IBM 3279 2A, 3279 3B, 3279 2B, 3279 3A Maintenance Information

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Maintenance

Library

=-=-=-=-

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Color
Models 2A, 28, 3A,

Maintenance

Display

Station

and

Infonnation

38

SY33-0069-3

(Part

1)

Maintenance

Library

=~ff-;:

~

Color Display

Models
Maintenance

2A,

Station

28,

3A, and

Information

38

SY33-0069-3

(Part

1)

3279

MIM

Preface

Part

This publication contains the information needed
service

and

Station Models 2A, 2B, 3A,

Part 1 comprises the Maintenance Information

Parts Catalog.

maintain the IBM

and

3279

Color Display

3B.

to

and

Fourth Edition, November 1981

This is a major revision of,
and

specifications contained herein shall

part without written permission.
IBM has prepared this maintenance manual for the use of IBM customer

engineers in the installation. maintenance, or repair
machines indicated.
any

other

purpose.

Information contained in this manual
time.

Any

Technical Newsletters.

It

abollt, IBM products (machines or programs), programming,
that
must
products, programming,

Publications are not stocked
IBM publications should be made
IBM

A form for reader's comments
if the form has been removed, comments may be addressed

• International Business Machines Corporation, Department

or

IBM
believes appropriate without incurring

e Copyright International Business Machines Corporation 1979, 1980,
1981

sllch change will be reported in subsequent revisions

is possible

that

are

not

announced in your country. Such references

not

be construed

branch

office serving your locality.

1133 Westchester Avenue, White Plains,

IBM United Kingdom Laboratories Limited,
Point 95, Hursley Park, Winchester, Hampshire

may use or distribute whatever information you supply

and

obsoletes, SY33-0069-2.

not

he reproduced

to

to

at

the back

New

York 10604.

Product

obligation

of

that

change from time

announce such IBM

S021

to

IBM makes no representations

is

subject

this material may contain references to,

to

mean

that

or

IBM intends

services in your country.

at

the addresses given below; requests for

to

your IBM representative

is

provided

any

2 comprises the Maintenance Analysis

Procedures.

If

this machine

extra

RPQ

under

the keyboard.

The

drawings

in

whole

or

the specific

it is suitable for

to

or

or

information

or

services

or

information

or

to

the

of

this publication;

to

either:

812H,

Publications, Mail

2JN, England.

in

any

you.

way

is

fitted with

documentation

in

it

can

any

he

RPQ

found

features,

in a tray

ii

any

Contents

Chapter

1.

1.1 Introduction

1.2 Display Unit 1-2

1.3 Keyboards 1-9

1.4 Tools and Test Equipment 1-9

Chapter 2. Maintenance Aids 2-1

2.1 Maintenance

2.2 General Failure Index 2-1

2.3

2.4 Intensity Override 2-1

2.S Test Modes (Offline) 2-1

2.S.\

2.S.2 Test Mode 2: Keyboard 2-3

2.S.3 Test Mode 3: Commands 2-4

2.6 Online Tests (Control

2.6.1 Running Online Tests 2-6

2.6.2 Test

2.6.3 Test

2.6.4 Test 3:

2.6.S Test 4: Error Log Reset

2.6.6 Test 7: Operator Convergence Utility

2.6.7 Test 8: 7-Color and

2.6.8 Error Codes

2.7 Jumper Positions 2-13

Chapter 3. Functional Components

3.1 Power Supply 3-2

3.2 Analog Card 3-2

3.3 Amplifier Card

3.3.1 Convergence Circuits 3-4

3.3.2 Color Controls

3.4

General Description and Locations

1.1. 1 Controls 1-1

1. 1.

2 Indicators 1-2

1.2.1 Electrical Grounding 1-2

1.2.2 Equipment Lightning

1.2.3 Video

Scan Codes 1-9

1.3.1

1.3.2 Break Codes 1-9

1.3.3 Keyboard Cable 1-9
System Upshift 1-9

1.3.4

1.3.5 Keyboard Type Identification 1-9

1.3.6 Keyboard Lock 1-9

1.3.7 Numeric Lock (Feature) 1-9

1.4.1 General Logic Probe

MAPs 2-1

Test Mode

Station)

Symbols (PS) 2-10

Video Card 3-6

1-1

1:

and

Pattern

2-\\

Inputs

Protection 1-2

Unit to Display

Programmed

3-6

01)tput Facility 1-2

Plan 2-1

2-S

0

2-6

1:

Error Log 2-9
Status Summary

1-10

2-\

3-4

2-\0

2-\0

3-1

3.S

Cathode

1-1

3.6 Convergence Logic

3.7 Line Control Card (Location

3.8 Base Logic Card (Location

3.9

3.10

3.11 Selector Light

3.12

Chapter 4. Removal and Replacement

4.1 General 4-1

4.2 Logic

4.3 Rear Cover 4-1

4.4 Bezel 4-1

4.4.1

4.4.2 Brightness and Audible Alarm

4.4.3

4A.4

4A.S Security Keylock 4-3

4.S Power Units 4-3

4.S.1 Fuse 4-3

4.S.2 Power Supply 4-3

4.S.3 Prime Power Box 4-3

4.S.4 Analog Card 4-4

4.6 Logic Cards

4.6. I Removal

4.6.2 Replacement 4-4

4.7 Connectors 4-5

2-10

4.7.\

4.7.2 Internal Coaxial Connection 4-S

4.8 Video Components 4-7

4.8.\

4.8.2 Video Card 4-7

4.8.3

4.8.4

4.8.S Degauss Coil 4-10

4.9 Logic. Board

4.9.1 Removal

4.9.2 Replacement

4.10

Ray Tube and Coil Assembly

APL/Extended

(Location E2) 3-11

Programmed Symbols (PS) Card (Feature)

(Location

(Location

Magnetic Reader Control (MRC) Card

(Feature) (Location

Procedures 4-1

Gate

ON/OFF

Volume Controls 4-2

Normal/Test,

Oualcase/Monocase Switches 4-2

Indicator LEOs 4-3

Multi-Pin Connections 4-S

Amplifier Card 4-7

CRT

and Coil Assembly 4-7

EHT

Bleed Assembly 4-9

Audible Alarm 4-1 \

Card

(Location B2)

C2)

Character Set (ECS) Card

F2)

Pen (LP) Card (Feature)

G4)

4-\

Switch 4-2

4-4

4-4

Planar Strips 4-10

4-10

02)

3-12

3-13

G2)

3-13

Base Color. and

4-\0

3-9

3-9

3-6

3-8

3279 MIM

iii

3279 MIM

6.

4.1 I Keyboard Units 4-11

4.11.1 Keyboard From Display

4.11.2 Keyboard Top Cover 4-11

4.11.3 Keyboard Assembly From Base 4-11

4.11.4 Clicker Assembly 4-11

4.11.5 Keybutton 4-11

4.11.6 Key Modules 4-12

4.11.7

Spacebar 4-13

4.11.8 Logic Card Assembly 4-13

Chapter 5. Display Adjustments 5-1

5.1

Initial Checks 5-2

5.2 Coarse Adjustments 5-2

5.2.1 Coarse Color Balance 5-3

5.2.2 Coarse Raster Adjustment 5-3

5.2.3 Coarse Focus 5-3

5.2.4 Coarse

5.2.5 Coarse Color

5.3 Fine Adjustments 5-4

5.3.1

5.3.2 Purity 5-4

5.3.3 Dynamic Convergence (Online Test

5.3.4 Focus Adjustments 5-5 Abbreviations G-I

5.3.5 Raster Controls 5-6

5.3.6 Red Brightness 5-7

5.3.7 Color Balance 5-7

5.3.8 Repetition 5-8

5.3.9 Convergence Amplifier Gain Controls 5-8

Static Convergence 5-3

Purity 5-4

Static Convergence 5-4 Information Area

Station 4-11

7)

Chapter

6.

