keys

and/or

selector

to

or

control

read
key

unit

from,

display

operation.)

on

due

light-pen successfully

station

correctly.

to

an

(Random

error

Diagram
Direct

Action

Sheet

23

Sheet

26

Sheet

26

Sheet

26

Change

Sheet

9

Sheet

10

Sheet

7

Sheet

27

Sheet

cards

or

Repair

G2, H2,

J2.

F. Read Modified (MDT

1.

Selector

2.

Selector

3.

Keyboard

G.

Programmed

H.

Keyboard

I. Program erase

6.

OPERATOR

A. Cards

B.

Incorrect

c.

Cursor

*

Requires a formatted

pen
pen

audible

remains

IDENTIFICATION

do

not

feed

number

does

not

changes
fails

fails

to

disabled

of

unprotected

through

of

characters

move

buffer

bit)

to

set

set

alarm

as

card

Failure:

designator

MDT,

MDT .

failure

after

program

data

CARD

reader

read

feeds

character

and

unsuccessful; erase

READER

through

correctly,

INPUT INHIBITED

attempt

to

MALFUNCTIONS

reader

but

enable

from

INPUT INHIBITED lights Change

does

not

light Change

Change

Sheet

it

keyboard

successful

Change

Change

Sheet

Sheet

Sheet

card
card
cards

21

card

card

27

27

28

02.

M2.

A2,

G2.

G2.

C2.

3-6

See Diagram

2-4

for

greater detail

of

the

test

pattern

data.

See Diagram

2-4

for

greater

detail

of

the

test

pattern

data.

Diagram

See Diagram

Diagram

3-1.

3-3.

Test

Pattern

2-5

for

Test

Pattern

Model 1
(Adjust

1,

Model 1

greater detail

2

malfunction

yoke,

5.2.1.4.)

of

the

test

produces

pattern

data.

similar results.

Diagram

See Diagram

Diagram

3-2.

3-4.

Test

Pattern

2-6

for greater detail

Test

Pattern

Model 1
(Adjust

yoke,

1, Model 2

3

malfunction

5.2.1.4.)

of

the

test

produces

pattern

data.

similar results.

Diagram

3-5.

Yoke

Back

Too

Far

on

CRT

Neck

Diagram

3-6.

Yoke

Tilted

Symptom Index 3-7

Model 1 malfunction
(Adjust

centering rings, 5.2.1.5.)

produces

similar

results.

Model 1 malfunction
(Adjust

analog card.

Mod€1

2,5.2.1.7.)

produces

Model

similar

1,

5.2.1.6,

results.

Diagram

Diagram

3-7.

3-9.

Centering

(Troubleshoot

Glow

Only

Rings

Not

on

CRT

(Troubleshoot

Adjusted

on

Diag 4-1, Sh

on

Diag 4-1, Sh 5,

Properly

4,

1

A2.)

182.)

Diagram

Diagram

3-8.

3-10.

Character

(Troubleshoot

Single

Horizontal

(Troubleshoot

Height

Too

line

Small

on

Diag4-1,Sh

on

CRT

on

Diag 4-1, Sh

4,

181.)

5,182,)

Diagram

3-8

3-11.

Model 1 Raster

Diagram

3-12.

Model 2

Raster

Model 1

malfunction

(Troubleshoot

INPUT

INHIBITED

K2')

card

produces similar results.

on

Diag 4-1, Sh

is

on.

Ifioft

10,

1E4

change

if

Model 1
(Change card

Change

malfunction

J2

if

card

K2

if

produces similar results.

INPUT

INHIBITED

off.)

is on.

Diagram

Diagram

3-13.

Cursor in Every

Model 1
The

number

.[Troubleshoot

3-15.

No

malfunction

density

of

each

of

characters

on

Horizontal

Model 1 display is

Sync

Row

produces similar results.

row

is determined

in

that

4-1,

row.

Sh

same

6102.)

except

Diag

by

for

the

size.

Diagram

Diagram

3-14.

Box in Every

This

failure applies

(Troubleshoot

3-16.

No

Interrow

Model 2
(Troubleshoot on Diag 4-1,

malfunction

Character

Position

to

Model 2 displays

on

Diag 4-1, Sh 7, 1 C3.)

Spacing

produces similar results.

Sh

only.

5, 1 B5.)

Diagram 3-17.

Correct

Display

after

POR

Diagram

3-18.

Out

of

Focus

I "lage

Symptom

Index

3-9

Model 1 malfunction
The

density

of

determined

bv

the
the

produces

superimposed

number

of

characters

similar

characters

results.

in

the

is

row.

Model 1 malfunction

produces

similar

results.

Diagram

Diagram

3-19.

Yoke

Model 1 malfunction

3-21.

1/2

Model 1 malfunction

The

Horizontal

Vertical

pattern

Return

Yoke

Open

displayed

Line

produces

t

produces

is

data

Open

t

similar

results.

similar

dependent.

results.

Diagram

Diagram

3-20.

Open

in

Yoke

Model 1 malfunction
The

vertical

bar

3-22.

Horizontal

Horizontal

produces

appears

Yoke

in

every

Open

Winding

similar

row

t

results.

that

t

has

data.

Diagram

3-10

3-23.

Vertical

Yoke

Open

t

t

Connector
Check
and /

or

P1

yoke

P1

before

do

loose

changing

not

on

analog card can cause

yoke.

change

repair

the

problem.

similar

analog

card

symptom.
if

connector

Section 4. Troubleshooting Diagrams

I The Troubleshooting Diagrams (29 sheets)

be

used

as

should

3). The diagrams are flowcharts arranged in a sequence
ensures successful trouble resolution
The steps
because successive steps depend on
obtained
seem
discouraged to avoid unnecessary duplication

prolonged service

Sheet
caused by a display station problem or by a control
problem. Subsequent flowcharts cover display, keyboard,

selector pen, and card reader malfunctions. Additional
sheets analyze power troubles and miscellaneous keyboard

assembly

Observe good safety habits
station with power on.
anode,

voltage distribution points. Always remove power from the

display station when removing
avoids damaging circuitry
feeding it.

The flowcharts use
"change card XX". "Replace" means to reinstall the same
card
new card from stock. The
probable cause of the failure.

Two unique symbols are used
symbol

means
in

the symbol. Seven logic probe conditions can be seen
with
from the probe symbol specifies one
ditions.
specified
flowchart.

specified

"Other".
the flowcharts and their definitions are

1.

Red

2.

Green - solid green.

Red

3.

blink.

in

in

illogical and shortcuts may seem apparent, deviation

1 determines whether

electrical and mechanical troubles.

the

that

was earl

to

probe (with

the

older style probe

If

in

result, use

The seven logic probe observations specified

- solid red.

Blink - solid green with one (and only one) red

directed by

the

flowcharts must be followed

preceding steps. Although

calls.

yoke assembly,

ier

removed; "change" means

the

the observed condition

the

flowchart, continue down

If

the observed result

the

the

Symptom I ndex (Section

the

the

symptom experienced

while working on

High

voltage

the

HV

power supply, and

or

replacing logic cards. This

on

that

the

terms "replace card XX" and

old card being changed

in

logic probe) the point designated

(PN

453652).

is

part

of

the flowchart labeled

in

this section

in

a minimum time.

in

sequence

actions and resu Its

the

sequence may

of

effort and

the

display

is

present at

card

the flowcharts. The

of

is

the

different from the

as

follows:

the

or

other

cards

to

install a

is

An

output

the seven con-

same

as

that

part

of

CRT

that

is

is

unit

the

the

line

that

the

in

4. Green Blink - solid red with one (and only one) green
blink.

5. Pulsing Red - solid green with

of

pulses

as

frequency
stay on.)

6. Pulsing Green -

of

frequency
stay on.)

7.

Red and Green - approximately equal red and green
pulses (any frequency).

The same conditions can be observed using the new G

(General Logic Probe),

older-style logic probe

red

to

indicate a plus
indicate a minus level. This difference must be kept
when troubleshooting with

in

this manual were designed for use with the

logic probe. ' ,

The card-shaped symbol

appearing
location
problem.

1. Turn power off.

2.

3. Turn power on.

4. Verify

5.

6. Return display station

the
specified. Change
stock.
problem, check
these card locations.
voltages and voltage pins.

removal procedures. Because
utility
Section 5. Flowchart references
as
Section 5 where

of

It

Change card (5).

that

Replace covers.

When

more than one card

failing card by card-swapping from among those

If

changing

The flowcharts

as

three-

or

pulses

at

the

end

the

card(s)

also means

trouble

the

all voltages

standalone procedures, they are contained

four-digit numbers, indicating

the

long as green indicator appears

solid red with regular green pulses. (Any

as

long as red indicator appears

PN

453212. The difference from

is

that

level

and

of

a diagnostic sequence gives

to

be replaced

to

take

is

repaired.

to

failing card, and return the others

the

specified cards does not repair the

Use

call

out

procedures are found.

regular red pulses. (Any

to

LP

the

the G LP

DOWN

the

GLP because the flowcharts

the

user.

is

listed

on

the

Diagram 6-14

certain check, adjustment, and

uses

UP

in

place of

in place

that

following action:

in

the

A 1 board backpanel

of

their length and their

to

these procedures appear

of

green

ol~r-style

will

repair

symbol, isolate

to

identify

the

paragraphs

in

to

mind

the
the

to

the

to

at

in

In

Troubleshooting

Diagrams 4-1

Check
properly before beginning
Basic cards
Model 2 basic cards

I should also

shows logic board card plugging

that

all

basic

for

Model 1 display stations

are

be

installed and seated properly. Diagram 6-12

cards

are

installed

the

troubleshooting procedure.

C-K. Applicable feature cards

for

display stations

are

C-E

and

and

with

seated

G-K.

features (1/2 board); Diagram 6-13 shows card plugging

. display stations

The

logic probe

isolate failing cards. Ensure
correctly before troubleshooting.
paragraph 2.1.3.3

no

that

have features installed (2/3 board).

is

used

extensively in this section

that

the logic probe

Use

to

check

out

the probe.

for

to

is

operating

the procedure in

4-2

I

Example
not requi

1.

CLEAR

to Null

2.

CUf'IOr

3.

Image

4.

Image

of _ openItionr
..

CU:

key

does

not

••

PCIIitl_lng keys.

quality.

.iz

•.

clear

that do

buffer

Display station
troubl.

SWop

coo>ciai

betw

..

n the

stations.

reportee!.

cabl.,

two

di'pl

No

Trouble

is

probably in

display

stotion.

If

verlfic:otlon

pnlYe

trouble
stotion,
described

Yes

No

Assume
displ

ay

Symptom Index and

Troubleshooting Diagrams

to

resolve problem.

ay

further

is

required

is

in

display

perform operotions

at

left.

that

trouble is in

station.

Use

to

Dia

..... m 4-1. Display Station Troubleshooting Diagrams (Sheet 1

of

Yes

No

No

29)

Originol

probably

ccable

connection
intermittent
that

cannot

at

this tim

failur.

was

a loose cooxial

Or

on

problem

be

resolved

•.

Troublelhooting DWgrams 4-3

1A1

•

Pr

i mary power

plugged

• Power switch turned
on (Pull).

• Turn

to maximum (full

clockwise).

Bri

in.

ghtness

cord

contra

I

Yes

• Turn power

•

Open

e

Check
poor

A-AIZ3.

e Check for loose

connector
card.

(5.3.1).

connector

off

side

covers

for loose or

on

•

ot

anaiog

• T urn power

• Remove

•

• Turn Brightness control

• Press

• Turn Brightness control

off

feature

A2, 82, M2. N?
T urn power

on.

to minimum (fully

counterel

ockwise).

and

hold INTEN

CRT

switch.

toward maximum.

.

card(s).

•

•

Compare
Diags
Release

switch.

3-19

INTEN

No

display

to

3-23.

CRT

with

Yes

Sheet

Yes

• Turn

4

•

•

• Power on ond

Replace

A2,

82,

Change

(Mod

Mod

2,

(5.2:

power

feature

analog

I,

5.3.3.4).

I).

off.

M2,

N2.

5.3.3.3;

adjust

card(s)

cord

Sheet

3

• T urn power off •
Change

analog

1,

2,

5.3.3.4).

5.3.3.3;

and

adjust

card

Sheet

4

•
(Mod

Mod

• Power on

(5.2.1).

Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 2

of

29)

• Turn

pawer

•

Replace

feature

A2, 82, M2, N2.

•

Chonge

analog

(Mod

1,

5.3.3.3

Mod

2,

5.3.3.4).

• Power on

(5.2.

and

n.

off.

card(s)

card

adjust

Yes

•

Tu"'"

pawer

•

Change

yoke

• Adjust

(5.2.1).

• Replace

A2, 82, M2, N2.

•

U~

check

(5.1.2)

to

functions

off.

(5.3.3.2).

feature

procedure
verify

are

card(s)

all

normal.

Sheet

~

e Chonge fUM.
e

Turn

power

on.

Yes

e Remove

CRT

cone

shield
e Connect
e Turn power

socket and

(5.3.3.2).

CRT

on.

socket.

No

Check cables from

board

to

C/TB I ond

PC

board

from
fefTO

to

~onsformer.

No

e

Repoirfoult.

e Check

out

unit

for

pc-oper

operotion.

Sheet

~

e

Turn

power

CRT

cone shield

CRT

off.

sock.t

(5.3.3.2).

ond

e

Remove

e Connect

socket.

No

Yes

PC

e

Turn

power

Yes

Chonge vol toge
distribution board
!Diog.

7-6\.

CRT

CRT

I,

5.3.2.6,

5.3.2.7;

2,5.3.2.8,

5.3.2.9).

oH.

socket.

'4.

e Remove
e Measure resistance

between

pins I ond

Chonge ferro transforMer

(Mod

Mod

e

Tum

power aH.

e Remove
e Measure r

between
piN

I ond 14.

Check cobl
CRT

,ocket

or broken

CRT

socket.

..

istance

CRT

..

ond

for

l_

connections.

e

Turn power
e Reploce
e Chonge onalog cord

Mod

e Power

(Mod

2,

(5.2.1).

off.

cone

shield.

I,

5.3.3.3;

5.3.3.~).

on

ond odJust

Diagram 4-1. Display

Station

Troubleshooting

Diagrams

(Sheet 3 of

29)

Troubleshooting Di8gqms 4-6

• Tum

power

• Remove

cover.

• Remove

A2, 82, M2,

• Turn

power

off.

right

feature

on

side

N2.

.

cordis)

Sheet 2 Sheet 2

Meaoure

following

voltage

at

PS2)

,.~

return, (Oiag

HVPS

(011/

10

7-14).

Remove

push-on connec:tar

Ifroln

supply

pin 3 (IN)

1

___

de

voltage

connector on wi

• Change analog ecwd.

(Mod

I,

Mod

2,

•

Power

on

(5.2.1).

at

...

5.3.3.3

5.3.3.-4) .

and

odj

and

..

t

Yes

• Turn

po_r

feoture

82,

M2,

1,5.3.3.3

2,5.3.3

off.

N2.

.•

cordh)

)

• Reploce

A2,

• Change analog cord

(Mod
Mod

• Power on and odjus

(5.2.1).

Meaoure

following

voltages

with

YOM

15Y

scale.

negotive

return.

t

Measure

voltage
board terminol

(Oiog

7-11)

distribution

•

Verify

Reference

leod to

de

voltage

distribution

11.

boord .

repoir.

on

on

Me

......

e

voltage

orc-wppression

terminol E8. (Oiag

7-\5)

on

board

S

.....

3

~m

4-1. Dispbtv

Stftion

Troubleshooting

Diegrems

(ShMt

4 of

29)

• Remove

•

Adjvst

Contro'

ILlpp',5

left

Focus

0""

2.:

H V

cover.

using

JX)wer

3,

rocus

• Turn

• Change

Mod

Mod

• Power

(5.2.1

power

off

analog

1,5.3.3.3

2,

5.3.3.4

on

and

).

.

cord

adjust

Check
while

control
mini

....

um.

voltoge

turning

from

maximum

(Oiog

at

BIAI

Brightne

7-12)

..

to

P3-2

(~.

• Turn

• TUln

brig

clockwise

contrast

•

mwcin'1um

maxirnufT'

CheCk

vo"oge

....,~ile

tur~in9

control

f

..

o,.... ",0)(1"...:,.

Q'

B.

ight"'lE!''!t5

Yes

Checlo

vol'age

at

'''pply pic

whl

..

0d,u.'ing

iometer

eo·

oft

H

'.

IX>weo

10

r

H\

I.

'juDP!

•

y

power
CheCk

~

OCuS

potent

Diog 7-14)

;,

....

f)O

......

•

C~onge

) 3 2

•

'.;~rj~y

C

k2B

......

to

fi.

Diagram 4-1. Display

Station

• Turn

power

off •

Change

control

•

(5.3.3.5).

•

Verify

repair.

Troublnhooting

•

Turn

power

•

Model

1 -

Change

suppression

•

Model

2 -

Change

distribution

•

Verily

repair.

• T urn

power

•

Change

(Moo

Mod

2,5.3.3.4)

• Power

(5.2.1).

Diagrams (Sheet 5

off.

board.

boord.

analog

I,

5.3.3.3.

On

of

ono

orc-

(Diog

VOltage

(Dioq

off

odivst

29)

.

cord

7-3).

7-61.

•

Turn

power

•

Change

5.3.3.61.

•

Verdy repair.

con'rol

off.

Troubfnhooting

Diagrams 4-7

I

• Turn

power

•

Change

analog

(Mod

1.

5.3.3.3

"""d 2. 5. 3 . 3 .4 )

• Power

on

and

(5.2.

I,.

off.

card

adju,t

• Turn

power

Open

Change
,Mod
Mod
Power

'5.2.

off.

right

side

feature

power

off

analog

1.

5.3.3.3'

2, 5. 3 . 3 . 4 I

on

and

I,.

•

• Remove

(A2, 82, M2, N21.

• r",n

•

•

cover.

cordIs)

.

card

adjust

•

Turn

power

• Remove

• Remove

A2,

82, M2,

•

Turn

power

off.
right
feature

on.

side

N2.

cover.

card(s)

Sheet 8

Diagram 4·1. Display Station Troubleshooting Diagrams (Sheet 6 of

29)

•

Tum

power off •

Remove

front

control
power

on.

unit.

cover.

•

• Disconnect signal cable
from

•

Turn

•

Remove

right side

cover.

•

Remove

front cover.

• Disconnect control unit
cable.

•

Tum

• Change anolog card
(Mood

Mod

• Power

(5.2.1).

I

power

1,

2,

5.3.3.4).

on

off.

5.3.3.3

and adj ust

Red

•

Tum

power

• Repair security keylock,
or change switch
(5.3.7).

off.

Green

Diagram

*

Moodel 2 only.

4·1.

Displav Station Troubleshooting Diagrams (Sheet 7 of

29)

• Perform Test Pattern 1

procedure

after

for

each

Sheet

(5.1.1).

parity check

key.

17

• Check

No

Yes

Troublelhooting Diagrams 4-9

Sheet

Displ
include
cord
without
light-pen.

2,4,6,9,

ay

statio"
keyboard

reader

..

with

leclar

10,26

features

and

or

•

Move

from

•

Replace

feature

•

Tum

• Test
operations.

keyboard

Z4

Ia

keyboard

cards

power

keyboard

Zl.

on.

(A2,

cable

82).

Yes

•

Replace
feature

• Turn

• Test
operations.

keyboard

cards

power

keyboard

(A2,821.

on.

Yes

• T urI"

power
Replace
feature
Replace
feature

previolJsl y

Move

keyboard

ho'"

Zl to Z4.

off.

cord

card

light-pen

card

removed.

reader

(N21.

(M2)

coble

if

• Turn

power

off

light-pen

card

power

keyboard

off.

cord

cord

keyboard

to

Z4.

on.

reader

IN2l.

.

1M2,.

coble

• Replace
feature

•

Turn

• Test
operations.

• Turn

•

Replace
feature

•

Move
frolT'

power

Zl

-""od.1

•

•

•

2

onl

y.

Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 8

No

of

29)

4-10

• Turn

•

Open

• Remove

IA2,

• Turn

power

right

82,

power

off.
side

feature

M2,

on.

cover.

card(s)

N21.

Probe

power

Probe

power

Sheet

while

on.

while

on.

8

turning

turning

Sheet

10

*

Model 2 only.

Diagram

I

Probe

while

on.

turning

I

power

Yes

4·1.

Display Station Troubleshooting Diagrams (Sheet 9 of

29)

Troubleshooting Diagrams 4-11

Sheets

9,

28

•

Disconnect

from

• Remove
(A2,

• T

ur"

COr'ltrol

feature

82,

power

M2,

signal

unit.

on.

card(s)

N2I.

Yes

coble

Yes

• Turn power

•

•

• Remove

off.

Open

front

Disconnect

(A2, 82, M2, N2).

cover.

CU

feature

cable.

cord(s)

Green

Other

• Turn power

•

A2, 82, M2, N2.

• Turn power

Remove

off

feature

on.

•

cord(s)

Otfter

Other

Other

Green

Other

Model 2 Only

I

Diagram 4-1. Display Station Troubleshooting

4-12

Di.gr.ms

(Sheet

10

of

Other

Other

Other

29)

• Turn POW"

• Remove

front

•

Disconnect

from control lJnil.

• Tu,n

po_'

off.

cove,.

lignal

on.

cabl.

•

Display

attached

station

10

an

mUlt

active

be

Diagram

4·1.

Displav

Station

Troubleshooting

Diagrams

(Sheet

11

of

291

•

Turn

po_r

• Repair

security

(5.

•

V.rl

off.

cabl.

Or

k.ylock

J.

7).

fi".

Troubleshooting

change

switch

Diagrams

4-13

Probe

while

pressing a

and

RESET

alternately

character

key.

key

Remove

·

Disconnect
Press

·

·

Pre.s

·

RE5ET
Space

Probe

listed

right

CU

pin.
in

side

key.
bar.

cover.

cable.