1 Block Diagram 6-1

6.2 3279 Control

6.2.1 Waveforms 6-2

6.2.2 Activation

6.3 Top Card Connector and Planar

6.4 Grounding and Cables 6-18

6.5

6.6 Bezel Wiring 6-26

6.7 Keyboard Jumpers and Cables 6-28

6.8 Attachment Cabling

6.9 ECS and

6.10 Power Supplies 6-33

6.11 Display Attributes and Modified

6.12 Extended Character

Appendix

5-5

Abbreviations and Glossary

Glossary G-3

Parts Catalog

Index

Support Information 6-1

Strip Wiring 6-5

CRT

Drive Circuits 6-25

Data Tags 6-34

A.

Indicators In Operator

X-I

Signals 6-2

Sequence 6-5

PS

6-30

Card Layouts 6-32

Set Buffer 6-35

G-I

iY'

A-I

Figure

1-l.

Figure 1-2.

Figure 1-3.

1-4.

Figure

Figure 1-5.

Figure 1-6.

Figure

2-l.

Figure 2-2.

Figure 2-3.

Figure 2-4.
Figure 2-5.
Figure 2-6.
Figure 2-7.
Figure 2-8.

Figure 2-9.

Figure 3-1.
Figure 3-2.

Figure 3-3.

Figure 3-4.
Figure 3-5.
Figure 3-6.

Figure 3-7.
Figure 3-8.
Figure 4-1.
Figure 4-2.
Figure 4-3.

2-10

IBM

IBM

(02)

3274

3276

and

3-10

I-I

Uoe

(F2)

1-5

3-12

Controls and Indicators

Display Unit - Front View with

Bezel Removed 1-4
Display Unit - Rear View
Display Unit - Rear View, Open 1-6
Display Unit - Interior View 1-7
Logic Card and Top Card Connector

Locations (card side) 1-8
Illtensity Override (Test Mode) 2-2

Test Mode 1 Pattern 2-3

Keyboard Character Interpretation

for Test Mode 2 2-3

Online Test
Test 1 Pattern 2-9
Test 3 Pattern
Test 8 Pattern 2-11

Error Codes From

Control Unit 2-12

Error Codes From

Control Unit 2-13

3279 Block Diagram 3-1
Power Supplies to Logic Gate

and Analog Card 3-3

Synchronization, Convergence, Purity.

and Deflection Coil Connections 3-5
Shadow Mask 3-7
Convergence Logic Card (B2) 3-8
Base Logic Card

Control Card
APL/ECS
Programmed
General View - Bezel Removed 4-1
ON/OFF
Brightness and Audible Alarm Volume

Control Assembly 4-2

0 Pattern 2-7

(C2)

'Card (E2) 3-11

Symbols Card

Switch 4-2

Figure 4-4.
Figure 4-5.
Figure 4-6.

Figure 4-7.
Figure 4-8.

Figure 4-9.

4-10.

Figure
Figure 5-1.
Figure 5-2.
Figure 5-3.
Figure 6-1.
Figure 6-2.
Figure 6-3.
Figure 6-4.
Figure 6-5.
Figure 6-6.
Figure 6-7.
Figure 6-8.
Figure 6-9.
Figure

6-10.
Figure 6-I
Figure 6-12.
Figure 6-13.
Figure 6-14.
Figure 6-15.
Figure 6-16.
Figure 6-17.
Figure 6-18.
Figure 6-19.

A-I.

Figure

Switches 4-2
Indicator LED Assembly 4-3
Logic Card Removal and

Replacement 4-5
Analog Card 4-6
Convergence/Purity Coil

Assembly 4-9

Strip Holders 4-10

Planar

Audible Alarm Assembly 4-11
Adjustment Procedure
Voltage Table 5-2
CRT Alignment Mask 5-6
3279 Block Diagram 6-1
Waveforms (3 Parts) 6-2
Top Card Connectors (4 Parts) 6-5
Planar

Strips ­Grounding Diagram 6-18
Cabling Diagram 6-19
CRT Drive Circuits 6-25
Bezel Wiring 6-26
Video Card Test Points 6-27

Amplifier Card Test Points 6-27

1.

Keyboard Logic and Connector 6-28
Logic Gate to Keyboard Cable 6-29
Attachment Cabling (2 Parts)

and

PS

ECS
Mainline

Supplies to Amplifier Card 6-33

Base Field Attribute Byte 6-34
Attribute Characters 6-35
ECS Byte 6-36

Layout of Operator Information

Area

Card Layouts 6-32

Supply 6-33

A-I

BD

5-1

(4

Parts) 6-11

6-30

3279 MIM

v

3279 MIM

Safety

If
with
practice these
with

You
respect

You should take every
possible
pactices

1.

2. Remove all

3.

4. Unplug the

5.

Guidelines

you are aware

electrical and mechanical equipment and

this

need.

You should

conditions or around equipment with

dangerous voltage.
manager

assembling
the immediate area
performing
supplies,

Circuitry.

Power
generators, and other units
Which exceed 30 V ac

be serviced

removed

within the machine, unless maintenance

documentation clearly states otherwise.

(This

grounding is maintained.)

possible
The

be locked in the

a DO NOT OPERATE tag

Be

aware
IBM machine may be
source and be controlled
disconnect

When

equipment having exposed live electrical
circuitry, observe the
a.

Another

controls

(Someone

power

of

the guidelines

guidelines, you can

equipment.

not

fear

it.

and observe the

while

is

wall

it

electricity,

safety

'maintaining IBM equipment:

not

if

this is a potential problem.

power
major

mechanical inspection

or

installing changes

supplies, pumps, blowers,

with

from

done

power

before

box

that a non-IBM

or

is

absolutely necessary

person familiar
must

if it

following

work

alone under hazardous

Always

before removing

components,

of

power

or

power

on when the

its

normal installed position

to

ensure

that

supply

working

switch

circuit breaker.

must

should become necessary.)

on the machine.

when

off

position

(form

powered

by a different

following

be in immediate vicinity.

be there

but

precaution

advise

supplies,

with

42.4 V

proper

cord

turned

or

attachment

with

to

for

working

work

safely

you

must

safety

your

or

working

of

power

in

machine

motor

voltages

dc

must

unit

whenever

off

should

tagged

with

Z229-0237).

to

from

another

to

work

precautions:

power

off

turn

off

vi

b. Do

not

wear

any

jewelry,

frame

eyeglasses,

of

the event
current
contact

c. Use

and appropriate probe
(Remember,
unsafe.)

d. Use only one hand

energized equipment. Keep the
hand in

(Remember there
circuit
procedure helps eliminate a path

in

not
is

an

on

could complete a circuit through you!)

e.

When
that
insulated
used.

f.

Avoid
floor
suitable
necessary.

6.

Follow
working
These instructions are outlined in CEMs and
the

safety
documentation. Use extreme care
checking high voltage.

7.

Avoid
have

not

tools

hand
should be inspected periodically.)

8. Replace
equipment.

-After maintenance, restore all

9.
such as guards, shields, signs, and
leads. Replace
worn

or

are

there

Don't

defeat

them

at

contact, there

flowing

because

area

afforded

only

insulated pliers, screwdrivers,

worn

your

pocket

for

electrical shock. This

using

test

controls are

probes

contacting

strips, machine frames, etc.). use

rubber

mats

special

safety

with

extremely high voltages.

portion

of

use

of

tools

[wire

wrap

or

broken

any

protect

their

purpose

completion

and

been apPllf)ved

worn

.defective. (These

to

the

chains, metallic

or

metal

cuff

links. (In

will

be

of

by

tips/

or

cracked insulation

when

or

behind

must

be a complete

equipment, be certain
set

correctly and

of

proper

ground

purchased locally

instructions

maintenance

test

equipment

by

IBM. (Electrical

guns, drills, etc.]

tools

safety

device

safety

you

from

by

of

the

more

the greater

the metaL)

extenders.

working

on

other

your

that

that

capacity are

potential (metal

when

when

and

test

safety

devices,

ground

that

is

devices
a hazard.
not

replacing

service call.)

is

back.

if

that

10.

Safety

glasses

must

be

worn

Using

a hammer

Power

hand drilling.

•

Using spring hooks, attaching springs.
Soldering,

bands.
Parts

cleaning, using solvents, chemicals,

to

wire

cutting, removing steel

when:

drive pins, etc.

and cleaners.
All

other

conditions

hazardous

11.

Never

assume

(Check

it

first.)

Always

12.
your

nongrounded extension cords,
missing safety

13. Do

surface
surface
and can
personal injury.

14. Four

event
a.

be alert

working

not

touch live electrical circuits

of

the plastic dental mirrors. The

of

the dental

result in machine damage and

steps

that

of

an

electrical accident:

USE CAUTION - DON'T

YOURSELF.
b. TURN POWER
c. HAVE SOMEONE

HELP.
d.

ADMINISTER RESCUE BREATHING

VICTIM

IS

15. Do

not

use solvents, cleaners,

have

not

been approved

16.

Lift

by

standing

stronger

leg muscles. This takes strain
back muscles. Do
parts

which

you

17. Each

18. Place removed machine covers in a safe

customer
be certain
renders the
hazards

out-of-the-way
machine. These covers
the machine
to

that

product

to

customer

the customer.

before

which

to

your

eyes.

that

a circuit is deenergized.

to

potential hazards in

environment (i.e.,

grounds,

etc.).

mirror

is conductive

should be taken in the

BE

OFF.

ELSE

GET

NOT BREATHING.

by

IBM.

or

pushing up

not

lift

engineer

action on

unsafe

personnel.

while

the machine

any

is

responsible

his/her

or

must

feel uncomfortable

no

location

might be

damp

floors,

power

surges,

with

A VICTIM

MEDICAL

IF

or

oils

that

with

off

equipment

with.

part

exposes

servicing the

be in place on

is

returned

3279 MIM

to

the

or

19.

Always

place

CE

tool

kit

away

areas

where

no

under

desk

20.

Avoid
caught in machinery.
left

buttoned

Long hair and scarves

21. Ties
clasp (preferably non-conductive)
approximately three inches
when

servicing a machine.

22. Before starting equipment, make sure
fellow
in a hazardous position.

23. Maintain
the machines
completing maintenance.

24.

Avoid

when

lubricating, checking

Prevention
should

always

and practice

Making certain
receptacle meets IBM equipment
requirements.

Inspect line
loose, damaged

Before removing a

retain a charge from the machine, review the

procedure in the maintenance documentation.
CAREFULLY discharge the necessary
components
service procedure.

not

Do
trouble

Never

assume

circuit.

No
time. The exact condition
unknown.

The

power

wired.
Safety

or

defective.

The maintenance and /
may

be uncertain

one can

or

table).

wearing

loose

clothing

Shirt sleeves

or

rolled

up
must

must

be tucked in

CEs

and

customer

good

housekeeping in the area

while

performing and

touching

moving

is the key

good

to

be conscious

cords

electrical safety. You

habits

such as:

that

the customer's

and plugs. Check

or

worn
component

exactly as directed

use

an

ordinary

light.

anything

machine

Here are some

receptacle could be incorrectly

devices

about

is

completely safe a/l

or

features could be missing

or

or

unclear.

from

trip

ovor

it

(i.e.,

that

may be

must

above the

be

secured.

shirt

or

have a

from

the end

personnel are

after

mechanical parts

for

play, etc.

of

electrical safety

power

Pl,lrts.

for

which

by

the

lamp as

an

extension

a machine

of

a machine may be

of

the reasons

modification

elbow.

can

walk

be

tie

that
not

or
of

the

why:

history

of

vii

3279 MIM

A

possible

The

machine

transportation
The machine

or

attachment.

An

EC

improperly

The machine

age

or

design

may

damage.

might

or

sales change

installed.

may

environmental

deficiency

have

suffered

have an

may

have

deteriorated

extr8mes.

could

exist.

unsafe

alteration

have been

due

viii

A

component

hazard.

Some
been

Relating

the

condition

to

Before
exercise

caution.

component

incorrectly

to

safety,

of

the

you

begin a service

good

jud!!ment

could

be

of

assembled.

these

machine can

defective,

the

machine

are

and

some

call

proceed

creating

may

of

the

be

affected.

or

procedure,

a

have

ways

with

Electrical

Administering

In

implementing

electrical accident

Use
with
necessary
Power
the
disconnect
dry
pull
with

Act

hel she

possibly
heart

Call
Emergency,

someone

Determine

Make

1.
and
mouth
airway
the
and place one hand beneath the
neck
Then
head
forehead
Figure 1.

Accidents

First

rescue

Caution

the electrical

electrical current.

stick

or

the

Quickly

is

Fire

that

tongue.

and the
lift
backward

one

If

the

so~rce,

to

use the

Off)

or

disconnect

switch

cannot

or

another

push

the

victim

electrical

equipment.

If

the

may

need rescue breathing and

external

cardiac

not

beating.

Rescue

(Rescue Squad,

Ambulance,

summon

medical aid.

if

the

victim

certain

that

the

it

is

not

objects

the

from

obstructed.

that

gum,

Position

other

neck

with

with

the

other

for

such as

Aid

procedures

must

victim

room

If

nonconducting

away

victim

needs rescue breathing.

victim's

food,
the

hand

pressure

is

still in

it

may

EPO

switch

the

EPO

be located,

from

is

unconscious,

compression

Hospital

airway
Check

may

be

blocking

dentures

victim

on

his

one

hand and

on

hand as

in an

contact

be

(Emergency

to

remove

or

use

object

contact

if

the

etc.) Have

is

open

the

the

or

even

on

his

back

victim's

forehead.

tilt
the
shown

in

a

the

2.

Now

you

must

look,

listen,

and

feel
determine
Place
and
of

to

Figure

At

the

upper
If

the
should:
a.

With
shown
pressure
your
so
nostrils
index

CAUTION

Use

reSCue
have
NOT
THE

your

nose

air,

1

same

abdomen

victim

the

in Figure

hand

that

you

together

finger

extreme

breathin!!
breathed
INHALE

VICTIM,

if

the

cheek

to

listen

time,

to

is

not

head

in a backward

on

the

while

can

(Figure 2),

care

AIR

victim

close

and feel

look

at

see

if

breathing

1,

continue

victim's

rotating

pinch

with

when

to a victim

in

toxic

EXHAUSTED

is

breathing

to

the

for

the

chest

they

rise and fall,

properly,

forehead

this

the

victim's

the

thumb

administering

fumes,

freely,

victim's

the

exhaling

and

you

tilt

as

to

exert

with

same hand

and

that

may

DO

BY

to

mouth

Figure

b. Open

your
breath. Make a
mouth
blow

into the

2

mouth

around the

victim's

wide

tight

victim's

seal

mouth

and take a deep

with

your

mouth

and

(Figure 3).

Figure

4

Figure

3

c.

Remove

your

to

exhale

chest

while

to

fall (Figure

mouth

watching

4).