2A2-2B2
Probe 1
B2505

B2S08
B2509

B2502
B2U05
B2Ml0
B2U09
B2Mll
B2513

Code

G

R

G
G
G
G

G
G
G G

Chart

G

R

Probe pins

PrObe

pi,,~

I

Diagram

No

Yes

4-1_

Display Station Troubleshooting Diagrar'ns (Sheet

12

of

P'ohif' pin,;

291

4-14

• Press

CLEAR

and

key.

re

lease

Probe

whil.

a character

pr

key.

••

sing

Other

Red

and

Green

Sheet

21

Customer program
All fields
protected.

defined

error.
as

Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet

13

of

29)

Troubltllhooti

..

0.......

4-15

Probe while pressin8
a

choroc'-r

key.

2Cl

Shee'

18

K

Ves

Shee'

9

No

No

Ves

Probe while

_~,..".&-.,..."...---.

Shee'

D~

...

m 4-1. Display Stlltion Troubleshooting Dill8raml (Sheet

____

Pulsing

21

Green

key pressed.

L-_;"';"'

____

holdirIQ

...J

4-18

14

of

Shee'21

29)

No

No

No

Y

..

---'--...,-- - -

Probe

while

while

holding

holdl",

leey..-d.

Sheet

21

f

Probe

keyp--'.

--.'---..,;.----~

Other

G

....

n

• Connect CU

•

Load

• Olaoonnect

e

.....

e

Press

CUl1Dl' up

e

Pr_

briefly.

T

..

t Pattem 1.

RESET.

•

leey

OM

.....

leey

M

Sheet 16

cable.

CU

to

cable.

IftOve

row.

Diagram 4-1. Display

No

Station

SM: Mod

I,

Olag

Mod 2,

Olag

$Met

21

Troubleshooting

3-1
3-2

Diagrams

Probe

key",...ed.

(Sheet

while holding

15

of

29)

Other

Troubleshooting

Diagrams 4-17

Sheet

IS

Probe

while

holding

~

Sheet

key pre,sed.

17

Sheet

Probe while holding _

key

prnsed.

Red

ond

Gr

.... n

19

Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet

4.18

16

of

29)

Either

or

buffer

protected

reported.

trouble

wos

when

disappeored,

fully

trouble

Sheet

16

No

Sheet 7

No

_--1..---,-

Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet

17

of

29)

- - -

Otner

Sheet

-r---------,

Probe

while

I

key

pressed.

21

holding

_

Yes

Troubleshooting Diagrams

4-19

Sheet

>heet

11

14

Probe

while

ERA

holdir>9

Sf

EOF

key

pressed.

Probe

while

ERASE

EOF

Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 18

holdir>9

key

pressed.

of

29)

Probe
ERASE

pressed.

while

INPUT

~olding

key

4-20

Sheet 16

Pulsing

Green

She.t

Probe

while

key.

pressing

Probe

while

holding

key

pressed.

21

_

RESET

Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 19

of

291

Troubleshooting Diagrams 4-21

Sheet

26

No

.r--

........

----,

- - - - - -

Other

...--------..,

Probe

foiling

while

key,

pressing

Change
keybutton

defective

(5.3.5.5).

No

R~d

81'llk

IEcK:h

(Imp.

dlph~'vme'

Ie

kfl'Y

pr

..

~st!d

dno

character

Pro

hE>

whilp

fA"

key.

Nhilp

"'y

["e~\i"g

orp,>:.;"o

CfAR

Pro~)e

(I

Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet

4-22

20

of

29)

Sheel9

•

Chonge
feedback

•

Replace

if

foilure

audible

assembly
still

original

occurs

cord.

.

s •• parograp!.

descriptian
and 8

••

ybaarda.

5. 1 .•

for

~

Type

A

No

•

Type

A-

Chong"

keyboard

ossembly

(5.3.5.3\.

e

Type

8-

Chonge

circuit

board

(5.3.5.11).

No

Other

Probe

character

lost

position.

while

in

ent

ned-to-

...

ng

Yes

Yes

No

Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 21

of

29)

I •

~r:o~~s;:~:=~d

I

15.3.5.

I\,

I • Remove top
I

I •

I battom pon

cover

(5.3.5.2\.

::=~~~;!:,rd

(5.3.5.3).

Troubleshooting

Diagqms

~23

Other

Probe

switch

e

Chonge
light-pen

e Verify

while

closed.

holding tip

selector

(5.3.81.

fix.

Diagram

4-24

4·1.

Display Station Trouble.hooting Diagrams (Sheet

22

of

291

• Model 1-Remove left

side

cover.

• Model 2-Remove front

cover.

• Unplug

lin.

cord

source.

-PULL

from

switch.

power

• Pull

OFF

e Set ohmmeter on X 1

range.

• Mealure resistance
across line cord plug.

Ves

Ves

Sheet 2

e

Turn

power off.

• Change

analog

(Mod

1,5.3.3.3

Mod

2,

5.3.3.4)

• Power on and
(5.2.1)

cord.

adiust.

e

Change,

in following

order:

1.

PC

board

(5.3.2.1).

2.

AC

capacitor

(5.3.2.3),

3.

Ferro transformer

1,5.3.2.6,

(Mod

5.3.2.7)

Mod

2,5.3.2.8,

unit

5.3.2.9)

installed.

• Check for repair ofter
each

Ves

No

No

ug

2-wire

connector

P2

on bock

pow.r

pi

ns

5.3.2.6,

5.3.2.7

5.3.2.

bal(.

of

pi

ug

range.

of pri mary

• Measure resistonce
ocross
removed.

• Ohmmeter on X 1

Change ferro transformer

1,

(Mod

Mod

2,5.3.2.8

Yes

• Turn power
e Remove plugs

e Change fuse F 1 •

•

Change line

and
pow.r

Tum

P4

bOl(o

pow.r

from

off.

prime

on.

cord.

P2

Ves

•

Ch.ck

prime power

• Change prime powerbox
(Mod

1,

5.3.2.4

Mod

2,5.3.2.5)

• Change fuse

•

Reconn.ct

Fl.

all

conn.ctors.

bOl(

if

and

no

connectors.

shorts

or.

evident.

•

Turn

power

power

board.

1,

5.3.2.6,

5.3.2.7

2,5.3.2.8,

5.3.2.9).

off.

plug

P2.

Fl.

on.

off.

P1

from

Fl.

Fl.

connectors.

•

Reconn.ct

• Change fuse

• Turn power

•

Turn

• Reconnect plug P4.

•

Remove plug

PC

• Change fuse

• Change ferro transformer
(Mod

Mod

• Change fuse

• Reconnect all

No

No

•

Ch.ck

cord

connectors.

• Change cord
no shorts are

• Reconnect all

Sheet 25

reader

reader
evident.

connectors.

and

if

Diagram 4-1. DispilY

Stltion

Troubleshooting Dillll'llmi (Sheet

23

of

29)

Troubl ..... ooting Diagrams 4-26

Sh

• Remove

regulator

•

Change

fuse.

• Turn power
sec,

then

•

Check

F3

•• t 23

on

off.

again.

No

V.s

card.

for 10

Change

ferro tronsformer

(Mod

1,

5.3.2.6,

5.3.2.7)

(Iv'tod 2,

5.3.2.8,

5.3.2."

Change

(Mod

5.3.2.7)

(Mod

5.3.2.9)

__

ferro transformer

I,

5.3.2.6,

2,5.3.2.8,

---1

Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet

24

of

29)

•

Change

• Disconnect
power

• Turn power

• Measure +

No

Chonge

(5.3.2.

fuse.

plug.

Ves

PC

11.

analog

on.

8V

board

.

Ves

•

Change

onalog

1,5.3.3.3

2,

5.3.3.4\

on

and

card

adjust

(Mod
Mod

• Power

(5.2.11.

4-26

Sheet

23

• Turn power

• Reconnect

• Remove plug

• Change f

• Turn power on for

•

• Replace plug

• Remove lines supplying +5,

•

• Change fuse.

•

.....

then

off.

Check

flMe

and

-12

to

logic

page

DO

NO T remove plug

low-voltage

Turn

power

then off.

•

Use
Y

AO

in
gote,
logic card(s) by
removing
from

•

If

nat

cards,

logic

off.

plug

PI

from

P3

from

about I minute,

F 1 in primary

P3

on

analog

logic

gate.

YAOll for

PC

board.

on

for

about 1 minute,

wiring

diagram

11

to

locate

wiring

10

logic

or ilOlate 10

all

gate.

in wiring or

change

board.

analog

connectors.)

P2

cards

PC

paw.r

(See

short

board.

card.

-+6,

from

card.

box.

No

+~,

FEALD

Yes

Change
board

PC

(5.3.2.1)

• Replace plug
e Remove

push-an

pin 5 of

e Tum pawer

HV

then

off.

•

Change

(Mod

Mad 2,

•

R~place

to

pin

e Power on

(5.2.ll

1,

P3

on
connector

power IUpply

on

for

about 1 minute,

analog

card.

5.3.3.3

5.3.3.4)

push-an

5 HV pawer

and

adlUlt.

analog

connector

supply.

cord.
to

(+~V).

No

Change
pawer

suppl

(5.3.2.10)

HV

y

Diagram 4-1. Display

Station

Troubleshooting

Diagrams

(Sheet

25

of

29)

Troubleshooting

0 iagrams 4-27

•

Verify

functIons

• Swap

cobl.
good

all

offline

are

coaxIal

wIth known

devic

•.

correct •

sIgnal

Yes

Yes

Diagram 4-1. Display

Station

Check

cooxial

connector

coble

to

input

Troubleshooting

from

board.

Diagrams

(Sheet

26

of

29)

No

• Reseat ex>nnector.

•

Check

card

operations.

• Return to

reader

customer.

Check

connector.

that

card

reader

e Press

and

•

Feed

RESET,

RESET

test

keys.

card

No

CLEAR,

into

Yes

Sheet

28

---------,

Pins for

next

identified

reoder

coble

assembly.

Measure
resistance

A 1

and

A2

cable

plug for

approx

imote Iy

Check

display

power

cabling

reader

ex>nnector

transformer.

by

150Hz)

reoder

between

of

check

numbers on

plug

reoder

400

station

from

motor

to

are

pins

ohms.

card
ferro

- - - - -

No

Yes

--

Measure
resistance

and

10
cable
approximately

Refe'

10 Reode-;::MOtorized

Theory-Maintenance-

Par~

Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet

reoder

between

24

of

plug for

to

IDR-M

Catalog.

27

motor

reoder

400

of

pins

ohms.

29)

Troubleshooting Diagrams

4-29

Sheel27

operotiOr"5

• Relurn 10

• Insert

• T

...

sl

cord

operations.

•

Retvf"

C(

cu,tomer.

card

corrC!ctly

read

.. ,

to

customet.

No

• Press
and

•

Jesl

RESE

RE,ET

cord

No

T,

CL

~eY'.

reoder

EAR,

I

I

•

Disconnect
from
and

•

Set

•

Connect

on

attached

•

Check
wires

.]V

I!xil'!

OIA-N2007,

008.

VOM

minus

wire

formerly

to

Ihe

for

approximateI

ac

as

reader.

reader

on

N2008.

two

lest

.5V

cord

de

1-"

signal

cable

8(\3,

l~ac1

v

Retvrq

Cursor

prolected

under

character.

Diagram

to

was.

CW'I

cvstoMef.

in

fiei.:!

attrihute

4-1.

a

or

Display

•

• :::heck

Station

Check

cord

co!')nections

coble

Connect

grl)vr'ld

Te,t

cad

operations.

wires

to

reader

and

signal

reade'

cudome

ground

.::orredly.

signa!

0IA-"<2D07

01A-N2DOB.

•

•

• Returr'"

Troubleshooting

B03.

and

cohle

of

r

.

01

Ye,

Diagrams

(Sheet

28

of

29)

Refer

10

IDR-M

ID

~"ader-Motorized

Th';~~

Ports

Catalog.

Ye,

No

Return
customer.

to

4-30

Turn_oil

lie

Mealure ,

~

A/F2-B Mod I
01C1F2-B Mod 2

No

.......

+34V

....

tarec:.

CII

....

In

10110"'",

otdo<'

I

LVPC

Boord

(5.3.2.11

2.

Ferro transformer

(5.3.2.615.3.291

o..ck

for repeir after

..

chstep.

F

.....

0<

With

ohmme'.'

keybo.rd

tln\e

until

21124

to

connector

one.,

Short

c.rd.

stili

connected. remove
co,dsiftOIA/A1.nd

the

OIA/Al

•

ISOI.ted

or board

IS

connector

In

R

........

10<30

T ..

,n_on

tu,n

_

34VI

......

Chock In

ohm

.....

'.

__

_

oil.

ChocIl

'n_

Chongo

In

10110wt'"

ordlr.

1 An.IOIIcord

2.

HV

go

....

a.c:k

for

f'ePIi"

ooch '

...........

CIIocIIend,_rr

3CV

wi"",

L'o'_,suppiV

CirCUit boarel

t

...

hoidet. s..

1000IcPIfIOVAOII

for

WIr'

routine

, s .. pplv

.fte,

nl.

from

to

fol1owl",

o,do<

1.01A/A1M2cord

2

34

V

WIring

from

tu

..

10

boord. s..

1000Ie

pogo YAOII

wire

routine.

3 34'0'

ont'v

on

It

0IA/A1K8B04

bGo,d

fo'

Troubleshooting

Diegrams 4-31

Section 5. Checks, Adjustments, and Removals

This section contains all alignment, adjustment, and

removal procedures
Display Stations.

checkout procedures

required and

to

nece~ry

to

maintain

IBM

It also contains service checks and

to

determine whether adjustments are

verify

the

accuracy

of

any adjustments

3277

made.

5.1 CHECKS

5.1.1 Display Station Test Using Test Pattern 1
A comprehensive test

features

is

performed
the procedures described
step-by-step procedures describe
various operations should be performed and

of

expected

each operation.

The tests should be performed
presented, because each test
the

screen from preceding tests. The observations described

in

paragraph 5.1.1.1 apply

testing depends on what features are attached

of

the

display station and

by

using diagnostic Test Pattern 1 and

in

the

following paragraphs. The
the

sequence

all

in

which

attached

the

in

the sequence

is

dependent on data left on

to

all display stations. Further

to

the

the

results

display

station.

If a problem
ational test, refer
shooting Diagrams

5.1.1.1 Initialization and Observations

1.

Load Test Pattern 1

is

discoverect while performing this oper-

to

the

to

Symptom I ndex or

resolve

the

problem.

on

display station being checked.

the

Trouble-

(See paragraph 2.2.1 for instructions for loading Test

Pattern 1.)
that

should

SYSTEM AVAILABLE

be

on

after

pattern

is

the only indicator

is

loaded.

2. Take display station offline by removing control unit

signal cable. Jack
under front cover. Do
removing cable

3. Compare image

is

located at front of display station,

not

turn

power off while

or

Test Pattern 1 wi" be lost.

on

screen with expected image shown

in

Diagram 2-4. The "NON DISPLAY" field should be

blank.

Top

two

rows are displayed

next two rows are displayed

is

of last row

displayed

4. Check for only

character position

in

high intensity.

one

cursor. Cursor should be

of

second row

5. Check quality of displayed image.

or

tilted

blurred, and characters should be formed

in

normal intensity,

in

high intensity, and half

of

displayed data.
Image should

in

not

first

be

properly with correct inter-row spacing.

6. Vary Brightness

control. Set it where high intensity

characters have proper brightness.

7. Vary Contrast control.
characters contrast with high intensity characters

Set

it

where normal intensity

at

desired level.

5.1.1.2 Security Keylock

1. Turn security key
disappear from screen,
should

light, and cursor should remain displayed.

2. Turn security key on. Original data should reappear

5.

1.

screen,

and

1.3 Tests

INPUT INHIBITED indicator should go

from

Test

(Optional Feature)

off

(vertical position).

All

INPUT INHIBITED indicator

Keyboard (Optional Feature)

data should

on

out.

Press the RESET key. The display image should appear as
shown
character C
indicators should

in

Diagram 2-4, with

in

the

second row of displayed data.

be

on.

1.

Key

in

the

row

of alphabetic characters and

space exactly as they appear

the

cursor located under the

in

the row above.

the

No

one

All

characters should enter correctly, and cursor should

move under

2.

Move
data, using

3. Press

I after Space bar

cursor under C of

~ (Right) key.

INS

MODE

key. INSERT

is

pressed.

CK

in

second row of displayed

MODE

indicator should

light.

4. Press A key. Field should now appear

A~K.

5. Press FIELD MARK key. (Use B key on Ope.ator
Console keyboard.) Field should now appear

A;

~K

(AB£K).

6. Press C key. The data should

not

change,

but

the

INPUT INHIBITEQ indicator should come on (in

addition

INSERT

MODE

indicator, which has

to

the

remained on.)

7. Press

8. Press DEL key. The

9.

RESET key. Both indicators should

C should disappear, and the field

A;~

should now appear

(AB~)'

Press +-I key (New Line). Cursor should move under C

character

in

fourth row of displayed data.

10. Enter the special characters as they appear

go

out.

in

the row

above, shifting where required. Cursor should appear

under 0 character after last special character enters.

11. Enter

the

digits 0 through 9 and the characters, . - and

A as they appear

in

the row above.

keyboards, use the , over

(On

Data Entry

* and . over $ keys

to

enter
the , and . characters.) The following results should
occur:
a. Typewriter and

out

numeric lock feature -

Operator Console keyboards with-

all

characters should

enter.

Checks, Adjustments, and Remova.. 5·1

b. Data Entry keyboard without Ilumeric lock

feature -

characters,

character enters as

c.

All

keyboards with numeric lock feature - char-

acters . and -

lock and

INPUT INHIBITED should light

and A keys are pressed. (Use Reset and

. and - entpr .nnrrnally; the A

< symbol.

enter

normaHy; keyboard should

when,

-+

keys to

move cursor from those positions.)

Check t (Up),

12.

'"

(Down), and ~ (Backspace) cursor
move keys for proper operation.
Check

the

13.
other

in

the

Typamatic function of

key with Typamatic.capability. Use

fourth row

of

displayed data for this step.

14. Move cursor under first character displayed

the

Space bar

the

or

any

first field

of

test

message.

15. Press any alphameric key.

tor

should come on, and character should

display because field

INPUT INHIBITED indica-

not

enter

is

designated as a protected data

or

field.

16. Press

17. Press ENTER key. INPUT INHIBITED indicator

RESET key. INPUT INHIBITED indicator should

go

out.

should light, and keyboard should lock.

18. Press

RESET key. INPUT INHIBITED indicator should

go

out,

and keyboard should unlock.

Note: The following steps check tab, DUP, and new

line functions.

~

19. Press
character A

20. Press
position, and cursor should move under

(On
should move under
should

21.

Space one character position. The I should disappear.

22. Press
space

23. Press Tab key.
boards.) The cursor should appear in
position of

(Tab) key. Cursor should appear under

in

second row of characters.

DUP

key.

An

asterisk

(*)

should appear

in

cursor

I of INSERT.

Operator Console keyboard, use Tab key; cursor

I of INSERT,

not

appear.)

t+- (Backtab) key. Cursor should move back one

to

where

the

I was formerly located.

(Use

SKIP key on Data Entry key-

the

fourth row of displayed data.

but

the asterisk

the

first character

Note: The following steps test the erase and clear

functions.

in

24. Position cursor under character E

second row of

displayed data.

25. Press

26. Press E

27. Proceed

ERASE EOF key. Characters E through Z should

not

disappear, and cursor should

RASE I NPUT key.

including keyed-in characters and field

appeared as

INSERT CK, should disappear from screen.

to

paragraph 5.1.1.4 if display station being

tested has a selector light-pen attached.

move.

All

unprotected data,

that

If a pen

originally

is

not

attached, press CLEAR key. All characters remaining

on

screen should disappear, and cursor shou'd reappear

in

first character position

in

first row. Press RESET

key.

to

28. Proceed
operator identification card reader attached.
reader
off, and reconnect control

5.1.1.4 Selector Light-Pen Tests (Optional Feature)

1.

Fire pen on detectable field
as its first character. Question mark should change
greater-than

paragraph 5.1.1.5 if display station has an

is

not

attached,

(»

symbol. Remainder

test

is

completed. Turn power

unit

signal cable.

that

has

c:J

Question mark

of

field should

If a card

to

not

change.

2.

Fire pen again on the field. The greater-than symbol

to

should change back

not

field should

change.

3. Fire pen on next detectable field

a Question mark. Remainder of

that

has a greater-than

symbol as its first character. The greater-than symbol

to

should change

not

should

4.

Fire pen again on same field. Ouestion mark should

a Question mark. Remainder of field

change.

change back to a greater-than symbol. Remainder of

Id

not

field shou

5.

Press CLEAR key.

disappear, and cursor shou

O.

Press RESET key.

6.

Proceed

change.

All

to

paragraph 5.1.1.5

characters on screen should

Id

move

to

character location

if

display station being
tested has an operator identification card reader
attached.

a card reader

is

not

attached, test

If
completed. Turn power off, and reconnect control unit
signal cable.

5.

1.

1.5

(Optional Feature)

1.

Key

in

2.

Return cursor

Operator

a few characters

Identification

on

the screen.

to

character position

Card Reader

1.

(Do

not

Tests

use

CLEAR key.)

3. Read

card reader test card

(PN

2143816). The

in
following events should occur:
a.

Keyed-in data disappears from screen.

b.

Cursor moves

c.

INPUT INHIBITED indicator comes on and stays on.

If

cursor does not move

u nsuccessfu

4.

Tests are now completed. Turn power off, and reconnect

40

character positions.

40

spaces, read-in operation was

I.

control unit signal cable.

Display Station Operational Test (without Test

5.1.2
Pattern 1)

Quick

The following test sequence is a
that

can

be

used

as

an offline display station reliability test.

This procedure tests

is

not

as

but

comprehensive as the procedure described

display station circuitry extensively,

checkout procedure

paragraph 5.1.1. It can be used as a Quick checkout to

is

verify correct operation after maintenance

performed.