Cathode Ray Tube

The primary hazard
result·

of

an implosion. The

deal

with

phases are equally
any area could result in
employee

Any
information
unit's

Storage

1.

different

or

additional

CEM/Service

Cathode Ray
received,
from

area
carton,
one

of

sealed

to

of

CRTs

phases
important

customer.

will

of

Cathode Ray Tubes

transported,

to

they

equivalent strength, and securely

prevent accidental opening.

possible

information

be included under

Aids.

Tubes

must

area.

If

must

be in the original carton

and

allow

the

for

the

Safety

is

flying

following

of

CRT SAFETY,

and negligence in

injury

or

variation

that

be enclosed

or

otherwise

they

are shipped in a

victim

victim's

glass

sections

to

an

from

specific

when

moved

Also,

as a

All

this

d. Repeat this cycle once every five

seconds until the victim breathes
himself

or

medical help arrives.

Reporting Accidents

It is

aCE's

accidents, potential electrical hazards, and

miss"

Remember, a linear miss!! accident might be the

result

reporting
resolved quickly.

It's
since the conditions
be varied

2. CRTs should be stacked as per directions on

3.

or

responsibility

accidents

of

a design deficiency and

will

ensure

important

original
and/
carton
protection.
or
be able

should

manufacturer's carton.
with
Cartons should
two

CRT storage areas
flow
pedestrian
be
moisture

to

slightly

or

equivalent packing materials

or

forms

to

give the

piece

of

equipment, the equipment

to

contain the glass fragments

an

implosion occur.

faceplate (viewing surface)

high.

of

material handling equipment and

traffic.

dry

to

insure

and collapse.

to

to

your

field

that

the situation

report

even a

which

to

If

caused

cause serious injury.

must

be placed inside the

tube

proper

tubes

are transported in a unit

When

not

be stacked more than

will

be away

Also, storage areas

that

cartons

for

report all electrical

manager.

minor

prompt

shock

it

need

support

in

doubt,

down.

from

will

not

will

"near

be

only

and

must

stack

normal

must

absorb

3279 MIM

ix

3279

MIM

Maintenance and Installation

1.

No one shall be permitted

maintain, replace, or handle high-vacuum

tubes

until

he

has reviewed this CEM.

2. Cathode Ray Tubes
transported,
to

area should be

their original shipping carton and sealed.

3.

When
safety
safety

a.
b. Long-Sleeved Garment.

4.

Tubes
remain
under

5.

Avoid
tube
possibly

6. Prior
discharge all stored potential which
exist
socket
high-voltage

Ray Tubes
both
capacitor.
capacitive
original
discharge
immediately

7. Do

neck alone. The neck is the

the

handle
shipped
be used
placement

container.

or

otherwise

handling CRTs, personnel

equipment at all times. The required
equipment is:

Safety

Glasses - IBM Part 5715010

und<;>r

vacuum

out

of

their

test

or

inspection.

scratching

because

this

cause

it

to

removal

of

on the

tube's

pins and the capacitor

supply. (NOTE: Some Cathode

contain a conductive

the

inside

and

Within

charge

discharge.

each

tube a second

before

not

handle Cathode Ray Tubes

tube

and

is

easily broken.

tubes

with

with a lifting

for

the removal

of a tube

to

install, adjust,

when

received,

moved

completely

carton unless

or

bumping any

may

to

any high-vacuum tube,

anode button

outside

some

builds

It

removal.)

two

enclosed in

will

not

be permitted

weaken

implode.

surfaces

tubes, a

up

following

is

therefore

time

weakest

hands.

strap, this strap should

of a tube

into,

the shipping

from

area

will

wear

they

are

part

of

the glass and

may

or

base

in

the

coating

on

to

form

second

the

important

by

the

part

Always

If

the CRT is

from,

the

and

x

8.

When

inserting

or
equipment,
large end
or

out

of

present, can be used in this process.

9.

Avoid

placing the

when

there

rolling.

If

anywhere except in its special carton, a

of

felt

piece
placed under
glass. Place larger tubes vertically on
faces, and

to

a

to

of

possibility

10.

When

removing a
should be enclosed in
as soon as
of

breaking. Cathode Ray Tubes should be
placed in the carton
up

and the neck

weight

of

neck. The container should be sealed

with

securely

tipping,

turned

positioned

Disanning Cathode Ray Tubes

Field personnel should
Tubes. Tubes

in

accordance with existing Environmental

Protection

return.

Disposal

An

Inventory/Distribution

to

the Branch

disposal

of

July

14, 1980

removing tubes

they

must

while

position. The

is

it

is necessary

not

of

possible

the

face

Agency

of

CRTs.

be supported

carefully guiding

lifting

tubes

any

or

it

rolling.

tube

strong

will

on a table

possibility

to

other

soft

to

prevent scratching the

on their sides,

tube

its

to

reduce the chances

with

down.

Be

is

not

tape

over

so the tube is

down.

not

be disarmed and

requirements at the plant

Cathode Ray Tubes

Office

with

from

by

the

the

neck in

strap,

if

or

bench

of

the

tube

place a

tube

material should be

their

to

prevent the

from

equipment,

shipping container

the large face end

sure

that

resting on the

and,

disarm Cathode Ray

letter

instructions on the

the

to

prevent

disposed

has been issued

it

of

of

hand

Chapter

1.

General

Description

and

Locations

1.1 Introduction

The

IBM

3279

by

a coaxial cable

or the IBM

an

Integrated Display Printer
processor.
color display

Four
3B. Model 2 has
Model 3 has
additional model

system-control console. see

Color Display Console Maintenance Information

SY33-0090. Models with an A-suffix
four colors. Models with a B-suffix have

highlighting and 7-color capability

additional font for
Control
B-suffix,
model2A.

Optional features include a selector light pen, a
security keylock, and magnetic reader control (for

Indicator

(Power Onl 0 Switch

Indicator
(Display Ready)

Indicator 3 I

ITestl

Color Display Sfation

to

the IBM :1274 Control Unit,

3276

Control

Unit/Display

The

3279

Display Station consists of a

unit

and an alphanumeric keyboard.

models of 3279 are available; 2A, 2B,

24

lines,

32

lines, each of 80 characters.

3279-2C

and

APL/Text.

not

support models with a

that

the

IDPA

Unit does

each

is available as a

'~i

2.~

is

connected

Station, or

Adapter

(IDPA)

3A

characters;

An

Model

display

and

an

the

3276

2C

and

..

of

80

IBM

3279

can

(ECS)

Note

that

supports only the

r-"(-=============-::,

••

slot reader or
(PS2-two fonts, and PS4-four additional fonts)
an

optional feature

Machines are available
of

either

100

240 V (50

storage to retain convergence data when switched

off.

1.1.1

COli

1.1.1.1 Power

This switch controls line voltage. Wait
approximately
switching on again. This allows any stored fault

conditions

1.1.1.2

NormallTest

This switch when' operated takes the machine

and

offline

scanner). Programmed symbols

on

model 3B.
to

127 V

Hz).

operate

(SO

or

A battery

to

or

60

trois

On/Off

Switch

10 seconds after switching off before

to

reset.

Switch

into Test Mode.

iNormal/Test

Q

ea

~

I Switch IAaAI

from an ac supply

60

Hz)

or

200

is

used

to

Base

Color

Switch (oooo/col

Dualcase/Monocase

is

to

enable

:::~:::/~~:----~

Switch

Operator ,
Information

Voltage Rating

Plate

Mainline Fuse

Figure 1-1. Controls

3279

-------!-....

Area

-------

-----------

MIM

I--~-,

-++-----'"

___

\

~~L._______

'--

."

~

.-/

'-"----r-7---::=====;:-=---------r:::--

V,

-r@A)h_securitYKeYIOCk

1...

____

~_:;;.?-:..---------..JJ-

and

Indicators

Chapter

I.

~~~~~~:

.J.---arightness

• ) and Intensity Override

General Description

~~~:Ol

Control

Switch

and

Location

1-1

3279

MLM

1.1.1.3

Base Color Switch

is

in the

'00'

When this switch
colors blue and red are replaced by green and white

respectively. The separator line and the operator

information area remain blue. Green and white

fields are not affected, nor arc any fields controlled,

ECS.

by

1.1.1.4

Dualcase/Monocase Switch

When this switch

alphabetic characters are displayed

1.1.1.5 Intensity Override Switch

This switch operates when the brightness control

turned fully counterclockwise. It sets the brightness

circuits to maximum and the screen shows

rasters

of

details.

1.1.1.6

This control sets the volume of the alarm.

1.1.1. 7 Brightness Control

This control sets the brightness of the display.

1.1.1.8

When in operation, this feature blanks the data area

of

the screen

machine.

1.1.2

1.1.2.1 Indicator I (Power On)

This indicates line supply and
available.
other voltages generated within the machine.

1.1.2.2 Indicator 2 (Display Ready)

This indicator lights when the display

thus confirming that most

operational. This condition occurs about 45 seconds
after both deflection circuits are activated. The
delay allows the CRT cathode time to warm up.

1.1.2.3 Indicator 3 (Test)

Indicator 3 Lights when Test Mode

1.1.2.4 Operator Information Area

The Operator Information Area is the row below
the separator line, and displays characters that
indicate the status of the 3279.

is

in the

red, blue, and green. See section 2.4 for

Audible Alarm Volume Control

Security Keylock

to

prevent unauthorized access to the

Indicators

It

does not confirm the availability of

position, the base

'A'

position, all

in

uppercase.

+5

V supply

is

is

selected.

unblanked,

of

the analog circuits are

is

fuU

Chapter

1.

General Description and Location

1.2 Display Unit

The display unit comprises a main enclosure

assembly, a logic gate, and a
Figure 1-5. Field Repl""eable Units (FRUs) are

in

the Parts Catalog.

listed
The weight of the unit

(58 lb) without keyboard.

1.2.1

Electrical Grounding

The ac ground and de returns are electrically
connected in the 3279 display unit. The coaxial
cable return (shield)
at

the 3279.

With the ac power cord disconnected, a
correctly-wired unit should indicate continuity
between ac and de ground, and an open circuit
between ground and the shield of the device coaxial

b~zel

as shown

is

approximately 27

is

isolated from the dc return

in

Kg

cable.
See Figure 6-5 for a complete grounding diagram.

1.2.2

Equipment Lightning Protection

The 3279
energy path from the external coaxial cable shield
to frame (ac) ground for potentials above 36

Additional information on lightning protection
requirements for the customer coaxial cable

This allows suitable monitors to display the contents
of
and Operator Information Area).

Red Video, Green Video. Blue Video and
signals are fed to individual coaxial sockets

customer access area.

is

designed to provide a low-impedance

V.

is

(customer responsibility)

Information Display Station Installation Manual ­Physical Planning. GA27-2787.

1.2.3

Video Output Facility

provided in

IBM

3270

the 3279 screen (except for the separator line

Sync

in

the

A sync polarity indicator and two switches (video
control switch and sync polarity switch) are

provided in the customer access area.

also-

1-2

1.2.3.1 Video Control Stritch
This switch has three positions:

1.

Central position: The monitor receives the same

balance of color signals

2. ENHANCE position: The blue color of the

monitor

is brightened by the addition of a

fifty-percent-green signal.

3.

TEST position: The color signals to the monitor
are internally connected to the 3279 CRT, thus

allowing direct comparison of the two displays
(except for the separator line and Operator
Information Area).

1.2.3.2

Sync Polarity Stritcb
This switch is used to select either positive or
negative sync pulses at the sync output socket.
devices attached at the same time will receive the
same polarity.

1.2.3.3

SIgDaI

This indicator lights when either

Test Indicator

as

the 3279 CRT.

• The synchronizing signal is faulty,

or

• The Video Control Switch is set to TEST.

All

3279MfM

Chapter

1.