(7)

a

is

in

5-2

Perform

2.

3.

4. Press

5. Exercise

6. Press several alphameric

7. Key in a

8.

9.

10. Exercise

11. Move

12. Backspace

the

steps

in

sequence

1.

Turn

power

off.

Take

display

cable

from

front

of

for

access
Turn
appear
should

-+ (Right) key,

move

through

reaching last

in first

station

display

display

to

it.

power

on

screen

be

lighted.

character

character

offline

station

station.

on.

Within

at

character

and

each

character

location in second row.

t (Up), + (Down), +-' (New Line),

(Left)

performs

ponding
move

character
character

Press

cursor

Exercise
Observe display screen as each

that

meric

just

cursor

one

an

location,

proper

cursor

move keys. Observe

its

operation

characters

space as

complete

of

row

position

correctly.

should

each

row

enters,

of

next

alphameric key. Char.acter

and

cursor

both

upper

characters

Typamatic

into

enter.

function

last row,

chararacters.

cursor

near

entered.

for

most

by

I/O jack.

Front

15

location

hold it

location in

location,

keys

in succession.

display,

new

character
of

cursor

row.

should

and

lower

of

and

middle

effective results.

removing coaxial signal

cover

seconds,

down.

cursor

characters. When last

should

advance

shift

key

is

each
key

of

group

13. Press INS MODE key. INSERT MODE
light.

14. Press

right
to

first row.

15. Press

enough

of

cursor

to

move

RESET key. INSERT MODE

to

times

end

to

of

cause

row

indicator

Space

bar

out.

16. Delete several

cursor
same

row

character

17. Move

18. Press

19. Press

20.

21.

cursor

ERASE EOF key.

tion

through

cursor

should

ERASE INPUT

and

cursor

Enter

several alphameric

If display

key

off.

INPUT INHIBITED

characters

position

at

should

right

position each

to

middle

last
not

should

station

Characters

of

time

of a row

position

move.

key~

move

to

has

the

should

should

using DEL

disappear,

cursor

should

DE L is pressed.

of

Characters

on

screen

All

characters

location

characters

security

key

disappear

light,

characters.

O.

as in

and
remain displayed.
Turn

22.

security

screen,

key

on.

and

INPUT INHIBITED

Original

data

should

should

Jack

is

located

must

be

removed

cursor

O.

the

No

indicators

Cursor

row.

should

should

should

After

appear

and

that

each

The

corres·

and

cursor

should

appears.

appear

should

appear

one

of

all keys.

in first

space.

pressed, checking

Typamatic

in

several alpha-

of

indicator

key.

characters

should

characters

and

wrap

around

should

key.

Character

and

characters

move

left

from

cursor

posi-

should

step

lock

erase,

should

6.

feature,

from

cursor

erase,

turn

screen,

should

reappear

go

out.

at

+-

key

in

at

go

in
in

one

and

on

23.

Press

CLEAR

should

reappear in

24. Press Backspace

25. Press

26.

sound
If

an

any

when
operator

proceed

control

27. Press

unit

CLEAR
alphameric
Return

28.

29. Read

30.

Observe
cursor
from

31.

If

cursor

in

moves

screen as

cursor

key,

disappear

from·

character

key

two

character

key

key.

is

pressed if

identification

to

step

27.

signal

cable

key,

characters

to

location 0 using +-(Left)

card

reader

test

that

INPUT INHIBITED
40

spaces,

card

passes

does

not

move

then

RESET

screen,

location·

times.

Audible

Turn

if a

RESET

as in

step

card

and

through
40

O.

feature

card

power

card

key,

6.

(PN

keyed-in

spaces, read-in

was unsuccessful.

32.

Offline
reconnect

5.1.3 Voltage

A

ferroresonant
and multiple secondary
voltages. (World
ferro

protected
is

located
consist
CRT

LV

tests

are

completed.

control

unit

signal cable.

Clecks

transformer

Trade

with a tapped

(ferro) with a

taps

provides

Corporation

primary winding.)

by fuse F 1 in series with its
in

the

prime

power

box.

of

low dc voltages, high dc voltages,

filament

printed

voltage. These voltages

circuit

(PC)

board

or

(TB1).

to

the

+8V

screws

Symptom

is

DC

and

on

the

Refer

Diagrams if a voltage

5.1.3.1 Low-Voltage

Modell:
the

For

capacitor

Diagram 7-9 shows
capacitor screws. Remove
the

circuit

board.

For

+5V

at

the

fuse holders

at

A/F

Index

incorrect

or

Checks

-12V, measure
the

LV

location and

the

left side cover

and

+34V, measure

1-B

for +5V

(Diagram 7-3).

Model 2:
through
printed circuit

designates

voltage.
fuse holders

For

+8V

the

access holes

the

For

+5V

at

and

board.

A line with

pairs

of

and

+34V, measure

01C/F

1-8 for +5V and

-12V, measure
in

the

terminals associated with

(Diagram 7-E). Diagram 7-10 illustrates

Remove

the
following voltages can

the

Observe

correct

front

cover for access

the

polarities

test

leads

of

the

to

prevent damage

be

measured

to

terminals,

at

key. All

and

cursor

alarm

(feature)

is installed.

reader

off,

reader

then

and

is

is

not
enter

key.

2143816).
indicator

data

reader.

Turn

power

110V

all

display

display

stations

The

primary

Display

winding. F 1

station

and

can

be

checked

at

Terminal Board 1

and

Troubleshooting

is

missing.

the

low

dc

printed

the

circuit

polarity

for

and

A/F2-B for +34V

the

low

shield

that

arrowheads

the

voltages

01C/F2-B

the

PC

board

the

circuit

and

to

the

the

PC

board:

characters

should

should

attached,

reconnect

attached.

several

comes

on,

disappears

operation

off,

and

ac

primary

station

use a

ferro

voltages

6.3V
at

voltages

board.
of

access

the

voltages

dc

voltages

covers

at

each

end

each

at

for

+34V

shield.

board.

probe

with

meter.

The

is

ac

the

at

the

to

the

the

Checks,

Adjustments,

and Removals

5-3

+5V ± 1 0%

+8V ±12% (This voltage

+34V

-18V (This voltage

-12V ±4%

5.1.3.2 High-Voltage Check

The

only

high voltage

dc

(which
voltage
should
supply,

with

circuitry

1.

2.

3.

4.

5.

is

is

correct,

also

it

is

the

standard

whenever

Turn

power

Set

voltmeter
measure
Connect
terminal.
Connect
terminal

back slightly.

Turn

power

6. Check

(Because
impossible

with

the

is

given.) If voltage

test

leads
circuitry

proceed

7.

Turn

power

8. Remove push-on

terminals 1

9.

Turn

power

10. Check again for
voltage
from terminals,
nectors,
(paragraph
the

HV

5.1.3.3 Arc-Suppression Check

A defective arc-suppression
tive HV

experienced

power

(This

voltage
A/F 1 (Modell)
(Model 2) Diagram 7-5.)

PC

board.)
±10% (This voltage
A/F2

(Modell),

(Model

PC

regulator

-12V will also

be

for a meter

power

2),

Diagram 7-5.)

is

fuse-protected

board

derived

corre~t.

impossible

off.

up

to

minus

plus (+)

2 (Diagram 7-14)

on.

this

to

IBM

from

(paragraph

with

off.

and

on.

is

correct,

and

5.1.3.3).

supply

with

and

card.

be

that

from

the

other
Because
to

obtain

voltmeter.

HV

troubles

selector

+400V

measure

meter;

steps 7 -10.

either

(-)

meter

voltage

is

term

ina

connectors

2.

+400V

turn

reconnect

check

supply

or

dc.

meter

indication

therefore,

correct,

5.1.3.3).

If

(paragraph

analog

of

If

missing.)

should

the

switch

is

the

Is,

the

voltage is still

circuit

the

is

protected

Diagram 7-3

is

protected

is

protected

Diagram 7-3

is

the

input

this

voltage

be

checked

HV power

high voltages

the

+400V

an

accurate

Check

occur.

lead to HV

by

a low-current

+400V

and

±50V

power

power

the

to a position

lead

on

sliding push-on

of

dc

the

wide range

turn

power

check

the

If

voltage

from HV

dc

off, remove

supply

arc-suppression

5.3.2.10).

may

card.

If excessive

two

assemblies,

by

fuse

and

01C/F

by

fuse

by

fuse

and

01C/F2

by

fuse

to

the

is

missing,

is

the

supply).

for

the

is a low-current

measurement

arc-suppression

that

any

dc

power

connector

+400V

on

appear

±50V

supply,

operating

of

off,

arc-suppression

is

incorrect,

power

terminal 2. If

test

push-on

circuitry

incorrect,

as a defec-

trouble

check

at

1

F2

on

at

F3

on

-12V
the

+400V

If this

CRT

will

return

supply

dc.

it

voltage

±50V

remove

supply

leads

con-

change

the

arc-suppression
circuitry
Diagram 7-15)
voltage
display

Visual Checks:

1. Check

2. Check
other

3. Check

showing

Model

1.

2.

3. With

4.

Model 2 Resistance Checks:

1.

2.

3. With

is

4. Replace voltage

arc-suppression

change

distribution
4,
the

5.1.3.4

The
voltage
determine
filament
The

5.3.3.2,
located

1.

2.

is

is

located

distribution

stations.

for

bent,

for

bent

components

for

obvious

1 Resistance Checks:

Turn

power

Remove

pins
specified:

Replace

not

Turn
Disconnect
minals 12, 13,

pins
specified:

not

If

if

troubleshooting

Turn
Set
measure

arc-suppression
the
on

and

E9

El0

and

correct.

power

the

on

the

12

and

14

and

correct.

the

above

the

the

checks

6.3VAC

CRT

filament

used

if

at

CRT

cone

steps

on

the

power

voltmeter

CE VOM,
the

the

CE YOM,

13
15

arc-suppression

board

the

6.3V

circuitry

on

broken

off.

arc-suppression

E13

E14

arc-suppression

off.
wires

voltage

- 1 Megohm

- 1 Megohm

checks

circuit

were

in

6.3V
back

shield

1-3).

LV
off.

ac.

as

on
Model 1 display
board

broken,

capacitor

and

could

capacitors

damage.

check

- 1 Megohm

- 1 Megohm

from

14,

and

check
distribution

distribution

do

and

(Model 2).

performed

diagrams.

Check

voltage

the

display

ac

is

of

the

must

This

PC

board.

selector

listed

below.

the

arc-suppression

(TB1, Diagram 7-11)

or

missing wires.

leads

cause

board

from

between

board

board

voltage

15.
between

board

board

not

reveal

if excessive

board

(Model

Return

as a

of

6.3V
station. A quick

present

voltage

CRT

be

removed

switch

is

ne~k,

is

Arc-suppression

stations

that

are

arcing.

or

other

its

socket.

the

following pairs

for

E7

and

E13 -Infinity

E7

and

E14

if

the

distribution

the

following pairs

for

13

and

16

14

and

16 -Infinity

if

the

an

obvious

trouble

1)

to

Diagram 4-1,

result

of

ac (±10%)

to

look

near

to

see

protected

to a position

board

(Zl,

and

on

on

Model 2

too

close

components

the

resistances

- Infinity

resistances are

board

the

resistances

- Infinity

resistances are

fault

in

persists,

or

the

voltage

sheet

instructions

is

the

only

check

for

a glowing

the

tube

socket.

filament

by

fuse F 1

that

the

to

of

ter-

of

the

in

ac
to

(par.

will

5-4

3. Remove fuse

display stations.)

4.

Connect a meter

5.

Tum

power

6. Check

7.

Turn

power

holder.

8. Reinstall fuse

5.1.3.5 High-Voltage Power

1.

Turn

power

2. Remove HV
retu rn).

3.

Set

CE

4.

Measure resistance

4.

5. Reverse

6. Replace HV
step 4 or

5.1.4

Keyboard Checks

Two

different
Display Stations. Both are identical in
only

slightly in external appearance.

Type

II

A"

top

to

bottom.

are

slightly concave.

with

the

and

type
regulator (large
keyboard

circuit
of

corner

board,

the

circuit
a 24-pin SL T
of

the

circuit

of

Fl.

on.

for a meter

off,

and

off.

power

See

Diagram 7 -14.

VOM

selector

meter

leads

power

5 indicate a

style

keyboards

The

keyboard

of

cable

the

cover

cable

connection

transistor

plugs

and

the

board.

connector

board,

circu it board.

(Remove

lead

indication

and

shield (if removed).

between

keyboards

have

rows

The

regulator

The

and

shield

on

each

end

of

6.3V

remove

supply

switch

and

measure

supply

shorted

an

of

two

removed by observing

into

Type B keyboard

which

the

meter

Supply

leads 3 (UV)

to

RX10

HV

power

again.

(par. 5.3.2.10) if readings in

or

open

may

even slope

keys

on

types

and

the

on

heat

the

rear edge

is

located

is

mounted

regulator

of

Check

be

for

access

on

Mode! 2

fuse holder.

ac.

leads

from

fuse

and

4 (DC

position.

supply pins 3

condition.

found

on

IBM

3277

operation

The

rows
downward

Type

can be distinguished

location

sink).

in

in

is

located in

and

of

keys

"B"

keyboards

the

location

of

the

The

Type

of

the

printed

the

left

corner

cable plugs

the

left

corner

the

vary

from

+5V

into

right

and

on

A

tronics assemblv (Type B
device. Do

While performing

assembly'

that

A faulty

good
the

factory

marked

and year.

5.1.4.1 Voltages
Type A Keyboards

keyboard locations):

1. Check

(ground).

2. Check

(ground).

3.

Check
voltage
keyboard
power
+8V

Type 8 Keyboards (See Diagram

locations) :

1.

Check

(ground).

2. Check

terminals
assembly)
the
regulator
circuit board
correct
connector
+5V

not

should

could

cause

keyboard

one. A

faulty

if

on

Type

for

for

for

is

supply. Replace

dc

is

correct

for

for

meter

is

and

are

incorrect.

attempt

be

erratic

it

is

less

A keyboard assemblies by week

-12V

+8V dc between

+5V

dc

developed (by

assembly) from

-12V

+8V

(under

and

+5V dc

negative

+8V dc,

and
the

and

display

only),

to

repair any

the

following

visually inspected

operation

assembly

Type

A assembly

than

one

(See Diagrams 7-7

dc

between

across

keyboard

the

the

and

the

+5V dc is

dc

between

dc

on

one

the

circuit

on

the

(-)

lead

to

and

the

electronics assembly if

+5V

dc

station

and

the

audible response

other

checks,

for

shorts

or

erroneous

should

year

the

keyboard

KB

output

is

be

should

old.

The

and

KB 1 pins

KB1

pins V(+)

capacitor

voltage regulator

display

assembly if

not

correct.

7-19

for

Type B keyboard

1 pin

002

of

the

voltage regulator

board

other

terminal.

test

pin

008.

is

+5V

incorrect.

power

supply

keyboard

the

keyboard

or

results.

replaced

be

returned

date

7-8

for

Z(-)

station

(-)

and

electronics

Reference

Input

dc. Replace

the

+8V

Check

if +8V and

units.

grounds

with

to

code

is

(01-52)

Type

A

and

X

and

X

C1. This

on

the

+8V dc

the

and

008

to

the

dc

is

KB

a

1

The following paragraphs
which can be used
check procedure differs for
and B),
procedure
one

1. External

2. A FRU in

3. The

I

Problems external
outlined in
include

support

I

the

is

of

three

to

keyboard
circuit board with key modules; Type B assembly
consists
key modules

of

the

keybuttons,

modules (Type A

to

isolate

differences are

used. Keyboard problems can

possible areas:

the

keyboard.

the

keyboard.

assembly. (Type A assembly consists of

circuit board

in

an all-keys assembly.)

to

the

Troubleshooting Diagrams. Keyboard FRUs

switch modules, spacebar assembly,

contain

keyboard

the

different

noted.

and

electronics assembly with

keyboard

only).

check procedures

problems. When

keyboard

Ensure

that

be

should be diagnosed

circuit board and elec-

types

the

correct

isolated

the

(A

to

as

5.1.4.2

Correctly

(2.5V dc minimum)
encoder. With
encoder
character

s;gnal
only

it

if

Strobe check:

Key
Only

functioning

generates

output.

is

generated properly, and

two

inputs

is

found

to

the

encoder

1. Set

selector

will

accurately measure

2.

Place minus

3.

Place plus

Module and Encoding - Type A Keyboards

(Diagram 6-11)

two

to

be

defective. Replace

or

the

switch

(-)

(+)

key

modules

input

lines

and

only

two

the

strobe

This

procedure

the

encoder. Replace

printed

meter

meter

circuit

on

vol

t-ohmmeter

5V

dc.

lead

on

lead

on

Checks, Adjustments.

present

to

the

keyboard

active

inputs

signal

checks

the

key

the

keyboard

board

KB 1 tab

KB 1 tab R (strobe

two

present,

and

the

that

the

modules

the

key

is

defective.

to a position

X (ground).

and

Removals

active

assembly

the

encoded

strobe

activate

module

assembly

that

signal).

5,),)

if

4. With no keys pressed,

2.5V. If the

step

7.

meter

5. Press and hold one alphameric key.
indicate less than 0.6V.

hi~er,

replace

the

meter

should indicate

indicates 0.6V or lower, proceed

The

If

the

meter indicates 2.5V

the

keyboard assembly.

meter

at

least

should

6. Press and hold two alphameric keys simultaneously.
The

meter should indicate

paragraph 5.1.4.3

O.6V

(or

lower)

7. With

meter

if

the

with

no

keys pressed:

leads attached

alphameric keys simultaneously. If

0.6V

or

lower, replace keyboard assembly.

8. Probe

KB1

pins

D,

E,

and Parity, Diagram 7-8) with

9.

Note

bit configuration
probe, a red indication
is

a 0 bit. With voltmeter, greater than 2.5V

and

less

than 0.6V

10. Find code

in

is

a 0 bit.

Diagram 6-5

configuration observed

11. Check center
module

be

removed from

for

two

lead frame terminals

2.5V

or

higher. (Keyboard assembly must

bottom

at

least 2.5V. Proceed

preceding results are correct.

as

in

steps 2 and

F, H,

J,

K,

L,

M,

no

keys pressed.

of

encoded

is

a 1 bit, and a green indication

or

6-6

that

in

step 9.

3,

press

meter

indicates

and N (bits

output.

With logic

is

corresponds

of

suspected

a 1 bit,

pan for this voltage check.

two

0-7

to

See paragraph 5.3.5.3.)

is

12. Replace defective module if 2.5V or higher

both

on

13.

If only

measures 0.6V

center terminals in

one

terminal measures 2.5V

or

less, recheck steps 8 through 11.

step

11.
or

measured

higher and

other

same results are obtained, replace keyboard assembly.

14.

Replace keyboard assembly

measured

in

step 11.

if

less

than

0.6V

3. Compare bit configuration observed

to

configuration for desired character shown

in

6-5 or 6-6.

or

5.1.4.4

Two SHIFT keys and
NUM

to

input signal
encoder generates upshift character codes
appearing

Shift

Key

Modules - Type A Keyboards

LOCK keys on

to

the keyboard assembly encoder. The

on

the

top

the

shift LOCK key (NUMERIC and

data

entry

keyboards) generate an

of

half of

the

keyboard keys. The

following procedure isolates a shift module failure.

1.

Set

bit

volt-ohmmeter selector switch

accurately measure

2.

Place minus

3.

Check

all

(minimum) on both

up

to

+5V dc.

(-)

meter lead on

three shift keys individually for 2.5V

center

key module when each key

(maximum) when key

4.

Replace shift module

on

both leads.

5.

If shift module generates proper levels, and keyboard

is

restored.

that

fails

to

a position

KB 1 tab

leads

X (ground).

of

the corresponding

is

pressed and for

to

generate

generates incorrectly shifted characters (5.1.4.3), replace
keyboard assembly.

5.

1.4.5 Spacebar Assembly Mechanical Checks

The spacebar assembly and mountings should be checked
for easy motion and freedom from binds. The spacebar
should depress and return
drag

or

If

binds. Replace
broken mountings,
may

not

is

(actuator) if

be necessary

the

problem

or

to

the restored position

the

spacebar assembly if binds,

bent

components are discovered. It

to

replace the spacebar module

is

mechanical.

step

in

Only

the

characters

proper

2 with

Diagram

that

will

O.6V

levels

without

5.1.4.3
The unshifted and shifted codes for

Output

Codes

a"

keys

on

both

type
keyboards can be checked by the following procedure,
which uses the logic probe and

1. Press and release desired key. Hold
on

data

entry

keyboards) key down while pressing key

desired character

is

on

Diayram 6-5, 6-6, or 6-7.

SHIFT

top

half

of

keybutton.

(NUMERIC

2. Probe pins listed below with logic probe, and note bit
configuration observed. A red
and a green

5-6

Pin

(lA

S05
S08
S09
S02
U05
M10

U09

M11

S13

(DOWN)

1-B2)

indication

(UP}

indication

is

a 0 bit.

Keyboard

0

'}

..,

oj

4

5

6

7

Parity

Bit

is

a 1 bit,

ADJUSTMENTS

5.2
Adjustment procedures for the

should be performed after it

IBM

is

established

3277 Display Station

that

all
voltages are correct. Paragraph 5.1.3 details
checkout procedure.

if

5.2.1

Display Image Adjustments

A test pattern generated by the diagnostic program provides
the display image
Pattern 2

is
Test Pattern 3
The procedure for displaying

described

pattern
from

is

the

in

not

to

be used during image adjustment. Test

used

to

adjust

the

Model 1 display image, and

is

used

to

adjust

the

Model 2 display image.

the

required test

paragraph 2.2.

used,

the

If

the program-generated test

test

pattern image must be keyed

keyboard. Diagrams 2-5 and 2-6 show Test

Patterns 2 and 3, respectively.

Adjustments should be performed

However, if only minor

touchup

in

the sequence listed.

adjustment

analog card adjustments can be made separately. Use

operating

the

voltage

pattern

is

required,

is

in

Diagrams
specified in the
equipment

7-1

throu~

is

required.

following

AI ignment mask:

Model 1 -
Model 2 -

PN
PN

Screwdriver (small blade)

T backpanel jumper

SL

5.2.

1.

1 Brightness

The Brightness control

Note:

OF F-PUSH switch.

7-6

to

locate the adjustments

procedu

res.

2577899 (Diagram 2-2)
2565170 (Diagram 2-3)

is

the outer knob on the

The

following

stations. The yoke shield must
makin J

2.

Short together the three test pins on analog card.
clip
HEIGHT
jumper

the

following

or

bare wire. (Pins

potentiometer

adjustments.

and

disables vertical deflection and produces a single

horizontal trace across approximate

3.

Loosen

trace

yoke

is

parallel to,

clamp and rotate yoke

or

coincides

be

on the yoke before

are

located between CHAR

SWEEP

INDIC

middle

of

until

with,

horizontal lines on

alignment mask.

4.

Ensure

that

yoke

is

firmly

seated

against CRT bell while

maintaining horizontal alignment obtained in step 3.

5.

Tighten

yoke

clamp loosened in step 3.

Use

neon.) This

screen.
horizontal

a

Adjust

as

follows:

1.

With Brightness control
image should

2.

At

full

be

visible.

clockwise rotation, raster may become visible.

fully

counterclockwise, no

Image may bloom and become excessively
comfortable viewing
fully

counterclockwise.

3. Set Brightness control
display image

5.2.1.2 Contrast

Test Pattern 1 or a customer program

Note:

for

dual brightness fields must
Contrast

control. The Contrast control

if

Contrast control (inner knob)

at

point

that

comfortable viewing.

be

loaded

to

properly adjust the

is

the inner knob on

produces best

the OFF-PUSH switch.

as

Adjust

1.

With Contrast control
between

follows:

normal

fully

counterclockwise, contrast

and

bright fields should be approxi-

matelyequal.

2.

At

full clockwise rotation, contrast should
Normal brightness characters may disappear from
if

Brightness control (outer knob)

3. Set Contrast control
desired amount

of

contrast between normal and bright

for

is

set

at a

comfortable viewing,

fields.

5.2.1.3 Focus

Adjust the Focus potentiometer
the sharpest display image. Observe
the center
screen.
entire
HV

power supply.

5.2.1.4 Yoke

1.

Place

of

the

screen

Set the potentiometer where the best focus over the

CRT

is

achieved. The Focus potentiometer

proper alignment

to

the

point

~Iosely

and those

mask

at

the

in position against face

the characters at

CRT.

Note:

Use

mask

PN

stations

and

mask

2577899

PN

2565170

to

adjust Model 1 display

to

adjust Model 2 display

bright

for

is

that

contains

be

maximum.

screen

low

level.

with

that produces

edges

of

the

is

on the

of

5.2.1.5 Magnetic Centering Rings

1.

Leave

vertical deflection grounding jumper (connected

in

step 2 of

alignment mask in place

2.

Loosen cone shield retaining screw, rotate cone counter-

clockwise

1

back

3.

Using tabs on centering rings, rotate rings
zontal

to

trace

(Geometric center

of

alignment mask. Vertical center

on the Model 1 mask and

mask.

Horizontal center

trace

to

vertical lines at

4.

Reinstall cone shield.

5.

Proceed
adjustments)

paragraph 5.2.1.4) attached

for

this adjustment.

until

locking tabs disengage, and slide cone

1-1/2 inches

to

expose tabs on centering rings.

until

passes

through geometric center

is

indicated

edges

to

paragraph 5.2.1.6 (Model 1 analog card

or

to

paragraph 5.2.1.7 (Model 2 analog

is

judged

by

crossed lines in center

is

indicated

by

line D on the Model 2

by

comparing ends

of

mask.)

of

and

screen.

by

the

hori-

line B

of

card adjustments).

5.2.1.6

Modell

Analog Card Adjustments

The procedures described in the following paragraphs apply
only

to the IBM 3277 Model 1 Display Stations.

paragraph 5.2.1.7

procedures.

alignment mask

face

of

the CRT.

Model 1

Horizontal

for

These

procedures require

(PN

2577899)

Model 2 analog card adjustment

that

be

positioned against the

Width: The vertical deflection

grounding jumper (connected in step 2

the Model 1

of

See

paragraph

5.2.1.4) should remain attached during this adjustment.

Proceed

1.

2.

3.

as

follows:
Adjust Horizontal Width potentiometer
horizontal trace on screen coincide
and E on
should
Check
through geometric center

centering rings

necessary

alignment mask. When adjusted correctly, trace

be 6.4 inches ±1/16 inch.

to

make sure

to

move trace back through center

that

horizontal trace still

of

CRT (Line B). Readjust

as

described in paragraph 5.2.1.5

so

with

vertical lines C

Remove vertical deflection grounding jumper.

that

of

ends

passes

if

CRT.

it

of

is

Checks,

Adjustments,

and Removals 5-7

Model 1 Top Margin: Adjust

that

top

trace

of

first character row falls within line A

marked on alignment mask.

Top

Margin potentiometer so

3. Remove vertical skip disabling jumper. Display image
should appear nearly normal, with inter-row spacing.
Overall image may

be

too

large

or

too

small.

Model 1 Character Height: Adjust Character Height poten-

tiometer
within line 0
overall height

Model 1

ring, and analog card adjustments, check
characters on sixth and seventh rows
at
characters
adjustments if this specification

5.2.1.7

The procedures described in
to
the
following procedures require
mask

so

that

bottom

of

alignment mask. When adjusted correctly,

of

display image should

Linearity:

center

of

alignment mask. Test Pattern 2 provides

in

these four locations. Recheck preceding

Model 2 Analog Card Adjustments

trace

of

characters

After completing

is

not

the

foil owing paragraphs apply

in

last row falls

be

3.9

inches.

the

yoke, centering

that

20th and

fall

within rectangle H

met.

21

Model 2 display stations only. (See paragraph 5.2.1.6 for

Model 1 analog card adjustment procedures.) The

that

the Model 2 alignment

(PN

2565170)

be

in

place

at

the

face

of

the

CRT and

Test Pattern 3 be displayed.

Model 2

grounding jumper (connected in step 2

Horizontal

Width: The vertical deflection

of

paragraph

5.2.1.4) should remain attached during this adjustment.

as

Proceed

1.

Adjust Horizontal Width potentiometer so

follows:

that

ends of

horizontal trace on screen coincide with lines E and G

on

alignment mask. When adjusted correctly, trace

should be

2.

Check
through geometric center of CRT (line
centering rings

necessary

10.5 inches.

to

make sure

to

move trace back through center

as

described

that

horizontal trace still passes

in

paragraph 5.2.1.5 if

0).

of

Readjust

it

CRT.

3. Remove vertical deflection grounding jumper.

Model 2 Top Margin:

1. Connect a jumper between logic board pin A

and ground (any
skip circuit, causing
display image

2.

Adjust

Top

008

pin). This jumper disables vertical

i:1ter-row spacing

to

gather toward

top

of screen.

Margin potentiometer so

to

that

lJ2M03

disappear and

top

trace of
first character row falls within center of line A (marked
on alignment mask).

Model 2 Character Height:

1. Leave vertical skip disabling jumper attached for this
adjustment.

2.

Adjust Character
trace of characters in last row coincides with
line C

on

overall height

to

line A

line

Hei~t

potentiometer so

that

bottom

center

alignment mask. When adjusted correctly,

of

display image should be 3.3 inches from

C.

Model 2

tiometer

Inter-Row

so

that

bottom

Spacing: Adjust Row Spacing poten-

trace of characters in last row falls

within line F on alignment mask. When adjusted correctly,

of

overall height
from line B

st

Model 2

Linearity:

and analog card adjustments, check

characters

image should be approximately

to

line F.

After completing yoke, centering ring,

on

12th and

13th

rows fall within rectangle M on

that

40th

alignment mask. Test Pattern 3 provides characters in these
four locations. Recheck preceding adjustments if this

is

not

specification

5.2.2

-12V Regulator Card

This adjustment should
regulator card

that

-12V

is
are made on
Model 1 display stations and

in

CRT

1.

Model 2 display stations.

Set volt-ohmmeter selector switch

met.

be performed when

is

replaced or when a voltage check shows

not

at

Its nominal value. Voltage measurements

TB

1.

TB 1 is

located on

is

under

the

right side frame

the

left side

to

a position

accurately measure 12V dc.

2.

Attach meter plus

(+)

lead to a dc return

(-)

TB1.

3. Attach meter minus

lead to

the

-12V terminal on

(-)

TB1.

4. Adjust potentiometer on

small screwdriver.

Set potentiometer so voltmeter shows

-12V regulator card.

12V.

5. Remove meter leads from

TB

1.

is

5.2.3 OFF-PUSH Switch (Model 2 Only)

This adjustment should be made after replacing the prime
power box or switch actuator mechanism. Ensure
upper chassis
chassis clamps are latched, and power
proceeding.
specified

1.

Loosen the following components:

a.

is

seated properly on

Use

Diagram

in

this adjustment.

Front

control cable clamp.

5-1

to

the

lower chassis,

is

locate

removed before

the

b. Rear control cable clamp.
c. Control wire setscrew.
d. Actuator bracket mounting screw.

2. Position control assembly flush with

the

rear control cable clamp.

3. Tighten rear control cable clamp.

of

4. Adjust actuator mounting bracket (front
center actuator over power switch plungers.

5. Tighten actuator mounting bracket.

6. Tighten front control cable clamp.

8.0

inches

and 41st

the

-12V

in

of

the

that

will

terminal on

Use

a

that

the
the

components

rear edge of

to

rear)

to

5-8

(Flush Here)

Set Screw
(Access

Actuotor

Hole For Side)

Mounting Bracket

Rear
Cable

Control

Clamp

Actuator

Center

Diagram

5·1.

7.

OFF-PUSH Switch

Pull

OFF-PUSH switch fully forward

Adjustment

position. Slider should be against

the

to

stop ring.

the

on

8. Press down and hold actuator so power switch plungers
are fully activated.

9. Tighten control wire setscrew. (Avoid overtightening
setscrew. Overtightening

cause control wire

to

will

bend and prevent proper operation.)

10. Activate

OFF-PUSH switch

to

check

that

slider remains

forward against stop ring with power switch plungers
fully depressed. Repeat steps 8 and 9

if

these condi-

tions are not met.

5.3

REMOVALS

The following paragraphs describe removal and replacement
procedures for
procedure for removing and replacing a
display station differs from the procedure used with

IBM

3277 Display Station FRUs. Where

unit

in

the

the

Modell

the

Model 2 display station, a separate paragraph describing the

unique procedure

is

presented.

All

removal and replacement

Power Switch Plungers

procedures require

accessible by the removal

the

removal of power. The

by

(2)

that

the

desired

of

necessary

top

unit

has been made

cOIIers

cover can

and made safe

be

left

on

the
display station while performing most maintenance pro­cedures. This provides a degree

of

safety by keeping

the
CRT covered.

5.3.1 Covers

5.3.

1.

1 Model 1 Cover Removal

1. Front Cover: Pull

Note: Security key must be removed from lock before

out

on bottom edge.

removing right-side cover.

2.

Side Covers: Insert a stiff card
grillwork

at

edge

of

top

cover

3. Top/Rear Center Cover: Release the four
disconnect fasteners
center cover

to

that

frame.

or

badge

in

slot

to

unlatch side cover.

quick-

hold combination top/rear

in

Checks,

Adjustments,

and

Removals 5-9

5.3.1.2 Model 2 Cover Removal

1.

Front

Cover:
underside
assembly at

bottom.

Side Covers: Security key

2.
before removing right-side cover. Pull

(under
When stud reaches
cover slightly away
simultaneously.
side covers
the

frontmost

screwdriver

3.

Top

Cover:

side covers are removed.

lower

right

top

cover back slightly

CRT

bezel. Carefully

Power Components

5.3.2

Note:

procedures
with
input

All

the

jack

power

Push

down

on latch (accessible at center

of

cover). The cover falls away

top

while

pivoting

Lift

cover

off

guide pins.

must

front

of

side cover) toward

limit

of

travel,

from

Lift

cover clear

use

a rear retainer spring

stud. Release retainer spring

in

spring and

Top

cover can be removed

and

lower

power component removal and replacement

must

be performed

cord removed

at

the

display station.

left

lift

twisting

Pull

out

of

top

to

disengage

cover

with

from

off

from

on

two

guide pins at

be

removed

pivot
base
of

display station. WTC

that

while pulling on stud.

spring-loaded knobs at

cover and

it

display station.

power turned

the wall

from

frontmost

front

of

rear

and

top

blocks travel

by

only

after both

pivot

from

guides in

or

from

display.
edge

cover

inserting

up. Pull

off

base

lock
stud

of

of

and

the

5.3.2.3

1.

2.

3. Pull

4.

5.

AC

Capacitor

Remove rubber
back on
Holding

capacitor terminals

ensure

Pull capacitor
Replace in reverse order.

wire

insulated handle

that

off

the

boot

leads.

capacitor

two

leads

from

with

is

from

spring holder.

from

top

of

metal shaft

fully

discharged.

terminals

5.3.2.4 Model 1 Prime Power Box

1.

Unplug line cord
previously removed.

2.

Unplug
box. (Three cable connectors
operator
units.)

3.

Pull Brightness and Contrast knobs
switch.

4.

Remove
frame.

5.

Replace

6.

If

and Contrast knobs

on the new one.

two

identification

the

in

reverse order.

a new prime power box

from

line cord jack

cable connectors plugged

card reader

two

screws

from

holding

is

the

of

capacitor, and slide

a screwdriver,

of

at

into

must

be

is

attached on 60-Hz

from

prime

being installed, Brightness
old

box must be installed

short

screwdriver

top

of

capacitor.

if

it

prime

removed

OF F-PUSH

power

was

power

if

box to

out

to

not

an

5.3.2. 1

1. (This step applies

2. Disconnect the

3. Disconnect

Low-

Voltage Power Supply Assembly

to

Remove shield covering

prying

through slot along

two

cable connectors plugged

wiring

from

(Diagram 7-9).

Model 2 display stations

printed

right

+5V

screw and

Note: For model 1 the wire attached

is

part

of

an

screw

be installed.

4. Remove screw holding assembly
located in center

Slide assembly

5.

6. Replace in reverse order.
installed, remove
assembly per paragraph 5.3.2.2.

5.3.2.2

1.

2.

3, Perform

-12V

Regulator Card

Lift

plastic retainer, and
socket in
card socket.

Replace card
into

5.2.2),

same

the

SMS socket.

-12V regulator card adjustment (paragraph

optional

bottom

from

machine.

-12V regulator card and replace in new

manner

by

lifting

change and

of

PC

If

pull

as

an

SMS card is removed

plastic retainer and sliding card

circuit

edge

to

board bracket.)

a new assembly

-12V regulator card

(PC) board by

of

shield.

into

+5V

return screw

to

the

+5V

mayor

frame. (The screw

only.)

board.

return

may

is

from

not

being

from

5.3.2.5 Model 2 Prime Power Box

1.

Unplug cable connector plugged

cable connectors must

identification

2.

Unplug line cord
previously removed.

3.

Remove

frame.

4. Remove assembly

5.

Replace

6.

When replacing box,
protruding

7.

linkage.
Adjust
within

pulled

is

card reader

the

two

in

reverse order.

from

position
1/32"

out.

screws holding prime power box to

from

top

of

of

switch

be

is

from

line cord jack

machine.

be

sure

of

box

box

so

body

attached on 60-Hz units.)

5.3.2.6 Model 1 Ferro Transformer (60 Hz)

1.

Unplug ferro transformer cable

circuit

wires

board.

from

ac

that

holds transformer

of

the

supply printed

2.

Unplug ferro transformer cable
power box.

3.

a

Remove

4. Remove rear screw
chassis.

5.

Remove

6.

Lift

7.

Replace

the

front

transformer clear

in

two

holding screw.

reverse order.

into

rear

of

box.

(Two

removed

that

are positioned under switch

switch plungers depress

with

that

capacitor.

machine.

if

an

if it

the

on-off

OFF-PUSH switch

plugs

into

LV

that

plugs

into

operator

was

not

switches

to

power

prime

to

base

5-10

5.3.2.7 Model 1 Ferro Transformer

,.

Unplug ferro transformer cable

supply printed circuit board.

2. Remove

3. Refer

from ferro term inal block (TB
turning cam screw counterclockwise only.
wires were terminated (for later reconnection).

4. If a card reader

from ferro terminal block

Note

nection).

5. Remove rear screw
chassis.

6. Remove

7. Lift transformer clear

the

two

wires from ac capacitor.

to

Diagram 8-1. Disconnect two wires leading

is

attached, disconnect

where wires were

that

front

holding screw.

of

mach ine.

(50

Hz)

that

plugs

into

LV

1)

to

prime power box by

Note

two

wires leading

to

card reader I/O connector.

terminated

holds transformer

(for later recon-

to

power

where

8. Replace in reverse order. When connecting wires

terminal block, cam screw

5.3.2.8

3. If a card reader

4. If a selector-pen

6. Release spring catches

8.

9. Remove screw holding ferro cover, and remove cover.

10. Disconnect

11. Remove

12. Slide transformer

13. Replace

5.3.2.9

3.

4.

Model

2 Ferro Transformer

1.

Disconnect
chassis.

2. Remove
I/O).

prime power box.

lower right rear

5. Release

upper chassis

chassis slightly
guides.

7. Lift upper chassis

chassis

Remove ac capacitor

transformers.

Model 2 Ferro Transformer

1.

Disconnect
chassis.

2. Remove all I/O connectors (keyboard, card reader,

I/O).

If

a card reader
ferro transformer cover.
If a selector-pen
lower right rear

5. Release
chassis

LV

all I/O

the

two

to

on a flat

the

two

the

two

in

reverse order.

LV

the

two

to

base chassis.

cable

is

is

of

base chassis.

to

surface.

screws holding ferro

out

cable

is

is

of

clamps

must

be

turned clockwise.

(60

Hz)

connector

connectors

attached, unplug cable from rear

attached, remove cable from clip

frame.

clamps

at

on

front

off

base chassis, and place

per

paragraph 5.3.2.3.

cable

connectors

of

housing

connector

attached, unplug cable plugged

attached, remove cable from clip in

chassis.

at

(J2) between

(keyboard, card reader,

sides

of

chassis

rear guides, and slide

to

disengage

leading from ferro

to

and

clear

(50

Hz)

(J2) between

side

of

chassis holding

that

the

two

base chassis.

of

chassis.

the

upper

upper

the

upper

base

to

two

of

at

hold

rear

two

in

6.

Release spring catches on rear guides, and slide
chassis slightly
guides.

7. Lift

8.

9. If a card reader

10. Remove screw holding ferro cover and remove cover.

11. Disconnect

12. Remove

13. Slide transformer

14. Replace

5.3.2.10 High-Voltage Power

1.

2.

3.

4. Lift

5. Replace

5.3.2.11

1. Determine which fuse

2. Replace blown fuse with

3.

4. Check

5.3.3 Analog Components

5.3_3.1

I

upper

chassis

on

Remove ac capacitor

ferro cover over ferro terminal block (Diagram 8-1),

and disconnect

to

connector
counterclockwise only.
terminaled (for

block

to

counterclockwise

minated for later reinstallation.

the

terminal block, cam screw

Disconnect
Unplug input cable
where leads are terminated (for later reconnection).
Remove mounting screw.

power

in

firmly seated

Fuses

Turn power on.

that

Note: The +8V, -12V, and 6.3V ac fuses are held

clips located on

board. Remove plastic shield over
board on Model 2 display stations

The ac line fuse
the prime power box. The +5V and +34 V fuses are

located at:

+5V (Model 1):

(Model 1):

+34V

+5V (Model 2):
+34 V

(Model 2):

CRT

DANGER
All

persons handling a CRT or
CRT under vacuum must wear safety glasses
long-sleeved garments.

to

front

to

disengage

chassis

a flat surface.

the

prime power box by turning cam screw

in

anode

supply clear

reverse order. Ensure

in

fuse does

off

base chassis, and place

per

paragraph 5.3.2.3.

is

attached,

two

wires leading from terminal block

on

ferro cover by turning cam screw

later reinstallation).

two

wires leading from ferro terminal

only. Note

two

screws holding ferro

out

of

reverse order. When connecting wires

lead from CRT.

at

lower edge

of

CRT bell.

is

not

the

LV

is

located

A/F

A/F2
01

elF 1

01

C/F2

remove access cover

Note

where

housing and clear

must

be

Supply

of

machine.

blown.

another

blow again.

1

fuse

power supply printed-circuit

in

a screw-type fuse holder

I

who

the

where leads were

leads are ter-

to

base chassis.

turned

HV

assembly.

that

anode lead

of

same value.

the

LV

to

replace these fuses.

Diagram

Diagram

are

near an exposed

upper

two

upper

of

chassis.

clockwise.

in

power supply

7-3.1

7-5.1

rear

on

to

Note

is

fuse

on

and

Checks,

Adjustments,

and

Removals

5-11

The yoke and shield assemblies are
To

remove the CRT from the display station, proceed as

removd<l

with

the

CRT.

follows:

Model 1

1.

Disconnect power cord

at

display station (under front

cover).

2.

Remove left, right, and

3. Remove mask/bezel assembly
captive knurled head screws

top

covers (5.3.1.1).

by

that

loosening the two

hold assembly

frame.

4.

Carefully disconnect CRT anode lead. Static charge
may be present.

5.

Using an insulated jumper wire, momentarily ground

CRT anode terminal

6. Disconnect yoke cable from analog card, and

to

discharge static charge.

discon-

nect ground wire(s) from yoke shield.

7.

Remove cone shield from base area of CRT:

a.

Loosen cone shield retaining shoulder screw.

b.