General

De8o;riptil>n

and

Location

3279 MlM

*

DANGER

Pins

Use

*1

P3

Power
Edge

Connector

Pin Assignments

~~~

Securing,

Degauss

may be-up

to

probe,

IBM

Part 1749249/1749250.

+12 V

±12 V Retum

3

-12

V

103 V Return

4

103 V

5

Ground

6

Ground

7
8

LOPT

.lOPT

9

10

Line

Input

Line

11

•

Degauss

12

Degauss Return

13

• - Neutral

14

Neutral

15

Ground

16

Test Points are shown
as

bullets ( • )

Supply

-------,

___

COil

250 V above ground potential

Return

Test

Point

Test

Po-int

Input

---..

Brightness 2 To

Chapter 1. General Description and

Skip

Skip.

Vertical

Sync

-5V

Gnd from

A3

+12 V LOPT

Display Ready

-

- Display Ready

I ntensity Override Sw 4

Intensity Override Sw 1

+6.3 V Return •

+5V

+8.5 V

+8.5 V •

+5 V •

Gnd •

+103 V •

Brightness

Color Balance

-135

V •

+70

V •

+6.3 V •

Pot

26 Horizontal
27
28
29 4
30 5
31
32
33 8
34
35
36
37
38
39 14
40
41

42 17
43

44

45 20

46

47 22

48 23

49

50

Analog Card

Hariz

•

Vert

3

•

o V

form

-5

•

o V

to

6

7

o V

to

9 o V

to

l)

o V

to

11

"Power

12

Input

13

+103 V Return
+103 V

15

Brightness 3

16

Brightness 1

18

Intensity Override

Brightness 2

19

Balance Pots Ret

21

Heater (6.3
+70 V to
+70 V Return

24

Heater (+6.3

25

P4

Edge

Connector

Pin Assignments

V

security key

Color

A,af

LED Card

Prohibited

Sync

Sync

Sync

A3

A

Good"

V)

Video

Sw

Switch

(+5 VI

Return

VI

Loclltion

lock

Sw

2

(-150

V/39

1-4

kUI

P12-----~~~

Figure 1-2. Display Unit -

Front

View with Bezel Removed

Top

Card Connector

Identification

Card Socket
Identification

For logic card locations,

see Figure 1-6

Internal

Cabling

A2

to

power supply card

A3

to

the

enclosure

to

amplifier and video cards

to

keyboard connector

to

G4f

crossovers for M

to

G5

RC

G2

G3

A5
05

Figure 1-3. Display Unit - Rear View

3279 MIM

Sync
Polarity
Switch

Signal Test

Lamp Control

Chapter

1.

Video

Switch

I

Video

Output

Facility

General

Description and Location 1-5

Sync

,

Red Green

Output
Sockets

Blue

,

3279 MIM Chapter

1.

General Description and Location

\-6

Analog Card

,

View

hole

CRT

filament

Jumper

*

**

*

**

**

o HCENT

for

***

Two

Factory

preset (some presets are

Four

Static Convergence Controls

DANGER

Ensure the insulated covers are

transistor

in

these

(1

kV pkl

two

potentials

Amplifier

(J)Q:.~:PURITyA

BLAT0B~}

G0R~

MIN ~ 0
MAX

~

PI?

All

ground

wires

only

on

positions

as

the

Card

o STATIC

4BLAT

GAIN*

Q}COLOR

~

S BALANCE

1011

I

(

In'

\"

~p'4

I'

•

\

1'1'2

L."'.l_

Video Card

(for

Test Points,

see

Figure 6·10)

early

level cards)

in

place on

cases are

Test Points

alpl?S

any

at

dangerous

(see

Figure 6-11) Power Supply Card ***

N

Convergence and Purity

Coil Assembly

Figure

\-4.

Display Unit - Rear View, Open

Cathode
Tube

& Coil

Assembly

Bezel

Ray

EHT

Connection

CRT

Label

Main

Enclosure

Assembly

Audible
Alarm

Deflection

Coils

Analog

Card

Figure 1-5. Display Unit - Interior View

EHT Bleed

Assembly

Convergence

IPurity Coil

Assembly

Amplifier

Card

Grounding

Plate

Top

Card

Connector

Video

Card

Logic

Power

Card

Gate

Supply

3279

MIM

Chapter

1.

General Description

and

Location

1-7

3279

MIM

Chapter

I.

General Description and Location

1-8

220'

02

33,

,13

Pin

assignments

For jumpers, use assembly

~

Pon

/ Lpan

..bcSIa:=!

BCD

3

4

as

shown

j

453443:-\

452655~

!==CIIIIa~

.~

.::

~

'"

E F

-+--+---

it

i<

\

~i<

•

"'-

--

"0

.c

~

til

"0

~

~

0

0:

G

i<

~

o

u

~-

a:

u

~

§,

~

i<

c

~

a.

.c

0>

.J

TOP
BY

H

w

x

Y

§ Z

Top

Card

Id:ntlflcatlon

* Feature

** Model B

Notes:

1.

2.

only

If

Video

Output

Facility

is

Mlhen

installing Top Card Connectors ensure

into the card and the part number reads from top to bottom. Check that the cover and

label have been installed correctly.

installed, line

control

card

is

replaced

that

the longer (curved) pins are plugged

J

by

video

output

CARD

MODEL

card.

22

33

CONNECTOR

AND
Model A Model B

C3·D3 C3·D3

C4·D4
C5·D5

~-----L

LA

FEATURE

D2·E2

C4·D4 C4·D4

____

YO

with

D2·E2·F2

C3·D3
E3·F3

i---~-"

PS

Figure 1-6. Logic Card

and

Top Card

Connector

Locations (card side)·

1.3 Keyboards

1.3.1

Scan Codes

Pressing a key generates a seven-bit scan code that

is presented serially

code for a specific key position

The control unit translates each scan code into the

appropriate character

1.3.2

Break Codes

Several keys, including the reset key, produce a
second scan code (called a

is released. The break code for the reset key

ignored by

1.3.3

Keyboard Cable

This cable carries the control and data signals

between

the
provides the
Figure 6-12 for details).

1.3.4

System Upshift

System upshift cannot be selected from the
keyboard; it is controlled by the application program
and

applies

is

in upshift mode,

or

IDPA,

Characters

entered by an operator using the override capability.

1.3.5

Keyboard Type Identification

The keyboard logic card contains four pairs

that

must

keyboard (see Figure

1.3.6

Keyboard Lock

The

keyboard can
characters are ignored by the control unit).
data, for example a 'reset'
accepted.

The

operator
change in
clicker normally clicks
but

stops clicking

operator

has chosen

normal operation, then- keyboard lock will cause

to

click at each key depression.

An

)(

is displayed

Area

when

to

the control unit. The scan

is

a1ways

the same.

or

function.

'break

code') as the key

the

control unit.

keyboard

and

+5

V supply for the keyboard (see

to

all keyboard types. When the system

processes only specified characters.

other

be

jumpered

is

made

the

action

the

keyboard

the display unit.

the

control unit

than

those specified may be

to

6-11).

be

'locked'

aware of keyboard lock by a

of

the

once

after

keyboard lock.

to

turn

in

the

is

(3274

indicate the type of

(that

is, keyed

scan

code, may still be

keyboard clicker.

for each key depression,

off

the clicker for

Operator Information

locked.

If

It

or

of

Specific

the

is

also

3276),

pins

The

it

1.3.7

Numeric Lock (Feature)

The numeric lock feature

keyboard jumper in position 1

jumper block. This feature limits the characters

that

can be

entered

o through 9

period

(.)

or comma (,)

(-)

minus

The DUP key remains active. Depression

other key while the cursor

causes

the

keyboard

)(

* NUM in the operator infonnation area.

RESET

Press

1.4 Tools

The following tools and test equipment are required

for maintenance of the 3279.

Item

Insulated probes·

General

Miniprobe**

GLP
Key top puller

Keylock retaining nut wrench

MR

C test card

SLT jumper (3)

SLT

Adjusting tool
Metric tools
Alignment mask
Isopropyl Alcohol
Lint-free

to clear the locked condition.

and

logic probe

extension cable

pins···

cloth

For use with standard
This probe

(up

to

15 volts)

For use with jumpers on some top

card connectors

is

selected by installing a

of

into a numeric field to:

is

in

to

a numeric field

lock with the symbol

Test Equipment

CE

is

for use on low voltage

meter

the keyboard

of

IBM

Part

Number

1749249

and

1749250

453212
453718

453605
9900373
4418787
1742659

452655

453443
1864853
1749235
4423472
2200200
2108930

1D

any

3279

MIM

Chapter

1.

General

Description

and

Location

1-9

3279

MIM

1.4.1

Ge"eral Logic Probe

To use the General Logic Probe (GLP),