Rotate cone counterclockwise until locking tabs

disengage.

c.

Pull

cone straight back and clear of CRT neck.

8. Remove socket from base of

9. Open new CRT carton and place pad
close

to

display station so

when

old CRT

is

removed.

CRT.

that

a safe place

on

firm surface

is

available

CAUTION
The following steps free

the

CR

r trom its mounting.

The tube weighs about 4 pounds. Protect and support
CRT from excessive pressures that could cause damage
to

the CRT or other components.

10. Remove

top

two CRT holding nuts, and remove

grounding spring.

11. Loosen the bottom two holding nuts.

12.

Connect lifting strap
mounting ears.

(It

the threaded studs and

(PN

2565197)

may be necessary

to

to

slide CRT off

tilt it forward to attach strap

top

CRT

to

mounting ears.)

13. Remove bottom two holding nuts.

14.

Carefully slide CRT and yoke assembly toward front of
display station and clear of unit.

15. Place

CRT face down on pad.

16. Note approximate orientation of yoke with reference
to

CRT.

17. Loosen yoke and shield retaining clamp and carefully
slide assembly off CRT neck.

18.

Install yoke and shield assembly on new CRT

location noted

19.

Install new CRT

in

step 16.

in

reverse order, ensuring

grou nding spring (step 10) and yoke sh ield grou

that

in

CRT

nd

wire(s) (step 8) are reconnected.

20. Perform

all

Model 1 display image adjustments (5.2.1

through 5.2.1.6).

Model 2

1.

Disconnect power cord

at

display station (under front

cover).

2.

Remove left, right, and

top

covers (5.3.1.2).

3. Remove Contrast and Brightness control knobs.

4. Mark position

of

power control actuator assembly on

left side rail.

5.

to

Remove
screws.
other attaches

6. Remove power control actuator
lower

7.

On units with security keylock optional feature:
a.

the

two power control actuator mounting

(One screw attaches assembly

to

front frame.)

left CRT holding nut.

Mark location

of

keylock assembly mounting

to

assembly

bracket on front frame.

b.

Remove screws holding bracket

c.

Place keylock assembly aside

to

frame.

to

expose lower right

CRT holding nut.

8.

Carefully disconnect CRT anode lead. Static charge

be

may

9.

Using an insulated jumper wire, momentarily ground

CRT anode terminal

present.

to

discharge static charge.

10. Disconnect yoke cable from analog card, and discon­nect ground wire(s) from yoke shield.

11. Remove socket from base of CRT.

12. Remove cone shield from base area of CRT:
a.

Loosen cone shield retaining shoulder screw.

b.

Rotate cone counterclockwise until locking tabs

disengage.

c.

Pull cone straight back and clear

13.

Open new CRT carton and place pad on firm surface
close

to

display station so

when old CRT

is

removed.

that

of

CRT neck.

a safe place

CAUTION
The following steps free the CRT from its mounting.
The

tube

weighs about 16 pounds. Protect and support
CRT from excessive pressures
to

the

CRT or other components.

14. Remove

top

two

CRT holding nuts, and remove

that

could cause damage·

grounding spring.

15. Loosen bottom two holding nuts.

16.

Connect lifting strap

(PN

2565197)

mounting ears.

17. Remove bottom two holding nuts.

18.

Carefully slide CRT and yoke assembly toward rear of
display station and clear

19. Place

CRT face down on pad.

of

unit.

20. Note approximate orientation of yoke with reference
to

CRT.

side rail;

to

is

available

to

top CRT

the

expose

5-12

21. Loosen
slide assembly

22.

Install
location noted

23. Install new CRT
grounding spring (step 14)

yoke

and shield retaining clamp and carefully

off

CRT neck.

yoke

and shield assembly

in

step 20.

in

reverse order, ensuring

and

yoke

wire(s) (step 12) are reconnected.

24. Perform

(5.2.1

5.3.3.2 Yoke and Shields

The

yoke

as

neck

be separated.

Note:

removed before cone

all

Model 2 display station image adjustments

through 5.2.1.7).

and shield assemblies are removed from the CRT

a unit. After

Top

cover

the

assemblies are removed,

on

Model 2 display station

sh ield can be moved back

CRT filament.

1.

Disconnect

ground wire(s) from

2. Remove socket from base
stations

it

is

yoke

cable from analog card, and disconnect

yoke

shield.

of

CRT. (On Model 1 display

necessary

to

perform step 3 before socket

can be removed.)

3. Remove
a. Loosen
b.

cone

Rotate

shield from base area

of

shield retaining shoulder screw.

cone

counterclockwise until locking tabs

disengage.

c.

Pull

cone

straight back and clear

4. Note approximate orientation

of

of

yoke

CRT.

5. Loosen
slide assembly

6. Separate yoke from

7. Replace

in
screw shouid

yoke

and shield retaining clamp and carefully
off CRT neck.

shield.

in

reverse order. Position

step

4. (Yoke cable should be
be

on

left side as viewed from

yoke

at

display station.)

that

8. Ensure
is

in

contact
by pressing
tightening

9. Perform

grounding spring (fingers)

with

the

conductive coating

yoke

assembly toward face

clamp screw.

all

display image adjustments (5.2.1.4 through

5.2.1.7).

5.3.3.3

Modell

Analog Card

CAUTION
Perform

HV

power supply check (par. 5.1.3.5) before

installing a new analog card. Premature failure

analog card may result if power supply

1.

Unplug connectors

2. Loosen

the
card and into wire form. (These
knurled

heads and a spacer

at

top

of

analog card.

two

captive screws passing through analog

two

on

them.)

on

new CRT

that

shield ground

they

must

to

observe

CRT:

CRT neck.

with reference

on CRT

bottom,

as

and clamp

top·front

on

front

of

of

the

CRT bell

of

CRT before

of

is

defective.

screws have large

in

CRT

can

be

to

noted

of

yoke

new

3. UnpJug

bottom

connector.

4. Remove analog card from machine.

5. Remove

the

two

screws

and

spacers from old analog

card.

6. Reassemble screws

7.

Plug in

bottom

and

spacers in new analog card.

connector.

8. Replace analog card in machine.

Note:

The

two

open

slots

in

the

card

must

fit

into

the

slots

rear edge

in

the

rear leg

of

the

of

form.

9. Tighten

10. Plug in

11. Perform
and 5.2.1.7)

the

two

captive screws.

two

top

connectors.

analog card adjustments (paragraphs 5.2.1.6

if

a new card

is

installed

or

adjustments were disturbed.

5.3.3.4 Model 2 Analog Card

CAUTION
Perform

HV

power supply check (par. 5.1.3.5) before

installing a new analog card. Premature failure o'f

analog card may result if power supply

is

defective.

1. Open logic gate.

the

two

2. Remove

shield, and lift

3. Unplug cables plugged into

4. Remove

the

upper screws supporting analog card

off

shield.

front

of

analog card.

two

screws holding analog card

chassis.

5. Remove analog card from support.

6.

Unplug rear connector.

7.

Replace in reverse order.

8. Perform

new card

5.3.3.5

The

power box

these

5.3.2.4

analog card adjustments (paragraph 5.2.1.7) if a

is

installed

Modell

Brightness and Contrast controls are

on

Model 1 display stations. Do

controls; replace prime

for

prime power box replacement procedure.

or

if

the

adjustments are disturbed.

Brightness and Contrast Controis

part

power

box. See paragraph

ot

not

the

5.3.3.6 Model 2 Brightness and Contrast Controls

1.

Unsolder

the

three leads

on

each

of

the

two

tiometers. Note terminals from which wires are removed,

for

later reinstallation.

2.

Pull

the

two

knobs

off

3. Remove rear-most C
slider bracket

4.

Pull

off

to

potentiometer

large retaining clip

concentric

clip

control

on

slider bracket

shaft.

that

holds potentiometers

shafts.

that

mounting bracket.

5. Lift

assembly clear

of

unit

from rear.

analog

the

if

to

prime

replace

poten-

retains

wire

the

;:

a'b

base

to

Checks, Adjustments, and Removals

5-13

6. Assemble in reverse order.

7.

Turn

power on.

8. Check

5.3.3.7 Power Control Switr:h

The
it
must

prime

5.3.2.5 for

procedure.

5.3.4

5.3.4. 1 Logic Card

1.

2. Pull

3. Pull logic

4. If card

5. Place card in

6.

7.

5.3.4.2 Logic Board

1.

2. Remove

3. Remove

4. Remove all cables on pin side

5. Remove plastic

6. Remove

7. Remove all socket-head screws with clamps

for

proper

operation

power

control

is

necessary

be replaced. See paragraph 5.3.2.4

power

logic

Turn

power

out

disengage

logic board.

is

card

and

Push card
sure card seats

Turn

power

Tum

pO\Ner

positions.

capacitor
wires were terminated,

labeled with

presence

Note terminations.

Note positions

board

to

switch

to

replace

box replacement procedure

the

Model 2 prime power box replacement

Components

off.

on

the

two

card

from

board.

card

from

being changed, remove card holder

install it on new

socket

guides.

on

logic

board

firmly, with a snap,

on.

off.

all cards from board

decoupling capacitor from clip, and remove

wires from

their

pin assignments.

bumper

of

Keyboard

voltage buses

for

re-installation.

gate.

of

is

part

of

the

switch,

handles

socket

evenly and perpendicular

card.

pins. Do

the

two

for

later reinstallation.

(yoke assembly). Check

Feature

from

board with cables attached.

both

controls.

the

prime

power

the

prime

power

for

the

Model 1

or

paragraph

on

plastic card holder

from

not

bend pins. Make

in

socket.

to

be

replaced, noting

board pins. Note where

of

board. Cables are

Jumpers (Diag. 6-10).

that

box.

8. Remove board from machine while unplugging connec-

tors plugged

9. Replace

replace wires, cables,

and

pins

10. Rewire Keyboard Feature

feature was present.

in

card side

in

reverse order.

to

replace logic cards in proper sockets.

of

and

connectors

board.

Be

extremely careful

on

Jumpers

onto

correct

board

new board

5.3.5 Keyboard Components

This section describes procedures
keyboard
are
paragraphs
and paragraphs
Type
following

5-14

components.

common

B.

Ensure
equipment

to

Type A and

5.3.5.6

Paragraphs 5.3.5.1

through

5.3.5.9

that

may be required:

5.3.5.8 apply only

through

the

correct

to

remove and replace

through

Type

B keyboard assemblies,

5.3.5.11 apply only

procedure is used.

to

5.3.5.5

Type

Key

top

puller

tool

I sopropyl alcohol

(lint-free)

If

box

to

to

old

Cloth

5.3.5.1 Keyboard from Display Station

1.

Turn

power off.

2. Remove display

3. Disconnect

4.

Remove keyboard cable
Model 2 display stations, I/O cable retainer must
unhooked
display stations,

5. Replace

6. Ensure

sockets

5.·3.5.2 Keyboard Top Cover

1.

Turn

2.

loosen
bottom

in

that

and

keyboard over.

the

pan.

station

keyboard

to

release keyboard

nylon

reverse

all

I/O cable

that

ground straps are

four

3. Place keyboard upright

4. Lift

top

cover

off

5. Replace

5.3.5.3 Keyboard Assembly from Bottom

1. Disconnect

graph

Remove keyboard

2.

Disconnect keyboard cable

3.

4. Remove
to
screws.)

5.

for

hold

to

if

A,

to

The

Lift

6.

Replace

7. Ensure

5.3.5.4 Audible Feedback Assembly

1. Disconnect keyboard from display station. (See para-

graph 5.3.5.1.)

Remove keyboard

2.

Note:

blies. The logic card
socket.
with steps

3. Disconnect
assembly

access

4.
keyboard

5.

in

reverse

keyboard

5.3.5.1.)

the

four fasteners

mounts. (Type A assemblies use nuts;

keyboard assembly

in

reverse

that

cable

connector

The

audible feedback device consists

To

remove

3 and 4.

the

at

connector
(blue wire). On
horizontally,

Remove

Replace

to

leads.

the

bottom

in

reverse

it

two

is

PN

9900373

75475,

PN

2200200 (or

transport
PN

2108930

or

PN

cleaner -

(preferred),

627953

IBM

PN

(or

tissue -

2123106)

front

cover.

cable

ground

connector

cable

order

0

connectors

captive screws in

on a flat

keyboard.

order.

from

top

cover. (See paragraph 5.3.5.2.)

connector.
that

off

mounts.

order.

top

cover. (See paragraph 5.3.5.2.)

is

removed by pulling

the

audible feedback assembly, proceed

two

leads

positions 8 (white wire)

assemblies where logic card

necessary

screws

pan.

order.

strap

from

chassi~

from

its socket.

connector.

clamp

must

attached.

corners

surface.

display station. (See para-

hold keyboard assembly

is

firmly seated.

from

to

remove card

that

hold relay assembly

On Model 1

be removed.

are firmly seated

of

keyboard

Pan

Type

of

two

it

out

audible feedback

is

socket

PN

tape

453511)

PN

011

be

in

B use

assem-

of

its

and

mounted

for

to

9

5.3.5.5 Keybutton

A keybutton should

appearance

or

when
stem. Buttons are removed
over the key

top

be

replaced when

it

fails

to

remain attached

by

sliding the key top puller tool

and pulling straight up.

it

deteriorates in

5.3.5.6 Type A Switch Module

Steps

1-3

must be performed in the order listed before

removing the switch module.

1.

Disconnect keyboard from display station.
graph 5.3.5.1.)

2.

Remove keyboard

top

cover.

(See

paragraph 5.3.5.2.)

3. Remove keyboard assembly from bottom

paragraph 5.3.5.3.)

Switch Module Removal (Except Spacebar Switch

A.

Module):

1.

Record locations

module

(PN

keybutton

as

others

2. Take the

needed

two

containing new module,

inside face
brackets away from locking channels on plastic

case

of

old module (Diagram 5-2).

3. With

flat

portion

tools in this position, grip shouldered

of

pull switch module straight out.

of

keybuttons in

area

5995542) being replaced. Remove

from

faulty

module (and from

to

provide

work

space).

small, flat, pointed tools

and

slip one down the

of

each

D bracket (retainer)

switch module plunger

with

to

the key

(See

para-

pan.

(See

of

switch

as

many

from

box

to

force

pliers, and

4. The black plastic lead frame package
when

the

plunger assembly

is

removed. Usinp
solderwick (PN 5151439), unsolder and
excess
printed
frame package from printed

solder from the fou r terminal

circuit

board (Diagram 5-3). Remove lead

circuit

gram 5-4).

15-Watt Soldering Iron

is

left

behind

remOVE

pads

board (Dia-

on

CAUTION
In the next step, do
for

longer than

necessary

not

apply the soldering iron

to

flo·"" the solder.

Lead Frame Terminal Pads

Diagram 5-3. U nsoldering Lead Frame

lead

Frame

Package

Terminals

(Type

A)

Diagram 5-2.

Switch

Module

Removal

(Type

A)

Diagram 5-4. Lead Frame Removal

Checks,

Adjustments,

(Type

A)

and Removals

5-15

Note:

distorted during
it back
squeezing
seat firmly against the sides of

If

the

switch mounting frame becomes

removal

to

its normal position. This can

the

0 brackets together until they will

of

the

old module, form

the

be

done by

new module

housing.

B.

Switch Module Replacement:

Do

not

disassemble
replacement module. Lead frame and plunger
assemblies

follows:

as

1.

Check
boss on bottom

(Diagram 5-5). If it
that
boss. Compress and rotate spring until

expands around boss.
should be parallel

Note:

check the
not bent and
of

are matched during manufacture. Proceed

that

return spring

of

is

firmly seated on spring

plunger

is

of

new switch module

not, invert switch module so

lead frame terminals are up. Place spring on

last coil

When

properly seated, spring

to

long axis

When

the plunger return spring

lead frame terminals

that

they are parallel

of

switch module.

is

to

see

that

to

the long axis

in

they are

the switch module.

place,

2.

Insert module into keyboard switch mounting
frame, with orientation arrow on top of
pointed
modules (Diagram 5-6).
sure
bottom

terminals extend through

in

the same direction

As

as

module

plunger return spring seats on raised boss on

of

mounting frame and

holes

in

board.

Diagram 5-6. Switch Module Orientation (Type A)

module

arrows on other

is

inserted, be

that

the four

printed-circuit

Lead Frame

Terminals

Diagram

5·5.

,/

I(

I I

Switch Plunger

I~Spring

I
I

) Plunger

Return
Spring

Boss

Return

Spring POSitioning (Type

A)

Once new module

is

in

place, check for

the

following conditions:

• Plunger moves freely.

•

Top surface of module

modules.

other

• 0

brackets on mounting frame lock module

firmly

in

place.

Note: Should

module

careful not

it

be necessary

to

correct any of these conditions,

to

mar any portion

is

even with those of

to

remove the new

of

the plunger,

be

since operation of the module and/or retention
of the keybutton

would be affected.

CAUTION

In

the

next step, do not apply soldering iron for

longer than necessary

3.

Solder terminals
amount

of

solder.

of

to

flow the solder.

lead frame.

Use

a minimum

4. Reassemble key buttons on switch modules. Check
to

see

that

correct keybuttons are returned

to

correct module positions.

Install the assembly on the bottom pan, replace

5.
keyboard

top

cover, and reconnect keyboard

to

display station.

5-16

5.3.5.7 Type A Spacebar Assemblies
Type A spacebar assemblies consist

(PN

5995544) and the spacebar switch module (identical

other

switch modules). The spacebar group comprises
spacebar,
modules. Replacement
removal
removals

the

torsion bar, and

of

any spacebar part requires

of

the spacebar and torsion bar. Perform the

in

paragraphs 5.3.5.1 through 5.3.5.3 for access

of

the

spacebar group

the

two spacebar guide

the keyboard assembly.
A.

Spacebar Removal:

1.

Grasp torsion bar near one end with thumb and
forefinger (Diagram 5-7) and flex it upward, snapping
it forward

out

of

retaining lugs on spacebar guide

module.

2. Swing loose end of torsion bar upward, and disengage
it from other spacebar guide module.

3.

Lift

spacebar straight up

out

of

spacebar guide

modules. This exposes spacebar guide modules and

spacebar switch

module.

to

the

to

5.

If spacebar switch module

switch

module as described

is

to

be replaced, remove

in

paragraph 5.3.5.6A,

steps 2 through 4.

B.

Spacebar Replacement:

1.

If spacebar switch module

procedure described

in

is

to

be

replaced, use

paragraph 5.3.5.68, steps 1

through 3.

If spacebar group

2.

is

to be replaced, insert new
spacebar guide modules into mounting frame;
careful
to
modules firmly

Insert spacebar guides

3.
drop spacebar

4.

Holding torsion bar
insert end

the

to

have torsion bar retaining lugs positioned

front.

Be

in

in

place.

of

torsion bar

sure

that

D brackets lock

place.

in

spacebar guide modules, and

at

a suitable angle and position,

in

the hole

in

one spacebar

guide (Diagram 5-8). At the same time, engage torsion

bar with retaining

torsion bar

to

lugs

on guide module. Lower

horizontal. Flex it as during removal,
and insert other end simultaneously into hole
spacebar guide and into retaining lugs on other guide
module.

5. Operate spacebar
freely and

to

see

that

switch module operates

that

torsion bar and spacebar guides

bind.

6.

Replace keyboard

to

display station.

top

cover and reconnect keyboard

in

do

be

gu

ide

other

not

Diagram 5-7. Torsion Bar Removal

4. If spacebar group
guide modules

as

step 2. (See Diagram 5-8).

(Type

is

to

be

explained

A)

replaced, remove spacebar

in

paragraph 5.3.5.6A,

Lift

module straight

with thumb and forefinger.

8ernoval
Toot

Diagram 5-8. Spacebar Guide Module Removal

(Type

A)

out

5.3.5.8 Keybutton Support Modules - Type A Keyboards
Only

The longer keybuttons, 1-3/4 and 2-3/4 units long,
A keyboard

utilize support modules

PN

5995543 and

·on

Type

PN

5995547, respectively.

A.

Support Module Removal:

1.

Remove keybutton(s)

to

provide adequate work

space.

2.

Take the two small, flat, pointed tools from box
containing new
of

each D bracket (retainer)

from

locking channels on plastic case

With

3.

flat tools

portion

module, and slip one down inside face

to

force brackets away

of

old module.

in

this position, grip shouldered

of

support module plunger with pliers, and

pull old module straight out.

B.Support

1.

Module Replacement:

Check

that

return spring
boss on bottom
it

is

not, invert module, place spring on boss, and

of

plunger of

is

firmly seated on spring

nfi!W

support module. If

compress and rotate spring until last coil expands
around boss.

2.

Insert new module into keyboard switch mounting

top

of

frame, with orientation arrow on
housing pointed
modules.

As

in

same direction as arrows on other

module

is

inserted, be sure plunger

module

Checks, Adjustments,

and

Removals 5-17

return spring seats on raised boss on bottom

of

mounting frame.

Once new module
moves freely,
extend above other modules, and

mounting frame have locked module firmly

3. Reassemble key buttons
that

correct keybuttons are returned

that

is

top

in

su

on

place, check

rface of modu

that

Ie

that

D brackets on

plunger

does not

in

switch modules. Check

to

correct

place.

module positions.

5.3.5.9 Type B Module

Steps

1-3

must

be

performed

removing the module.

working
module flyplate and the

problem. Before keyboard disassembly, prepare a smooth,

on

the keyboard.

printed

in

Cleanliness

Any

particle between the key

circuit

the order listed before

is

important when

board

is

a potential

clean work area by wiping contamination away with a

lint-free cloth dampened with isopropyl alcohol. Gently

tap, brush, and shake the keyboard assembly

most loose particles

that

could get into the

to

PC

board and

remove

flyplate area during disassembly and reassembly.

1.

Disconnect keyboard from display station. (See para·
graph 5.3.5.1.)

2. Remove keyboard

top

cover. (See paragraph 5.3.5.2.)

3. Remove keyboard assembly from bottom pan. (See
paragraph 5.3.5.3.)

A.

Module Removal (Including Spacebar Module):

Diagram 5-9. Screw Loosening

6.

Lift

the all-keys assembly from the circuit board,
and place
up)

the

assembly right side up (keybuttons

in

the

clean area. Handle the all·keys assembly
by the sides (Diagram
depress any keys while removing assembly, since a
flyplate could detach.

(Type

B)

5-10).

Be

careful not

to

Note: See paragraph 5.3.5.10 for spacebar removal if

spacebar module

1. Ensure
inate

the

is

to

be replaced.

that

all

small particles

that

might contam-

keyboard assembly are removed from the

work area.

2. Record locations of keybuttons

that

is

being replaced. Remove key button from
faulty module and from as many others as may
required

to

provide enough work space. '

3. Place keyboard assembly upside down

in

area

of

module

in

be

the
cleaned area, and loosen the screws holding base
plate and circuit board

(Diagram

5·9).

Do

to

the all-keys assembly

not

remove the holding screws

at this time.

to

slide

expose

4. Place keyboard assembly right side up, and
one corner off

the

work surface edge
one holding screw. With fingers, remove hblding
screw from bottom.

5. Carefully rotate keyboard assembly and remove
remaining holding screws, one
all-keys assembly and

PC

at

a time. Keep the

board together.

Circuit Board and Electronics Assembly

Diagram

5·10.

Keyboard

Note: Replace

comes off.

Do

Assembly Separation

the

key module

not

attempt

to

(Type

repair the module.

Repaired modules can cause intermittent failures.

B)

if

the flyplate

5-18

7. Raise

8.

the

module

key
down on

out

snaps

edge of

the

of

the

all-keys assembly nearest the

to

be replaced

shoulder

the

retaining plate (Diagram 5-11).

about

of

the

key module until it

Select either removal method, a

is

most conven ient.

a.

Lift

the

all-keys assembly, leaving behind the
defective key module.
assembly

b.

Lift

defective

rightside up

the

all-keys assembly, leaving behind the

module. Place the all-keys assembly

upside down, either

Place the all-keys

in

the

on

the existing system

or

clean area.

keyboard mounting hardware and brackets or
on prepared supports (such
or

standoffs).

B.

Module Replacement:

1.

Observe orientation

Ensure

that

in

the

same position as

in

the

all-keys assembly.

Install new module

2.
the

all-keys assembly over

Sa

step
the

key module

the

from

the

alignment

(PN

was used for removal)

in

the

bottom (if step

as

blocks of wood

of

the

new key module.

lug

and keystem are

the

rest of the modules

1772948) by lowering
the

new module (if

retaining plate by hand

8b
removal).
Clean the printed circuit board (Diagram 5-12)

3.
and key module

flyplates by carefully wiping
each with a lint-free cloth dampened with
isopropyl

remove flyplates from key modules.

4. Align
plate,

alcohol.

the

PC

board, insulator, and

8e

careful

not

holding screw holes through base

top
present). Diagram 7-18 shows the correct
locations

of

these components. Lower the

all-keys assembly into place.

5. Carefully slide one corner of the keyboard
assembly off

the

work area edge, and install
one holding screw finger tight. Rotate key­board assembly carefully, and install remaining
screws finger tight.

6. Turn keyboard assembly upside down, and
all

tighten

7.

Turn keyboard assembly rightside up, and
reinstall keybuttons

holding screws with a screwdriver.

in

proper locations.

8. Manually check operation of each key module.

9. With an ohmmeter, check for continuity

between
pin

008.

the

base plate and

The

two

KB

base plate grounding studs

(Diagram 5-13) must contact the

ground circuit.

10. Install

the

keyboard assembly on the bottom

pa

n,

replace keyboard

reconnect keyboard

top

to

the display station.

1/4

inch. Press

b,

below,

or

by snapping

was used for

to dislodge

insulator (if

1 connector

PC

board

cover, and

that

or

Diagram

5-11.

Module

Removal

Circuit

Diagram 5-12.

Diagram 5-13. Base Plate G rou

Board and

(Type

B)

Electronics

nd

Studs

(Type

Assembly

Ground

B)

(Type

Stud

B)

(2)

Checks,

Adjustments,

and Removals

5-19

5.3.5. 10 Type 8 Spacebar
Perform the removals described

through 5.3.5.3 for access

A. Spacebar Removal:

1.

Grasp spacebar button
of

the

modules) and remove by applying even upward

force.

2.

Pivots can be removed
the tip
the side

of

a screwdriver placed

of

the

to

the

keyboard assembly.

at

each extreme end (outboard

(if

pivot (Diagram 5-14).

in

paragraphs 5.3.5.1

required) by prying with

in

the

molded slot

in

1.

Clean

the

work area and prepare the keyboard.

steps

1-3

of paragraph 5.3.5.9.)

2. Disassemble keyboard.

5.3.5.9A.)

3. Reassemble keyboard.

5.3.5.9B.)

5.3.6 Audible Alarm (Optional Feature)
The audible alarm device circuitry

metal box mounted on
inside the front cover. The audible alarm box

vertically

Model 2 display stations.

1.

2.

3. Remove circuit board from

4. Remove cable wires from audible alarm circuit board
with long-nosed pliers

5. Replace
color code

on

Model 1 display stations and horizontally on

Remove front cover.

Remove audible alarm box from chassis. Box can be
removed from snap fasteners by rocking metal box while
pulling away from chassis.

in

reverse order. Circuit board

of

wires

(Use

steps

(Use

steps

is

the

base chassis beneath

the

metal box.

or

small blade screwdriver.

to

be replaced.

3-6

of

2-9

of

packaged

is

etched with

(Use

paragraph

paragraph

in

a small

the

CRT,

is

mounted

I Diagram

B.

5.3.5.11 Circuit Board and Electronics Assembly - Type B

The circuit board and electronics assembly
replaceable unit on Type B keyboards. To remove or
replace
as

5·14.

Spacebar

Spacebar Replacement:

1.

Snap any pivots removed

mounting frame.

2.

Place spacebar button over its respective modules,
and lower it into position while engaging the
stabilizer bar

3. Apply downward pressure on spacebar
directly over spacebar modules to seat
button.

4. Check spacebar operation for binds.
present,
right module stem. This stem can be straightened
eliminate the bind.

5. Replace keyboard
to

display station.

Keyboards Only

the

circuit board and electronics assembly, proceed

follows:

Pivot Removal (Type B)

in

the

two pivots.

the

most common problem

top

cover, and reconnect keyboard

in

step 2 (above) into

at

the points

the

If binds are

is

a slightly bent

is

spacebar

a field-

5.3.7 Security Keylock

5.3.7. 1 Model 1

1.

Remove screws that hold keylock assembly

2.

Release cable clamps

logic board.

3. Remove cable leads from connector
Note positions from which wires are removed (for later
reconnection) .

4.

Lift

switch cable assembly free

5.

Reassemble in reverse order.
removed
positions and
in right side cover.

to

5.3.7.2

1.

Remove screws

2.

Remove keylock assembly cover.

3. Remove cable leads from switch with pliers
screwdriver. Note terminals from which leads are
removed (for later connection).

4. Remove cable strain relief from hole

5. Remove cable from keylock assembly.

6. Reassemble
assembly with hole

in

Model2

in

step 3 are replaced

that

(Optional Feature)

that

route switch assembly cable

of

keylock assembly

that

hold keylock assembly

reverse order. Make sure

in

right side cover.

to

at

socket A 1 Z3.

machine.

Make

sure

in

proper connector

is

aligned with hole

to

in

switch assembly.

to

align keylock

frame.

that

frame.

or

to

leads

small

5-20

5.3.8

Selector Ught-Pen (Optional Feature)

5.3.8.1 Model1

from

base

of

1. Remove screws
remove cable.

2.

Unplug feature cable from logic board cable

3. Unscrew nylon

center

rear

4. Remove screw

and

ground wire

5. Slip cable

of

out

cable

board

and

to

of

slotted

clamp

assembly.

retainer

rear

selector light pen holder;

screw

that

that

clamps routing cable

of

chassis.

hole

at

center

6. Replace in reverse order. Make sure

reconnected

so

slot

7. Position light-pen cable

from holder

to

chassis, and

that

extra insulation

to

cable

end

that

on

in

pen holder

of

pen is

,cable is positioned in

cable

about

holds cable

rear

of

that

ground wire

acts

as a grommet.

so

that

30

socket

chassis.

distance

inches.

Y 4.

to

not

aids are

CEMs,

5A.1

Ceaning

The importance
keyboards
the

key module flyplate and

potential problem.

5.4.1. 1 Work

Before beginning any keyboard disassembly, prepare a

is

smooth,
with a lint-free cloth dampened with isopropyl
Gently
remove most loose particles
and flyplate area during disassembly and reassembly.

intended

or

other

published

cannot

A,.

clean work area

tap,

brush,

to

replace

data.

of

cleanliness when servicing

be overemphasized.

and

shake

by

that

the

existing procedures,

Any

the

printed

wiping

contamination

the

keyboard assembly

can

get

particle between

circuit board

into

the

Type

away

alcohol.

PC

board

B

is

a

to

5.3.8.2 Model 2

1.

Remove screws from base

remove cable.

2. Unplug feature cable from logic board cable

3. Release cable from cable clamps
bottom

of

chassis.

of

selector light pen holder;

socket

that

route

cable

Y

4. Disconnect ground wire from frame.

5.

Slip cable

chassis.

Replace in reverse order. Make sure cable

6.

cable clamps so

grommet
Make sure

7. Position light pen
from holder
inches.

5.3.9

1. Disconnect card reader cable ground strap from chassis.

2. Remove card reader cable
Model 1 display stations, nylon cable clamp
removed. On Model 2 display stations,

retainer

3. Replace in reverse order.

4. Ensure
sockets
ground terminal.

out

of

slotted hole

that

extra

where cable passes through hole in chassis.

that

ground

to

Operator Identification Card Reader (Optional

Feature)

must

be

that

all

and

that

wire

cable

cable

end

unhooked

I/O cable

all grou nd straps are attached

at

bottom,

is

insulation

is

reconnected

in pen holder so

of

pen

connector

to

release cable connector.

connectors

on

cable acts as a

to

is

approximately

from its socket.

the

are firmly seated in

right, rear

positioned

frame.

that

distance

must

110

cable

to

chassis

30

On

5.4.1.2 Keyboard Assembly

Before reassembling
circuit board and key module flyplates

4.

cleaned by wiping each with a lint-free

to

with isopropyl alcohol.
remove flyplates from key modules while cleaning. Replace,
rather than
flyplate separates from

of

5.4.2

in

Some minor liquid
sugar, can be removed by first
affected
mixture
water-dampened, lint-free cloth. Finally, clean with lint-free
cloth dampened with isopropyl

Note: Sticky key modules

spill may necessitate replacement
assembly.

5.4.3

be

Two

types
module and a new
currently
modules
to

3277

mittent

attempt

Uquid

Spills

fly plates with a lint-free
of

water and mild hand soap.

Key Modules

of

in

use

must

display stations. These modules can cause inter-

errors.

the

keyboard assembly,

Be

to

repair,

the

spills, such as

must

key modules,

"super

on

Type

not

be used

must

cloth

careful

module.

"washing"

alcono!.

slick"

B keyboards.

on

keyboards

not

to

the

key

module if

soft

drinks

or

the

cloth

dampened with a

"Rinse"

be replaced. A severe liquid

of

the

entire

the

original "black

white

body

Super

that

the

printed

be

carefully

dampened

dislodge

coffee with

PC board and

module, are

are attached

or

the

with a

keyboard

body"

slick key

5.4 TYPE B

The

Symptom
Diagrams
tions.
in

this

keyboard faults. This section provides miscellaneous main-

tenance aids

KEYBOARD

Index

in

Chapter 4 isolate

The

check

chapter

to

MAINTENANCE AIDS

in

Chapter 3

and

removal procedures presented earl ier

provide detailed instructions

supplement

and

the

Troubleshooting

Type

B keyboard malfunc-

the

existing procedures. These

for

repairing

5.4.4 Contamination Shields

Some keyboards have foam
a 1.S-mil protective membrane/shield
contamination from entering
during customer use. The presence

of

the

function
shown

in

Diagram 7-18.

EC level

strips, foam side insulators, and

the

PC

board

of

of

the

keyboard.

Checks. Adjustments, and Removals 5-21

added

to

prevent

and

flyplate area

these shields

The

shields are

is

a

5.4.5 Protective Membrane/Shield
When removing a key

protective

shield, care must be taken

shield when snapping

module from a keyboard with the

out

the defective module.

5.4.6 Ground Check
There

should

grounding studs (Diagram 5-13) and

on

the

ohmmeter connected between the

ground pin,

be

continuity between the two base plate

PC

board. Grounding can

008,

at

the

interface signal connector,

the
be

base

5.4.7 Ground Loop Isolation
Nonconductive inserts have been added

holding
base plate and

assembly. With
the 3277, check
assembly

screws on some keyboard assemblies

PC

board

dc

ground from

the

keyboard assembly disconnected from

to

ensure

that

the

base plate and all-keys

are

not

electrically shorted.

not

to

puncture

dc ground circuit

checked with an

plate and

KB

to

the base plate

to

isolate

the

all-keys

the

the

1.

the

5.4.8 Crooked

Key

module stems can
crooked
to

tighten loose key tops.

or

looking key top. The keystem ears can be widened

Loose

Key

tops

be

formed left

or

right

to

align a

5-22

Section 6. Reference Data

This section contains miscellaneous reference information

that

can

be

helpful in maintaining

IBM

3277 Display

Stations.

CONTROLS

6.1
Controls are divided into two categories: external and

internal. External controls are those
without remov

ing

covers. I nternal controls are those

are under covers and are accessible

nel

only. The audible alarm volume control, although

located under

control because

the

front cover,

the

display station operator can adjust

that

are accessible

to

maintenance person-

is

considered an external

that

the

volume.

6.1.1 External Controls (Diagram

6.1.1.1 OFF-PUSH (Power, Brightness, and Contrast)

The OFF-PUSH switch
adjusts

the

display image brightneS5 and contrast. I t also

is

controls display station power. Pulling

CRT

Bezel

6-1

)

a triple-function control

the

switch

Indicators

that

out

(3)

toward

overall displayed image
Brightness control (outer knob) clockwise;
made dimmer by rotating
Contrast control (inner knob)
the
clockwise reduces
and normal intensity characters; rotating
counterclockwise increases

6.1.1.2 Security Keylock (Optional Feature)

This operator control

key must
position)
key must remain

station enabled.

unless it is returned

6.1.1.3 Selector Light-Pen Tip Switch (Optional Feature)

the

operator turns display station power on. The

is

made brighter by rotating

the

knob counterclockwise.
is

on a concentric shaft with

Brightness control. Rotating

the

difference in contrast between high

the

is

a key-operated switch lock. The

be inserted

to

enable

the

in

the

The

key cannot

to

in

the

lock and turned

display station for operation. The

On position

the

Off

the

difference

be

removed from

position.

Contrast control

in

to

keep

the

image

the

contrast.

on

(horizontal

the

the

the

The

control

display

lock

The selector light-pen contains a spring-loaded switch in its
tip. The switch

is

used

to

select detectable fields

on

the

is

OFF·PUSH

OFF-PUSH Switch
(Power/Contrast/Brightness)

Diagram 6-1. External Controls

and

IBM

CRT

Indicators

SYSTEM

AVAILABLE
INSERT

MODE
INPUT

INHIBITED

Security Key

Reference Datil 6-1

screen by placing
field and pushing

Removing

the

the

point

the

barrel

tip from

the

of

of

screen

the

pen

the

pen toward

on

turns

the

the

desired

the

switch

automatically.

6.1.1.4 Audible Alarm Volume (Optional Feature)

The loudness

display station operator by turning

volume control.
to

the
protrudes downward from
right side

the

control protrudes frontward from

box

on

6.

1.1.5 Keyboard Audible

A knob
the volume
Volume can
depressed)

6.1.2

of

the

audible

tone

can be adjusted by

the

The

front

cover must be lowered for access

control. On Model 1 display stations,

the

audible alarm box

of

the

base chassis. On Model 2 display stations

the

the

left side

at

the

to

of

the

upper chassis.

Response

rear of

of

be

adjusted from

the

keyboard

the

keyboard audible response device.

bottom

off

(no click when a key

maximum loudness by rotating

Internal Controls

audible alarm

the

audible alarm

plate adjusts

the

knob.

data

screen.

off

the

control

on

the

is

spacing between character rows and, thus, determines
overall height
control

6.1.2.6

This control
located
reference line
image adjustments are made.
reference line remains stationary during

is

TOP

on

not

of

the

displayed image. The

used

in

Model 1 display stations.

MARGIN

is

a screwdriver-adjustable potentiometer

the

analog card.

on

the

CRT, from which all

The

Once

ROW

control sets

other

the

control

other

SPACING

the

vertical

is

set,

vertical

character and image adjustments.

6.1.2.7 Image

The deflection yoke, mounted

tilt

the

the

image for squareness with

6.1.2.8 Magnetic Centering Rings

The magnetic centering rings are mounted
neck, directly behind
rings are rotated
geometric center

Tilt

on

the

CRT neck, is used

entire displayed image. Rotating

the

edges

the

deflection yoke.

to

position the displayed image

of

the

CRT.

the

of

yoke

the

CRT bezel.

on

The

adjusts

the
centering

about

the

top

the

to

CRT

the

6.1.2.1

This momentary-contact switch

INTEN

CRT

is

located

on

the

display

station analog card. The switch overrides intensity and

blanking
complete raster

6.

1.2.2 Focus

This control
located
the sharpness

pulses generated by control logic and causes a

of

on

scan lines

is

a screwdriver-adjustable potentiometer

the

HV

power supply. Turning

of

the

dots

to

be displayed when pressed.

the

control varies

that

form

the

characters on

the

screen.

6.1.2.3 WIDTH

The WIDTH control

tiometer located

the

varies
total width

6.1.2.4 CHAR

This control

located

vertical

horizontal dot-to-dot spacing, which alters

of

the

HEIGHT

is

on

the

dot-toodot spacing

Model 1 display station, it determines

the

displayed image.

6.1.2.5 ROW SPACING (Model 2 Display Stations Only)

This control

located

on

is

the

is

a screwdriver-adjustable poten-

on

the

analog card. Turning this control

displayed image.

a screwdriver-adjustable potentiometer

analog card. Turning

of

the

the

control varies

displayed image. On

the

overall height

a screwdriver-adjustable potentiometer

analog card. Turning

the

control varies

the

the

of

6.1.29

This control
located on
the

6.2
Display

categories: external and
those
covers.
removed.

-12V Supply

is

a screwdriver-adjustable potentiometer

the

voltage

-12V regulator card. Turning

output

of

the

-12V power supply.

the

INDICATORS

indicators, like controls, are divided into two

internal. External indicators are

that

can be seen

To

observe internal indicators, covers must be

without

removing any machine

Internal indicators are accessible only

maintenance personnel.

6.2.1 External Indicators (Diagram 6-1)
The three external indicators on

displayed as

small boxes (blips) generated by analog

circuitry. They are displayed

at

3277

Display Stations are

the

right edge

Each indicator has its function identified by a

CRT bezel, adjacent

indicators

6.2.1.1 SYSTEM A

is

controlled by

This indicator
display stations and
stations.
signifies
control

In remote system configurations,

that

unit

(TCU)

is

displayed

the

carrier

to

the

indicator. The brightness of

the

Brightness control.

VAILABLE

at

character row

is

online when lighted.

Indicator

at

character row 4

is

on

and

lOon

Model 2 display

that

the

In

control sets

of

the

CRT.

label

on

on

Model 1

the

indicator
transmission
local system

to

the
the

6-2

configurations,
channel 'operational

6.2.1.2

INSERT

This indicator
display stations and
stations.

the

on
station

keyboard

is
remains on, and
until

the

6.2.1.3

INPUT

This indicator

display stations and
stations. The
the

display station from

Operator Identification Card Reader

and

indicator
the

RESET key. When

the

indicator being

out'

MODE Indicator

is

displayed

at

character row

The

indicator lights when

is

pressed.

in

the

Insert mode

the

display station remains in Insert mode

RESET key

is

pressed.

INHIBITED

is

displayed

at

character row

tag line

is

active.

at

character row 6

12

the

It

signifies

of

operation.

Indicator

at

character row 8

14

lighted indicator signifies

the

keyboard, selector light pen,

is

extinguished by program control

the

security key lock

on

signifies

on

Model 2 display

INSERT

that

The

on

Model 2 display

that

manual input

is

blocked.

or

that

the

on

Model 1

MODE

key

the

display

indicator

on

Model 1

The

by pressing

is

off, this

to

indicator lights.

Internal Indicator (SWEEP INDIC)

6.2.2
The SWEEP INDIC indicator

is

a neon bulb mounted

on

the display station analog card. The lighted indicator

that

the

signifies

horizontal deflection circuits are oper-

ating.

6.2.3 Arc-Suppression Neon

a~c-suppression

The

board

in

Model 1 display stations and on
distribution board
indicator and will never be seen lighted. The

the

neon bu

of
and

the

display station frame ground. The neon acts

momentary short circuit whenever

neon

is

located

in

Model 2 display stations. It

Ib

are connected between de ground

on

the

the

difference

arc-suppression

the

two

voltage

is

not

an

elements

(R

ET)

as

in

poten­tial between its two elements would have exceeded approx.i­mately 90V. The difference

the

generated by

to

tube

arc. Arcing causes transients

inherent characteristic of a cathode-ray

the tube. Restricting potentials

in

potential

to

in

the return path

90V

to

ground protects

is

occasionally

of

display station circuitry from possible damage.

KEYBOARDS (Optional Feature)

6.3
Four keyboards are used with

Keyboards

of

the

same type are interchangeable among

321"1

Display Stations.

display stations having keyboard adapter circuitry installed.
EBCDIC

is

the basic code used

on

all keyboards.