453212, set the switches as follows:

Technology

Latch

Gate

Ref.

Power the probe from any D03 pin (red wire
+5

V) and any D08 pin (black wire, ground). The

ground lead

connected to a nearby ground.

Test

GLP

D08.

MULTI

NONE
GND

on

the probe tip must also be

operation by probing on D03 and then

IBM

Chapter 1. General Description

Part

and

Location

1-10

Chapter 2. Maintenance

1.1 Maintenance Plan

The maintenance plan for
of:

1.

Problem determination procedures (performed by
the customer using

Guide,

which is located under keyboard

handrest).

2.

The

General Failure Index

QOOO)

for simple symptoms.

3. The Maintenance Analysis Procedures (MAPs)

(referred
2

of

this manual.

4. Intensity override (section 2.4).

5. Offline test modes (section 2.5).

6. Online tests (section 2.6).

7. Adjustment procedures (see Chapter 5).
FRU

removal and replacement (see Chapter 4).

8.
FRU

locations

Catalog

at

DANGER

Do

.."

Iltmltpt

It.

lfItIdti,..

f-

1.1 General Failure Index

This section has been moved to MAP 0000.

1.3

MAPs

This section also has

1.4

Intensity Override

To

engage intensity override, turn and hold

brightness control
override turns
electron-guns

the

to

in section 2.3) which comprise Part

can

be

the back of this manual.

to

...-.It% FR

been

fully

on

the

red, green, and blue

at

maximum brightness.

Aids

the

3279

assumes the use

Problem Determination

(GFI)

(see MAP

found in the Parts

Us

"".,

ptJW#"

OIImM

moved to MAP 0000.

counterclockwise. Intensity

the

When the
three rasters
unless the Test Mode 3 jumper (D2Y08 to D2Y09)
is installed. Test mode checks analog and

associated circuits.

When the
the 3279 is connected to an active control unit, the
red. green, and blue rasters should be converged.
Skip and display geometry can be inspected.

Normal/Test

will

Normal/Test

switch is set to Test, Ihe

be unconverged (see Figure

switch

is

set to Normal

2-1)

and

1.S Test Modes (Offline)

Note: When the display station is offline. the

convergence correction circuits are no/ active. This
will

be obvious when more than one color

displayed.

2.5.1

Test Mode

1. Set the Dualcase/Monocase

A,a.

2. Set the

3. Verify operation of Test Mode 1 by checking

Normal/Test

to Test. The Test Mode 1 pattern

the displayed pattern carefully against the
pattern shown in Figure 2-2.

MAP 0000 page 2 and then go to MAP

read

0100,

Entry Point

1:

Patterll

(A,a/

switch to Normal and back

BB.

is

A) switch to

is

displayed.

If the test fails,

3279

M1M

Chapter

2. Maintenance Aids 2-1

3279 MIM

Chapter

2.

Maintenance Aids 2-2

*At

regular intervals across

double

skipline

as a dark

line when converged.

the

appears on Maqel 3. Each

screen on Model 2. Only the

skipline

Figure 2-1. Intensity Override (Test Mode)

appears

Test Pattems for Models 2, 3.

Line

1

~e

laUa';

i.ouae

Line 2

iounAEiOUAOY

ABCDEt'~UlJKLMNOPQRSTUVWXYZ

AEEIOUYCA.EIotiAi:i60fi-Ei6uNabcde

A':

~Ac;'e

ii'ig67><l1 ) ()

(='"

/'1:

fghi

jk

7'

lmnopqrstuvwxyz22

$¢£"PtoB

12

3456

~ac;-;;

789"

H@%

OplnfArea

Figure 2-2. Test Mode 1 Pattern

2.5.2

1.

61234567><{})

Test Patterns for Models

Line 1

f·)fft::<~JJ)tJ"I*~:"/H137')I>~O'J:'''·.

Line 2

ABCDEFGHI

Test Mode

Test

Mode 2 is

display is loaded with the Test Mode 1
of characters. Ensure
switches are set as described in section 2.5.1.

(}

(='"/\I:?I$¢£¥Pt<le123456789~~t@,_&-.,q-'-o,,"'-··",

2,

3 with Katakana or Japanese-English Keyboard:

-

JKLMNOPQRSTUVWXYZli0flCi

2:

Keyboard

entered

automatically

that

the display unit

after

pattern

the

~elou~oy~e~

r

J,

"7<

?IH

13,-"abcdefgh I

*012345b7)

( (1) () ( =

2. Verify operation of Test Mode 2 by
that

the characters
from each keyboard key are the same as shown
on the keyboard layout diagram in Figure 2-3.
If the test fails, read MAP
to

MAP 0100, Entry Point A.

Jklmnop~rs\uvwxyza.kii

".

/\1:

?ISU¥P.1I01Z3451078'11l§'@%-

that

appear

!i¥\

U

on

0000

page 2

76/BB·Key

Keyboard

lOUUC

checking

the screen

and

only

go

Figure 2-3. Keyboard

3279

MIM

Character

Interpretation for Test Mode 2

Chapter

2. Maintenance Aids 2-3

3279

MIM

2.5.3

Test Mode

Notes:

1.

Use

the keyboard diagram (Figure 2-3) to
identify the keys listed below.
by

key

top symbol (although the

identical).

2.

I9refers to the

3. When a single character
'Results' cl!/umn it will appear
the first

(OIA) (bol/om left hand corner). It

Area
shown only

4

6

8

9

10

11
12

13 Set the Normal/Test switch

14
15
16

J:

Commands

CONTROL

pOSition

of

the Operator Information

when

the

r~sult

Step
(See Notes

1

& 2 above)

I

2

3

to Normal and bock to

Do

two

key

(see

is

shown

on

is important.

Press Keys

I9B

BBB

C

@lJ
@IN

19

M

19

DO

I9c

@lBW;
@lGA

@I

B 0 I

@lBOQ

@I

K I

4

8

not identify

may be

Figure 2-3).

in

the

the screen in

is

ABC

...

D ...

Test

Chapter 2. Maintenance Aids

4.

The display will

otherwise.

5.

If

any action fails, recheck the test sequence

and the

MAP

read

Perform the test in sequence (or the results are
unpredictable)

Enter

Test Mode 3 from Test Mode I

pressing the

directly using a jumper - see section 2.7.

Result
(See Notes

3 & 4 above)

2

6

Test Mode 1

See Keyboard

Monocasa

ABC
cursor; cursor advances

Character over cursor is
displayed
position and cursor

Line I displays
as

'a'
way along the line.
Display turns red.
Display mainly blue,
some red remains.
Display turns green.

Cursor blinks.
Cursor
Cursor returns but display
is

inhibited.

pattern

ID

Sw_

A,a A

0 A

a.

&

1 B

... appear over

at

OIA first

two-thirds

is inhibited.

table in Figure 6-11

<5

of

be

green unless specified

.. exchange logic card C2, then D2, then

0000' page 2 and go to MA.P 0100.

as

follows:

CONTROL key (Figure 2-3),

is restored

Sacurity

Kaylock

Not

installed

On

(clockwise)

Off

(counterclockwise)

.dvances

as far

the

or

2 by

or

2-4

Step
(See Notes

I & 2 above)

17
18

19

20

21
22

23

24
25 F
26

27
28
29

30

Set Normal/Test switch
to

-1!Iormal,

then

Press Keys

o

2

@lGG

@lGG
@lBVA

@lE5

@lv

@lM
@lB

@l

19

Test

3 3 3 3 3

5555599

W

iii

S 3
B Q 9

End

of

Result

Notes

(See

3 & 4 above)

Pattern returns to normal.

Cursor

is

blinking

reverse video.

is

reverse video

Cursor

Display contains all

reverse video cursor moves

to

OIA

first position.

OIA

fills with

Cursor moves to start of

line 2.

CUTsor

moves to start

line 18.

A

5

333335555599

CUTsor

moves to last '3'

Cursor moves

TEST

MODE 3

SEQUENCE

and

(5

<5

of

... appears

to

on

in

first '9' in line 18.

line 18.

line 18.

2.6 Online Tests (Control Unit
Station)

Description

4-color
Error

log for
Control
Status of
Reset error log for
Display control unit storage
Display key
Operator
7-color

on

3276

control unit.

on

3276

control unit or IDPA.

3219

Test

o

2"

3

4

5··

6·
7

8··

MIM

Not
Not

available
available

to

Display

test

pattern

3278/9

unit configuration

attached

devices

3278/9

DCB

information

convergence utility

ECS/PS

test

pattern

data

Refer

10

Section 2.6.2
Section 2.6.3
MCM
Section 2.6.4
Section 2.6.5
MCMfoMIM for

MCMiMIM

See section 5.3.3

See section 2.6.7

Figure

Chapter

and

for the control unit

for the control unit

2-7

2.

Figure

2-4

the

control unit

and

Maintenance Aids 2-5

3279

MIM

2.6.1

Running Online Tests

I.

If the

'READY'

symbol

is

OIA, set the
back to Normal.

2.

Hold down the ALT key, press the TEST key,