6.3.1 Types

6.3.1. 1 Typewriter Keyboard

of

Keyboards

The typewriter keyboard uses a standard typewriter key

of

66

layout

be

may
Diagram 6-2 illustrates

6.3.1.2 Operator Console Keyboard

The operator console keyboard uses an

keys. An additional 12 Program Function keys

incorporated

in

the

standard typewriter keyboard.

the

typewriter keyboard.

IBM

1052-7

key layout with an additional 12 Program Function keys.

the

Diagram 6-3 illustrates

6.3.1.3 Data

The two data

Entry

entry
alphameric keys and
trates the two data

EBCDIC Keyboard Codes

6.3.2
The

EBCDIC

entry

code

operator console keyboard.

Keyboards

keyboards use

30

control keys. Diagram 6-4 illus-

66

keys, consisting

keyboards.

is

the standard code used with
system keyboards. Diagram 6·5, sheet 1, shows the key­board codes for the typewriter and operator console
keyboards.
Graphics column

Characters (and functions) are shown

as

they appear on typewriter keyboard
key tops. The operator console keyboard key layout
similar. Sheet 2 shows the EBCDIC code arrangement used
on the data entry keyboard(s). Diagrams 6-6 and 6-7 show

ASCI

I and

WTC

the codes for unique

6.4

ASCII OPTIONS

ASCII*

character generator and keyboard options may be

present on

available only

a

3277

Display Stations. ASCII options are

in

the United States and Canada. The

language characters.

following paragraphs describe the characteristics of these

options.

6.4.1

ASCII Character Generators (Optional Features)

Two

ASCII

character generator options allow
code set
symbols [,
EBCDIC code set. ASCII option A uses

-',

to

be displayed.

],

\ , and

The

ASCII code set includes

"which

are

while option B substitutes

not

used

in

the

symbols I and

the

symbols ! and 1\

respectively. Each option requires a different character

-ASCII

American

change, X3.4-1968.

National

Standard Code

for

Information

type

of

all

3270

in

the

ASCII

the 3277

Inter-

36

the

is

the

Reference Data

6·3

generator
display
option;
same

6.4.2

Two
3277
writer
unique
keys
keyboards

tionally

but

installed
Option
symbols
provides

logic card in

station

is

not

however, if logic

type

number

ASCII Keyboards (Optional Features)

ASCII

typewriter

Display

Station.

keyboards

ASC

II

characters

1-12

are included

location

affected

card

must

keyboards

Tt-ey

described

are

card

in

are serviced like EBCDIC keyboards,

they

are

the

same. Unique logic

ASC

II

character

to

enter

A provides

I (logical or)

the

64

and

the

ASCII

generator

display

64

ASCII

and

character

(exclamation point) for logical

logical

not.

K2. Maintenance

by

the

presence

K2

must

be changed,

be

used.

can

be

attached

are

similar

in

paragraph

included

the

to

EBCDIC type-

6.3.1.1,

on

some

78-key version. ASCII

cards

option A or B must

the

unique

character

-,

(logical

or

ASCII characters.

set

not).

set

but

and 1\ (circumflex)

of

of

the

ASCII

to

except

key

tops.

and

opera-

are

not

used,

including

Option

substitutes

the

the

the

PF

be

the

B

for

6.5 REFERENCE

Diagrams

6· 7 through
be helpful
Display

foldout

station

page located
6-8 lists all logic cards used
describes
used as

the
probe

(Section 4) are listed

in

maintaining

data

function

points

DIAGRAMS

6-14

contain

flow

is

at

the

of

each card.

in

the

in

Diagram 6-9. ALD references are

reference

IBM

3277

shown

back

in

of

this manual. Diagram

in

the

display station and

All

troubleshooting

Display Stations.
Diagram

logic

data

card

also listed. Logic board jumpering data for the various
keyboard

Diagram 6-11 shows

feature

options

how

is

included

characters are

in

Diagram 6-10.

encoded
keyboard assembly. Diagrams 6-12 and 6-13 show logic
card plugging for
respectively. Logic board pin identification

the

one-half and two-thirds boards,

data

Diagram 6-14.

!

that

FO-l,

I/O pins

diagrams

in

is

given

can

a

the

in

Diagram 6-2. Typewriter Keyboard

8

§)

@

@

CDCDCDCDwCDCDGJGJm

0000080GJG0wB

B000000008GJGJ

G000000GCJCJwG

(

.un

J ) (

Diagram

6·3.

Operator Console Keyboard

Typamatic Keys

CD . 880GO

@8

["',,)

GOG

GGG

8GB

Reference Data

6-5

Data Entry Keyboard- Keypunch Layout

8

Q

~

~

~

c:JwGJCDGJ

ERASE

INPUT

r+\ommnmmmmm8r-=-l

lQj~WL!Ul!Jl!J\JUwww

~nl>\(T\mA0\mmm

~WWWWUUl!UWWUJ

r=::-lnm("\f=\mmmmm

L::JWWWWWl!UV!JWLJ

( ) )

Data Entry Keyboard

8

Q

~

~

~

c:JGJGJCDCD

r+\0m"

lQj~

~f<\l>\nmAmmmm

~WWWWUUl!UWWUJ

r=::-l(%"\mn~mmmmmo~

L:::-JwW

neD"

E L!U T

W W W

:~:

GOCIJBGGG

ENTER

~

GG

r::::lG

~

Gt:l

Pf4

U

~

L.::.-J

:~:

GOmGGG GG

f=\mmmmGr-=-l

l!Jl!UWWW

PF4

~

G

PF5

l!UV!VWLJ

. L.::.-J

r::::lG

~

DEL

DEL

(

'BET

J ) (

• Typamatic

Diagram 6-4. Data Entry Keyboards

Keys

[ENTER)

o Numeric Keys

Typewriter

ERASE
ERASE EOF
RESET

DUP

CLEAR

INS MODE

DEL

TEST

FIELD
ENTER

Space

t

.j.

-+
+-

~

14-

I

•

#

$

"

C

&

+

a

w

E

R
T

y

U

I

o

P

I
A

5

o

F

G
H

J

K
L

z

x

c

V

B

N

M

and

INPUT

REa

MARK

(2

Keys)

Graphic

U

<

>

?

PF1
PF2
PF3
PF4
PF5
PF6
PF7
PF8
PF9
PF10
PF11
PF12

*Typamat,c Key

Notes:

Diagram 6-5.

1.

Typewriter Keyboard

2.

Use

USA

Operator Console Keyboard Codes

L

PA1

PA2

1

2

3

4

5

6

7

8

9

o

a

w

E
R

T

y

U

I

o

P

....,

A

S

D

F

G
H

J

K

L

z

x

c

V

B

N

M

button

layout used. Character codes are same on

Diagram 6-7

EBCDIC Keyboard Codes (Sheet 1

to

determine the codes for unique ASCII and

Upper

Shift

o 1

234

5 6 7 P •

000101111
000

1 0 1

100

100

1 1

1 0 1 0 1 0 •

001

101

000

000

000

101

001

101

0 1

001 1 000

100
100
100
101
1 0 1 0 1 1
1 0 1 1 0 1
101

of

2)

100

1

100

101

0 1 •
1 0 •

10·

1 1 1 0
1

000

1 0

0 1

010

0 a 1 0

1 1 1 0

1 0

010

0 1 0

1 0 0
1 1 1
000

1 1 0

0 0

0 1

0

001011011
000100011
000100000
001100001
10011
00111

o 1 0 0 0 0 0 0 0 •

000
000 1 100
000 1 100
000110100·
000"0,,,·
000 1 001
000101001

o 1

01111
011110111

o 1 0 1

011011001

010010100

o 1 0 1

010111001
010011011

o 1 0 1 1 1

011011010·
010011101
110110001

111001100

110001011

110110010
111000110
111010001

111001001
110010011

110101100.
110101111
010110101
1 1
111000101
110001000
110001101
1 1
110010000
110100011
110100101
1

011110100

o 1 1 1 1 1 1 1 0

111010010
1 1 1 0 0 1 1 1 1
110000111
111001010
110000100
1
110101001

o 1

011011100

o 1 1 0 1 1 1 1 1

001
001
001
001
001
001

001

001 1 100
001110011

001 1 101

001110110
001111001

Lower

o 1

000101111
000

1

00101
00101
000100011
000100000
001
001011101
001

o 1 0 0 0 0 0

000
000110001·

000 1 100
000110100·

000 1 101
000 1 001
000
111 1 000
111
111100111
111101000
111101011
111101101
111101110
1

111110011

111100001
011000001·
011111101
100 1 100
10100

1 0 0 0 0 1 0 1 0
100110011
101
101010000
10100

1

100
100 1 011
010111111
1 0 0 0
101
1 a 0 0 0 1
100001100
100001111
1
100 1 000
100 1 001
100100111

010111100
011111011

101010011
1 0 1
1 a 0 0 0 0 1 1 0
101001011
100
100
100

o 1

010010111
011000010

001100010

001
001

001

001

001

001

001

001 1 100
001

001 1 101

001

WTC

language characters.

Shift

234

5 6 7 P •

1 0 1

1
101

100

1 1

101

1 0 1 0 1 0 •

1 0 1

100

111

1 0 0 0 0

1

000

1

000 1 001

1 0 1

000

000

00

0 1 0 0 0 1

001

000

1 0 1
1 0 1

101

0 1 1 0

100
100
101

101

101
101
1 1

000

1 1 0

1 1

100

both

keyboards.

100

000

0 0 1

00·

1 0 •

1 1 •

10·

001

1 0

1 a 0

0 0

101

1 1 1

000

101

1 0

1 1
1 0 0
001

1 0

0 0

1 1 0

1 0 1

011
000

1 0 0
1 1 1

000

011

101

1 1 0

1 1

101

1 0

1

0

0

0

1

R

.....

ce Date 6-7

Data

Entry

U

ERASE INPUT

ERASE EOF

RESET

PA1

CLEAR
INS MODE
DEL

TEST REO

PA2

ENTER

Spec:e

SKIP

DUP

t

'"

+-

(2

.....

~

PA3

o

+

1

2

3

a

<

>

....,

~

..

5

6

?

"

(

)

7

8

9

Keyboard

Gl'lIPhic

Keys)

Codes

@II

#

$

I

a

w

E

R

T

y

U

I

o

P

A

S

o

F
G
H

J

K

L

Z

X

C

V

B

N
M

Upper

Shift

o 1

234

L

000
000101100

001011000

o 0 1 0 1 1 0 1 1

000100011
000 1 000
001100001

o 0 1 0 1 1 1 0 1

o 0 1 1 1 1 0 1 0
o 1 0 0 0 0 0

000 1 001

1 0 0 1 1 1 0 0 1
000
000110001·
000 1 100
000110100·
000110111·
000 1 001
000

o 0 1 0 1 0 1 1 1

o 1 0 0
o 1 0 0 0 0 0 0 0

o 1 1 0 1 0 1 1 0

o 1 0 0 1 0 1 1 1

1 1 1 1

o 1 0 0 1 1 1 0 1

o 1 1 0 1 1 0 1 0

o 1 0 1 1 0 1 0 1
o 1 1 1 1 0 1 0 0
o 1 0 1 1 1 1 0 0

o 1 1 1 1 1 1 0 1

1 1 1 1

1 1 1 1 0 0 1 0 0

1 1 1 1

010100001

o 1
o 1 1 0 1 1 1

o 1

o 1 0 0 1 1 1 1 0

o 1 0 1 1 1 1 1 1

o 1

1 1 1 1 0 1
1 1 1 1 0 1 0 1 1
1 1 1 1

o 1 1 0 1 1 0 0 1
o 1 1 0 1 1 1 1 1

o 1 1 1 1 1 0 1 1
o 1 1 1 1 1 1 1 0
o 1

o 1 0 1 1 1 0 1 0

1 1 1 1 0 1 1 1 0

1 1 1 1 1 0 0 0 0

1 1 1 1 1 0 0 1 1

o 1 0 0 1 0 1 1 1

011000001

5 6 7 P •

1 0 1 1 1 1

1 0 1 0 1 0 •

1 0 1

001

000

00

0 0 1

000

00

1 1 1

001 1 000

000

0 0 0 0

001

0 1 0 0

000

0 1 1 0 1

001

1 0 1 1

0 0

00·
10·

1 0 •

10·

0 0

1 0

00

Lower

Shift

o 1

234

5 6 7 P •

000

1 0 1 1 1 1

000

1 0 1

100

00101

o 0 1 0 1 1 0 1 1

000 1 000
000
001100001

o 0 1 0 1 1 1 0 1

o 0 1 1 1 1 0 1 0

o 1

000 1 001

1 0 0 1 1 1 0 0 1
000
000110001·
000 1 100
000 1 101
000110111·
000 1 001
000

o 0 1 0 1 0 1 1 1

o 1 1 1 1 1
o 1 1 1 1 0 1 1 1

o 1 0 1 1 1 0 0 1

o 1 0 1 1 0 1 1 0
o 1 1

1 1 0 1 1

1 1 1
1 1
1 1
1 1 1
1 1 1 0 1
1 1 1
1 1
1 1
1 1 0 1 0 1 1 1 1
1 1
1 1 1
1 1
1 1
1 1
110010000
1 1 0 1

1 1 0 1 0 0 1 0 1

1 1 0 1 0 0 1 1 0
1 1 0 1 0 0 1 0
1 1 1 0 0 1 1 1 1
1 1
1 1 1
110000100
1 1 0 1 0 1 0 1 0
1 1 0 1 0 1 0 0 1

o 1 1 0 1 0 1 1 0

o 1 0 0 1 0 1 1 1

o 1

011000001

1

000

1 1

1 0 0 0 0 0

000

0 0 0 0 •

10·

1 0 1 0 1 0 •

1 0 •

00·

10·

1 0 1

001

000

000

0 1 0

000

00

1 1 0 0

000

1 0 1 1

0 1 1 0 0 1 0

000

1 1 0

000

00

1 0 0 1
0 0 1 0 0 1 1
0 1 0 1 1 0 0

000

001

000

1 0 1
000 1 000
000

1 1 0 1

000

1 1 1 0

000

1 1

000

0 1 1 1

0 0 1 0 1 0

00

1 0 1 1 1

1

1

0

PFl
PF2
PF3
PF4
PF5

FIELD

MARK

*Typamatic

Note: Use Diagram 6-6

key

to

Diagrmn 6-5. USA EBCDIC

determine

Keyboard

the

Codes

codes

(Sheet 2 of

for

001

100

001100100

o 0 1 1 0 0 1 1 1

001101000

o 0 1 1 0 1 0

1 0 0 1 1 1 1 0 0

unique

0 1 0

1,1

WTC

language characters.

2)

001

100

101

0 1 0

000

001100100

o 0 1 1 0 0 1 1 1

001

o 0 1 1 0 1 0 1 1

0 0 1 1 1 1 0 0

1

Data

Entry

Language

Key
Graphic

Key
Graphic

Key
Graphic

Key
Graphic

Key
Graphic

Key
Graphic

Keyboard

Codes

USA
EBCDIC

$

$ U

#

# A

@
@

!
!

..

..

4

t

Austrian!
German

U

..

A

0

0

X5A

U

X7F

A

X4A

0

Belgian!
French

$
$

:#

#

@
@

!

I

..

..

4
4

Danish!
Norwegian

l

"-

k

Ii,

(2J

(2J

X5A

Finnish!

Swedish

l
l

A :#

A

0

0

X5A

l l

X7F

k A

X5A X4A

(2J

X7F

b ¢ A

Italian

$
$

:1!

@

@)

!

I

..

..

4

Portuguese

~

Spanish

Pts

~

'0
'0

A

A

X5A

~

X7F

N

N

@ @
@

N

'0 N

X4A

4:

United
Kingdom

f..

Pt

f..

:it

:#

@

I

!

I

!

..

..

$

4

$

Keyboard
Code

01234567P

010110110

011110111

01

11 1 1000

010110101

01

1 1 1 1 1 1 0

010010100

Diagram 6-6. WTC Language

Typewriter

Language

Key
Graphic

Key
Graphic

Key
Graphic

Key
Graphic

Key
Graphic

Key
Graphic,

Key
Graphic

Key
Graphic

Key
Graphic

Keyboard

Codes

USA
EBCDIC

$ $

$

#

:#

@
@

!

I

..
..

•

4

I
I I

-.,

---,

USA USA
ASCII·A

$

:#

:#

@

@

I I
I I

..

..

r

f

I

---,

---,

Keyboard

ASCII-B

$

$

::::

@

(f.u

..

..

I
I

A
A

::

[

f

Codes

(Data

Entry

Austrian!
German

U

(Shift)

U

'j,.

(Shift)

A

o

(Shift)

0

U
U

A

A

0

a

I J

I I

----,

----,

X6A
(None)

Keyboard)

Belgian!
French

$
$

:r

:::

@
@

I

!

. .

..

4:

¢

--,

--,

Danish!
Norwegian

a

(Shift)

a

A:

(Shift)

k

o

(Shift)

0

a

.a

~

~

0

Ql

I I I

I

--,

---,

Finnish!
Swedish

l

(Shift)

l

A

(Shift)

A

o

(Shift)

0

R

a

A

Ii.

0
0

I I

--,

--,

Italian

$

s

:;:

::

(!')

(n)

I

I

..

--

t

t

---,

--,

Portuguese

~

(Shift)

~

'0

(Shift)

0'

A(Sh.tt)

A

~

~

'0

"0

A

A

I
I

--,

---,

United

SPJOISh

Pts
Pt

N

(Shift)

N

to)

,u:

!

1

N o 1 1 1 1 1 1

N

4

4

I

I

----,

---,

Kingdom

f.

£

:;:

=

lll'

(ftl

I
I

.-

S

$

I
I

---,

---,

Keyboard
Code

01234561P

0101

101

0111

101

1 1

01

1 1

o 1

01

10101

010010100

() 1 001

0101

1 1 1 1 1

01

10

10101

1 1 1

10

1 1

U

(j

()

10

()

Diagram

6-7.

ASCII

and

WTC Language

Keyboard

Codes

(Typewriter

Keyboard)

Reference

Data

6-9

Location

*A2
Keyboard

*B2
Keyboard

C2
I/O Gating

02

(Modell)

480

Storage

and

Name

Controls

Controls

and

Parity

and

- 2

- 1

Gate

Type

9072

9069

9066

9057

Logic Page
Reference

KMl11-161

,

KM011-071

MG011-061

MB011-061

Function
Major

Tests
characters
protected
Contains
operation
control

or

Units

for

mod ified

and

data.

keyboard

latches, Load.

latches,

Input

Keybd
Reset;
Index; I/O Unlock Decode; MDT Load Bit 7.
Keybd; Allow Char

and MDT latch.

Contains
Tab

KB

controls, Cursor

Controls, and

decoder,

KB
Alpha

Shift;

Insert/Delete

Controls.

Contains
buffer
parity

message

register

check
circuits, late
reg ister,
register,

attribute
and

and

CR

Bits
1-7;

0--9; Load I/O

Load Message Buffer.

gating circuitry

buffer

for line

and

message buffer.

Modell

- Contains

FQ
480-character Serial
message

buffer

Shift

and gates.

Significant I/O Signals

Strobe;

Busy;

1-7,

Strobe.

Keybd

and

P;

NumeriC

CU

Bits

Shift;

KB

Bits0-9;SR

3-11;

KB

Fets

Bits

Out

Bits Bits

Data;

Ser in Bits

Shift

0-9;

Gt;

Fets.

Output

KB

lock; FF Enable; Ld

KB

to

Fets;

Char

KB

Op

Decoder

Char

Edit;

Op

Complete; I nsert Bit

9;

Csr Move; Keybd Bits

Csr

outputs;

Edit;

1-7.

FQ

Ser in Bits

Bfr Bits

2-6;

Fets

Out

0-9;

1-9;

Attb

P Chk Bfr.

Bits

0-9.

Rdy

Mesg

Reg

02

(Model 2)

960

Storage

E2

SE

R DES

Circuits

F2

960

Storage

G2

I/O Control

and

and

Special

and

Gate

Gate

9065

L514

9065

9068

MB011-061

KA111-121

MB111-161

KA011-081

Model 2 -

Contains

Ser in Bits

0-9.

TQ
960-character message
buffer

and

gates.

Contains
and

I/O serializer/
deserializer Bits
(SE

line driver Data

line receiver,

ROES) and gates,

to

Control

Unit;

to

Driver

Data
Receiver; Mesg Bfr

1-9;

3-7;

Keyb bits

Data.

Data
Data

SR

to
from

Bits

Control

1-12;Osc.

Unit;

Driver Receiver;

oscillator, and
5V relay switch.

Third

Quarter

Model 1 ­Model 2 ­960

Not
Contains

character

message buffer

used.

and

in Bits
card

02);

0-9

(from

Shift

Serial

Fets.

Fets

Out

Bits 0--9.

gates.

Contains
decoder,
controls,
register, SE ROES
controls,

operation
I/O gating
status

and

cursor

Osc,

End

Fets

Out

SR Bits

1-12;

from

Driver Receiver;

Attention

Screen;
Bit

7-8;

Data

Stop

Clock; Index;

Alarm; Write Latch;

System

Ready

Control

Word 1

inputs. Clock; Data; I

Latch;

and

nput

positioning controls. Device Busy; Read

Xmit

Check; Read

Shift;

Data

to

Receiver;
Input
I/O Data;

Driver

CU

Busy;

Inhibited; Load

Protected

Sound

2;
Data;
Sync;

Out

Bfr.

*OPtional

feature

Diagram 6-8. Logic

6-10

cards

Card

Data

(Sheet 1

of

2)

Location

and

Name

Type

Logic Page

Reference Major

Function

or

Units

Significant I/O Signals

Input

Output

H2

and

Clock

J2
Display Control

K2

Line Buffer
Character

Step

and

Generator

Control

9071

9067

9058

(M1)

9070

(M2)

KF01'-07'

KFll'-18'

MC011-091

Contains
character
buffer
controls,
attribute

Contains
counter,
counter,
analog
and
display indicators. Horiz

Contains

line
register, line
buffer,
character
and
for analog.

dot

counter,

counter,

shifting Load Late Reg; Last

and

buffer

register. Ones;

retrace
line
row

counter,

controls,

controls

buffer,

data

to

gates

to

ROS

ROS

generator, Ind; Lines

serializer

Osc; Read
Set

Line. Char; Char

Step

Retrace

0-9;

Inhibited;
Ready; Insert Mode. Fets;

Fets
Shift
Blank
Output;

Out

Shift;

I/O

Fast

Shift;

Retrace

Ctr;

Blank; Lines

Csr Line;

Out

Line Buff;

CRT

Input

System

Bits

2-9;

at

Video

Unblank Display

0-8.

Interface
Ctr;
Next

Unformatted

Normal Gates; High
Intensity,

Blank;

Numeric Field.

Set

First
Gates;

Buff; Ld

CRT

Row 0;

0IIIt;

R

Unblank;
Vertical Retrace;

Bump
Shift

Pre ROS Bits 2, 3,
7;

Bits

from

Video

Op

Step

Dot

1-8;

to

Last Char; Last

Ctr

Fast

Shift

Display;

Non

Unprotected

Blank

for

9 Lines; Ld

Shift

Line

Atb

Reg

Step

Row

Sync;

Blank

at

Video

Row

1;

E nd Screen;

Shift

Display; Serial

GT.

4,

5,

6,

Line Buffer;

or

Hi

Data

Out.

Retrace

Char

0;

All

Latch;

Disp

Char;

Retrace;

LB

from

Ctr;

Output;

Last

Fets;

and

and 8

Non

Inten;

I

!

!

:

I

L2
(Not Used)

"M2
LP

Control

"N2
Card Reader card reader interface

·Optional

Diagram

feature

cards

6-8. Logic Card

Data

9088

2229

(Sheet 2

KT011-061

KR011-071

of

2)

Contains

light-pen interface
and
circuitry.

Contains

and
circuitry.

selector I/O Busy; Bits

control

magnetic

control

6,

and 8 from
Buffer; Pre ROS
bits

2,

3,

and

7.

0-7;

Keybd

Keybd

CR Data;
Bits
Parity Bit.

4,

Line

5,

Bit 7

and

LP

Busy;

3,4,

5,

Strobe;
Pty;

Gate

LB

and

LP

Aid Bits

and

6.

Bits

0-7;

Keyboard.

MB;

Reference

Data

6-11

Card

Pin

ALO

Signal Name

Card

Pin

ALO

Signal Name

A-A2

A~2

A-C2

A-E2

DE

Up

B04
G04

*Ml0

P05 KM131 - Load Late

503

*509

512

U04
U06

G03
G09

Jl0

M03
*M10
*Ml1

P06
*S02
*S05
*S08
*509
*513
*U05
*U09

U13

P04 MG051
*502

503

*B02

B09

B12

J13

KM141
KMll1
KM141

KM141
KM141
KM141 +
KM141 +
KM121 - I nsert Mode

KM041
KM021 ­KM041 ­KM031
KM031
KM031
KM031
KM031 +
KM031
KM031
KM031
KM021
KM031 +
KM031
KM011

MG051
MG041

KA111
KAlll
KA121
KA121

+

-

Ld

KB

-

Keybd

-

Keybd

-

Keybd
KBTune
FF

Enable

-

Fill

Hole

KB

Attn

Clr

Norm
+ Erase Fld 6
+

Keybd

+

Keybd

- Set

EAU

Keybd

+

Keybd

+

Keybd

+

Keybd

+

Keybd
Keybd

+ Keybd

- Insert Csr

+POR

-

POR

+ P Chk

+ Relay Coil
+ Switched

+ 2.385 MHz

+ 4.770

Shift

to

Fets

Strobe

Reg

Lock

Reset

Lock

Gt

Bit

5

Bit

7

Lth

Bit

3

Bit

0

Bit

1

Bit

2
Parity
Bit

4

Bit

6

Bit

Bfr

5V

MHz

Lth

Osc
Osc

7

Bit

9

Gt

KB

A-H2

A-J2

A-K2

A-M2

B03
006

013
G03
Gl1
G13
J02 KF051

J09

MOO

M13
P06 KF031
Pl0

U06

B04

Bl0
GOa

M08
P04
502
505

509
512
S13
U02
Ul0

P11

S09 MC091

*004

P09

*U06

KF071
KF071
KF021
KF071
KF041
KF061 + High

KF051 +
KF051
KF031

KF021
KF021

KF131
KF131
KF161
KF151
KF181
KF151
KF141

KF141

KF171
KF171
KF141
KF141

MCOal

KT041
KT051
KT051

+

Null

Bet Cur and End

+

Numeric
Dot

·

Field

6

+ Unprotected Char

-

Shift

Fets

Intensity

+

Unformatted
Normal

+ Fast

Shift

- Char

-

Next

+ Blank

- Late

- Cond Fets

+

Ld

LB

- Unblank Ind
Screen

- End

Up

Line

+

+ Last

Row

+ Blank

Output

- Force Unblank Line

·

Bump

Gates

All

Ones

To

Last Char

For

Reg

Strobe

Gates

CRT

Display

Disp

Latch

First Frame

Bit

8

at

Video

+ Vertical Retrace

+ Dev Check

+

Horiz

Sync

+

Non

Dis

Or

Hi

+ V ideo Data

·

LP

Strike

Draw Bars

-

-

LP

Sw

Inten

Out

Closed

Lth

A-F2

A-G2

*Input

M02

B09

*Bl0

*007

G04
G07
G09
J05'
J13
M06
P02
504
506
509
510

pins

MB141 + Fets

KA081
KA071
KA061
KA081
KA071
KA061
KA081
KA071
KA061
KA021
KA031

KA031 - Syst
KA071 ­KA061

Diagram 6-9. Probe Pin

Data

Out

Bit

9

+ Insert

Null

-

Clr

Insert Csr Latch

- Security
+ Delete Csr

- Protected

- Device Busy Status

- Insert Cursor

- Set

1/0

Key

Bfr

Fast

Bit

9

Norm

Shift

+ CU Busy
+ Index

- Delete

-

Op

in Process

Input

MDT

Rdy

Inhibit

Lth

Bit

Set

7

Dot

6-12

Feature Name Feature Number

Jumper

TypewritQr and Operator Console 4630, 4632, 4633,
Kevboards 2955

Data

Entry

Keybons

Kevboard

Nurruric

(USA English,

UK

Lock

English,

4631,2973

4690

Finnish, and Swedish)

Keyboard

Num

..

ic

Lock

4690

(Austrian, Belgian, Danish,
French,

German,

118lian,
Norwegian, Portuguese, and
Spanish)

·00

not

add

this

wire

if

Diligram 6-10.

Keybc8d

display station

Future

is

Jump«.

at

EC.717946 or highel!

o

*Key

Modules

Shift

Encoder 7

MOS }

""-

___

J"-P--**-S-tr-obe-(-p-in-R-)-II~

To

Connector

(May

not be present

all keyboards)

on

To

Connector

Add

wire:

•

A2B06

Remowwire:
A2B06

Add

wire:

B4B

12
Remove wire
B5B03

Add wires:
B4B

12
B5B03

KB

2

KB

1

to

to

to

to

to
to

A2008

A2008

B4oo8

(if

B5008

84008
B5008

installed):

*Each

key

module (except

inputs

active

are

generates two

**The strobe signal is

active

RESET

inputs

to

active

when two ond only twa

present

at

the

and

the

encoder.

encoder.

the shift keys)

Diagram 6-11. Type A Keyboard Encoding

Reset

(Pi

n C)

Reference Data 6-13

A

'"

~

0-

-0

~

YI

(Spare)

~

~

f--+--+

~

C

---....-

.~

~

§

.g'-

o

"

~

I

0

t

i

U

~

OJ

..

""

I

~

1

l!

.~

u

1/2

Y2

(Spare)

Boord

;:n

-0

~

I I

G H

~

t

~

I

I

I

r:::

~

Y3

(Spare)

~

(Model

t

1

u

..

..

V'

Hinge

K

I

2)-1

I

I---

.....

_~~.+_+

(Optional

See

ALD

ZZIOI

Unique

Card

Chart

Location Model

02
02
F2

F2

K2
K2
K2

K2

K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2
K2

(Languages not I isted use

__

~._~_~_~_z_

ZI

Keyboard

Feature)

to

correlate

card

I

2

I

2 All

I

I
I

I

I
I
I
I
I

2

2
2
2

2

2
2

2 Spanish
2 Portuguese

USA

'0

f--

~

I

~

I--

~

Z2

L-

_____

(_s_pa_r_e_I

____

~1

type

to

part

number.

Language

All
All
All

US

English EBCDIC

US

English ASCII-A Line Buffer

US

English ASCII-8 Line Buffer

UK

English
German
5wedish/F

i nnish
Norwegian/Danish
Spanish

Portuguese

US

English EBCDIC

US

Er>glish ASCII-A Line Buffer

US

English ASCII-B

UK

English
German
5wedish/F

i nnish

Norwegian/Danish

EBCDIC

card

types.

)

480

960 Stor

Spare -

960 Stor

Line Buffer

Line Buffer
Line Buffer
Line
Line Buffer
Line Buffer
Line Buffer
Li

Line Buffer
line
Li
Li
Line Buffer
line
Line Buffer

I--

~-+--.+-.-+-.-

IL-

_____

Name

Stor

and

Gate

and

Gate

Not

Used

and

Gate
and
and
and
and
and

Buffer

and
and
and

and

ne Buffer

and
and
and

Buffer

and

ne Buffer

and

ne Buffer

and
and

Buffer

and
and

._.-

Z3

A_~

__

'~

______

~

Char

Gen

Char

Gen
Char G en
Char

Gen
Char

Gen
Char

Gen
Char

Ger>
Char

Gen
Char

Gen
Char G en
Char

Gen
Char

Gen
Char

Gen
Char G

en
Char G en
Char

Gen

Char

Gen

Char

Gen

t Type

9057
9065

.

9065
9058
9103

9104

9102

9101
W068
W06?
W070

won

9070

9098

9099

9097
9096
W075
W076

won

W079

Diagram 6-12. Board Layout by Card Function - Without Features

6-14

(Card

Side View)

A

t=:i

"

~

r--

~

I

N

I

"0

.I::

c

-~--

"l)

8

1-

:.£

(Spare)

~

-0

~

~

-

I

e

c

--~.-

"l)

8

1-

:.£

Yl

I

--.j

.£

£

0

0

:::,.

Hinge I

(Model

N

~

!:::!-

Ii

"l)

-,:-

'E

a

U

2)--'

I

I

2/3

Boord

Y2

~

~

)

l!

~~

u

"0

-'u--

&.

(Spare)

i

--

I I

G

CD

~

....---

I

I

D

C

t

1

u

"

VI

"

H

~

Y3

(Spare)

R

~

Y4

light

II

K

t

1

u

"

~

.-

-

-

- --

Pen

iii

00

~

M

-

$

~

~

~

--.;;--

e

g

u

~

g

~

U

__

"

0>:-

<":>c

j

~

"l)

c

--6

~

t

a

"

~

~o

ON

0-';

';;"8

~~

0-

-~-

]

c U
a

u_

-c-

>-

a

a-

(5

C

l')

"

i

"l)

a

"

~

c

"

:.:::;

'i

:S

--~

-

I

"

~

_u_

~

a
c

J!.

~

:.:::;

-

I

-'

6

-,--

Hinge

(Modelll

t See

-f-o-

~

ZI Z2

~

__

'K_e_~

ALD

ZZ101

to

'ZI

- Keyboard

Z4 - Keyboard socket with

Unique Card

Location Model Language

socket

Chart

D2
D2
F2
F2
K2
K2
K2
K2
K2 1
K2
K2
l::2
K2
K2
K2
K2
K2
K2
K2
K2
K'2
K2

(Languages not I isted use

f-o-

__

rd

___

~1

correlate

card

type to part number.

without

operator

operator

1 All 480 Star

All 960 Star

2

1 All

All 960 Star

2
1

US

1

US

1

US

1

UK
German

1

Swedish/l'innish Line Buffer and Char

1

Norwegian/Danish
I Spanish
I

Portuguese

'2

US

2

US

2

US

2

UK

2

German

2 Swedish/Finnish Line Buffer

2 Norwegi
'2

Spanish

2 Portuguese Line Buffer

USA

:;;

"

:'5

-

I

co

(s_pa_r_e_)

EBCDIC

cord

'-

cord

card

types.)

-

__

~1

reader

reader

feature.

Spare

line

line
line

line
Line Buffer
Line Buffer
Line Buffer
Line Buffer
Line Buffer
Li
Li

Line Buffer and
li

feature.

ne Buffer
ne

ne Buffer

--~

--

~1

___

identification

identification

English EBCDIC
English ASCII-A Line Buffer
English ASCII-B Line Buffer

English

English
English ASCII-A

English ASCII-B
English

an/Danish

EBCDIC

Z3

~1

___

A_n_OI_O_g

Name

and

Gate

and

Gate

-

Not

Used

and

Gate

Buffer

and

Char

and

Char

and

Char
Buffer and Char
Buffer and Char

Buffer and Char

and

Char

and

Char

and

Char

and

Char

and

Char

and

Char G
Buffer

and

Char G en

and

Char

Char

and

Char G en

and

Char

Gen
Gen
Gen
Gen
Gen
Gen
Gen
Gen
Gen
Gen
Gen
Gen

Gen
Gen

Gen

-

__

en

~

~1

~1

___

Type

9057

9065

-

9065

9058
9103
9104
9102
9101
W068
W069
W070
W072

9070

9098
9099
9097
9096
W075
W076

won

W079

"l)

co

:'5

~--

I

1 !

Z4

'_K_e_~

__

ar_d

___

~

Diagram 6-13. Board Layout

by

Carel

Function - With Features (Card Side View)

Ref

...

nce

Data

6-15

1 12

2

3

4

5

6 3

N

10

o 0

••••••••••••

II

o 0

13

I,!

1

oeoeoo.

2

oeoeoo.

oeo.ooeoeoo

13

14

r

2

o.

o.o.oo.oeoo.o.oo.

o • 0 • 0

oeo.o

13

14

i

2

0.0.00.0.00.0.00.0.

0.0.0

o.o.oo.o.oo.o.oo.oe

o •
o •

13

14

r

2

o.

13

14

I

2

o 0

4

5

o 0

••••••••••••

o •

oeooeoeo

o • 0

oeoeooeo

oeoeooeo

o • 0

o • 0 • 0

oeo.

oeooeoeo

oeo

o

oeoo.oeooeoeoo.

oeooeoeooeoeo

o • 0 • 0

oeo.ooeoeo

0

.0.00.0.00.0.

o.o.ooeoeo
oeo.ooeo.o

o • 0 • 0 • 0

o.oo.o.ooeo.o

o • 0 • 0

0 • 0 0 • 0 • 0 0 • a • 0 0 •

000.000

oeoo.o.oo.oeoo.

• 0 • 0

o • 0 • 0

o.oo.oeooeo.o

0.0.00.0.0

0.0.00.0.0

o.oo.oeo

0.0.00.

o.oeoo.

••••••••••••

o 0 0 0 0 Z40 0 0 0 0 0

••••••••••••

0000000000000

M

Y4

eo.ooeoeo

o.ooeo

oeo

•

0 0

o • 0 • 0

o • 0 • 0

o • 0

oeoeoo.

oeo.oo.
o • 0 • 0

~

• 0

000

L

o • 0

o • 0

.00.0.00.0.00.0

o • 0

G2J04

0

0 0

o •

o •

o •

o •

o • 0 •

0000

0

I<

o •

o •

o •

o •

o •

o •

o 0 •

ooeoeoo

o 0 •

ooeoeoo

00.0.0

o 0 • 0 •

o 0 • 0

o 0 •

••••

G2D04

oeooeo.

eo.ooeoeooeo.

o •

• 0 •

• 0 •

• 0 • a 0

• 0 • 0

a

• 0 •

• 0 •

• 0

eo.oo.o
.o.ooeo

• 0

• 0

• 0 0

.

• 0 •

eooeo.

• 0 0 •

eooeo.

E2B03 E2G03

G

.

•

eo.

o • 0 0 •

F E

o 0 •

oeoo.oeo

oeoeooeoeooeo

o • 0 • 0

oeo.oo.
o • 0 • 0

oeoeooeo.

eoo.oeooeo.

o • 0

0.00.0

o • 0 0 •

0000

0

oeo.ooeo.

• 0 0 •

• 0 0 •

oeoeooeo

o 0 • 0

0.0.00.0.

o.o.ooeo.

o.o.oo.o.ooeo
o.oeooeoe

0.0.00.0.

0.0.00.0.

0.0.00.

o • 0 • 0

o • 0 •

••••••••••••

•••••••••••

o.

•

o • 0 •

• 0 •

o • 0

o • 0

o •

oeoo.oeooeoeoo.

oeooeoeooeoeooecteooeoe

0.00.0.00.0.00.0.00.0.

0.00.0.00.0.00.0.00.0.

0.00.0.00.0.00.0.00

o.ooeo.oo.

eoeoo.

oeooeoeoo.

o.ooeo.oo.

oeoo.oeo

oeooeo.

0000000
00000000

0.00.0.00.0.00.0.00.0.

9.00.0.00.0.00.0.00.0.00eo.o

o.oeoo.o.ooeo.o

o • 0 • 0

00.0.00.0.00.

00.0.0

oo.oeoo.o.ooeo

00.0.00.0.00.0.00.

o •

o 0 •

••••••••••••

o 0 a 0 0 0 Z2 0 0 a a Z I 0 0 0 0 0 0

o

••••••••••••

0.0.00.0.00.0.00.0.00.0.0

o • 0

o • 0 • 0 o • 0

o • 0 • 0

0.00.0.00.

0.00.0

ooeo.o

00.0.0

0.00.0.0080.00.0

a • 0 0 • 0 • 0 0 • 0 • 0 0 • 0 • a 0 •
o.ooeoeo
o.oo.oeooeoeo

000000

eoo.o.o

.oo.oeo

o.

0.0.00.0.00.

o •

oeo.oo.o.o

oe

o •

o •

•

oeoo.o.o

o •

o.

a 0 • a
ooeo.o

o • 0

o 0 • a

• 0

• 0

• 0

• 0

0.0.0

• 0 • 0

o • 0 • 0

o • 0

A

...

·---c:..IIc......

2

• 0

13

14

-I
2

• 0

3

• 0

• 0

13

14

-I

2

• 0

4

13

14

-I

2

5

13

14

-I

0

2

3 6

0

4

5

A1D13

P.-

.....

o 8

· .

_

.....

J G

· .

_PinI

P M

· .

_PiN

U S

· .

Notes:

I.

+5V

IS

found

2.

DC

return (ground) is found on

3.

+8VisfoundonpinE2011.

4.

·12V

is

5.

6. Two high Clrd

7.

8.

Di

found

+J.4VisfoundonpinM2011.

2/3

board

(felture

112

board (no features 1

I.

Card columns

b.

Sock.ts
c. +5V bus runs
d. Ground bus runs

......

m 6-14.

6-16

Return +5V

Bus

(W21

Model 2

on

all

003.

J03.

on

pins

02006.

in

E2

and

four high

boardl used for illustrltion.

is

the _ except:

L.

M,

and

Ind

be_n

Board

Z4

.r.

not

card columns H

be_

N are

Layout

\,,4

Bus (Wl1

only

POJ.

InC! U03 pins.

III

008.

JOB.

F2006.

E4006.

c.d

in G2 used for illustratIon.

not

pre.."t.

~nt.

.nd

card columns J and

P08 InC! U08 pins.

M2D06. and K2D06.

J.

K.

G2P09

Pin Identific8tion D8ta (Pin Side View,

G2S13

Gate

A

A1

C8E04

c.dColumn

I

Card Row

M 2 B

Return +5V

Bus

Socke.

LOUiuon

Pon

Column

""Row

I

09

(W21

Bus

Model 1 only

1:::::-

(WlI

Section 7. Component Locations

Photographs and drawings are provided
aid

in

locating field-replaceable units, adjustable com-

in

this section

to

ponents, and voltage measurement points.

Diagrams

7-1

through 7-6 show Model 1 and Model 2

component locations. Type A keyboard locations are

shown

locations and

in

Diagrams 7-7 and 7-8. Voltage component

test

points are shown

in

Diagrams 7-9 through
7 -15. Diagram 7-16 shows component locations on both the
old and new analog 'cards. Type B keyboard locations are
shown in Diagrams 7-17 through 7-19.

*OFF-PUSH

(Power)

Switch
(Brightness ­(Contrast -

Outer Knob)

Inner Knob)

Indicators (3)

*Line

Fuse

(F1)

Jack

(Feature)

Line Cord
Retaining

Diagram 7-1.

Modell

Slot

Locations, Front View

Reader Jack

Jack

Signal Cable
Retaining

Slot

Volume
Control

*Field Replaceable Unit

Com

......

Locations 7·1

Cone
Shield

Centering
Magnets (2)

(Under Shields)

Yoke Shield
(*Yoke

under

Shield)

*CRT

CRT

Anode

*Prime

Power
Box

* -12V Regulator

(Behind Low­Voltage

PC

Board)

*Ferro

Focus

Potentiometer

Diagram 7-2. Model 1 Locations, Left-Side View

*High-Voltage

Power

Supply

INTEN

CRTPb

~==Slj~

Analog Card
Adjustments (4)

*Field

Replaceable

Units

7-2

*+5V

Decoupling
Capacitor

*CRT

Yoke

Shield

Cone
Shield

Diagram 7-3. Model 1 Locations. Rear View

*-12V

Regulator

* Arc-

Su

Board

ppression

*Field

Replaceable

Component Locations

Units

7-3

+5V

Fuse

AI

(Fl)

+34V

Fuse

AI

(F2)

TB1

Diagram 7-3.1. Location

74

of

+5V and

+34V

Fuses (Model 1)