and release both keys.

OIA.

3. Key in

number,
reported upon, and n

Notes:

a.

b.

c.

Normal/Test

pp/

n and press ENTER. (pp

0-31,

of

~

If

pfJ

is omitted the test

requesting terminal.

The / must always be keyed in.

If

n

is

omitted, test 0

not displayed in the
switch to Test and

TEST appears

the device to be tested

is

the number

is

is

run on the

run.

in

is

of

the

the

port

or

tile test.)

4. To end the online tests:
ALT

Hold down the
key, and release both keys. TEST
disappears from the OIA.

key, press the TEST

5. Error Indicators. (Press RESET to continue.)

)C

-f

(Do

a.

... you tried to select an in-session terminal

for

b.

)C

number) ...
or

test format

slash / and no spaces).

Note:

an IDPA.

2.6.2

2.6.2.1 Routines Only

The IBM 3276 control unit precedes the main test

with two transmission test routines.

Note: Before going

read the danger notice at the start

not enter, Function not available)

Test

O.

*.#? (Do not enter,

yOll

address,

)C

used an invalid test number,

or

wrong test format. (Begin

at

position 0

c-f will appear instead

Test 0

for

IBM

3276

Terminals Connected to

Controller

to

a specific

Op

check, What

and

use only

if

MAP

of

MAP

connected

reference,

0000.

one

Test 0 - Routine 1 (3276 only)
This routine 'verifies the basic

Adapter) card functions
command decode, and so on. Driver/Receiver

TA

(Terminal

- register, SERDES,

operations are not tested.
the test stops.

Display Station Maintenance Information

Manual,

Test 0 - Routine 2 (3276 only)
This routine

communications link

receiving a

the

test stops.

to MAP

2.6.2.2 Four-color
This test is used to verify

The correct control
attribute byte.

3279

The
The interaction

or

IDPA.

The action of the

To

run

test 0, see section 2.6.1.

J. Ensure the

2. The alarm sounds when one

Figare 2-4 appears.

3. Verify
white

and

changed to

If

to

this test fails read MAP

to Map

the

4. Reset

5. The

pattern

port number pp.

Chapter 2. Maintenance Aids

See

If

IBM

3276 Control Unit

SYlS-2oo4.

is

the

Link

test.

by

POR

0100,

issuing reset

response.

Read

MAP

Entry

Point CC.

Pattern

Test

the

of

a field by the field

0000

following:

alarm.

of

the 3279 with the control unit

0000/00

switch.

0000/00

switch is set to

that

the red

and

green when the

00.

0500

entry point A.

0000/00

appears

blue fields become

0000/00

0000

switch to

on

the device connected to

an

eITor occurs,

It

verifies the

and

If

an error occurs,

page 2

0000

of

the patterns

switch is

page 2, and go

0000.

and

•

2-6

go

in

6.

If

the

test request was to a different display, a

suffix

is

For example:

Control

(I

= IDPA)

appended to

Suffix Meaning

+

-

0

Unit

the

Successful

Control
coaxial device
cable failure

Display
powered

Identifier

I/,

/

/

White
IntensIfIed
Protected

NON precedes DISPLAY
non

display

only

field

if

the blanking fails.

request message.

unit

or

off

o

I L failed

~test

Port

TEST:

nnnn;pp

?SEL

that

PEN

&SEL

DISPLAj

is visible

SEL

P'~I

Red Green
Intensified
Non

but

INSERT

protected

is

a

>SEL

PEN

PEN

C\

-~

Non

protected t Attributes

All

other

fields

blue and

protected.

attribute

bits.

White

f

only

in

the

See Figure 6-17

test

patterns are

for

Figure 2-4. Online Test 0 Pattern

3279

MIM

Chapter 2. Maintenance Aids 2-7

3279 MIM Chapter 2. Maintenance Aids 2-8

Interactive Test

2.6.2.3
This test permits a visual display of the operation of

the keyboard, selector pen. and

control unit or

IDPA.

Action

1. Ensure that the

2. Move the cursor under the

3.

4.

5.

6.

7.

is

set to A.a.

switch

C of the CK field.

Press the insert
Press keys J K

Press RESET.

Test the Sel Pen feature.
(You may simulate the Sel
Pen by using the cursor and
the cursor select key):
a. Touch the pen

field on the second line.
(If

)(

-f
press RESET and retry with
increased brightness.)

b. Repeat step
c. Touch the pen

field on the third line.

d. Repeat step

To test the MRC feature:
Move the cursor to the
first position in the
fifth line (line below
the test pattern), and
pass the MRC test card
through the reader.

MR

C with the

A,a/

A

(II)

key.

L.

on

?SEL PEN

appears in OIA,

a.

on

>SEL

c.

Results

A appears in the OIA.

)(

* > appears in OIA

in the fourth line becomes

)(

* > and A are erased.

The second line becomes:

The second line becomes:

PEN

The third line becomes: &SEL

The third line becomes: &SEL

If the read operation
moves a number of positions equal to the number
of characters
light on reader turns on, and
in

the OIA.

If

the read operation
light on the reader turns on; press the reset
key and repeat the test from Step 7.

on

and

j

>SEL

?SEL

is

successfUl, the cursor

the MRC test card; the green

is

unsuccessful, the red

the field

k£K

)(

-f

•

is

PEN

PEN
PEN

PEN

SEL

SEL

?SEL

>SEL

displayed

PEN

PEN

PEN

PEN

Failure In

Keyboard
Sel

Pen

MRC

Read

MAP

0000 Page 2

Then Go to

0700 Entry Point A
0800
0800

MAP

Entry Point
Entry Point

DO
EE

2.6.3 Test 1: Error Log

Online Test 1 allows the error log for any device
attached

to
be useful to reset the error using Online Test 4
before testing, but note the contents of the log
before doing this.

TQ

2.6.3.1 Oaline Test 1 DIsplay:

pp/1

05XX
XXXX

Figure 2-5. Test 1 Pattern

The most recent 32 79 display error code appears in
the first two digits
by

area.

For
is logged as '05'.

3274 error codes for the 3279 display are listed in
Figure 2-8.

the control unit to be inspected. It may

run Test I, see section 2.6.1.

3274

205

Control

()(

or

mBA

XXXX
XXXX

XXXX

on

'2'

when it appears in the operator information

example, an error code

line 2. This code is prefixed

of

~

UDit

205)

2.6.3.2. OnIIoe Test 1 Display: 3276 Control Unit
The pattern shown below is displayed. This
different from the 3274 because

recorded and a count is kept.
Note that the 3276 error code is the same as that

displayed in the OIA. For example:
logged as 42.

•••

yy

•••

Xl

XO

xx

xx

xx

X2

xx xx

03

OX

IX
2X
3X
4X

5X

6X
7X
8X
9X

The above example shows that error code 42
(keyboard overrun) has occurred 3 times. For error
code interpretation, see Figure 2-9.

X3

xx

ALL

X4

)(

X5

xx

is

errors are

~ 42

is

3279 MIM

Chapter

2.

Maintenance Aids

2-9

3279 MIM

1.6.4

Test

3:

Status

Summary

Chapter

2. Maintenance Aids

1-10

01234567
11101-11.

DPS C DD

~

XXXX

Notes:

Line 2 symbols

1

Attached

TA

detected

a

No
is

Figure 2-6. Test 3 Pattern

Test 3 gives
to the control

To run Test 3, see section 2.6.1.

1.6.5

Test

Test 4 resets the error log. Its operation can be

verified with tcst
the Reset operation was successful.

To run Test

1.6.6

Test 7: Operator Convergence

Utility.

See section 5.3.3 to use this test.

refer

device

card

failed,

or

error.

T A

card

is

attached

installed,

to

this

data

about each display unit attached

unit/IOPA.

4:

Error

1.

A'

4,

see section 2.6.

....

.

.. ..

.•...

XXXX

XXXX

to

line 1 port

has

device

port.

Log

power

or

Reset

on.

is

disabled

the

numbers

device

+' response indicates

I.

-------

-

..

------

XXXX

because

has

that

as

follows:

power

Configured

See

Note,

D = Display
P =

Console

I

S =

System

C =

1052

Blank =

---

of

control

off,

or

1.6.7

To

run Test 8, see section 2.6.1. The

in Figure

Extended

If
not
OIA

If Test 8 fails, read
MAP

Not

The

last

line

error

summary

documentation).

unit/IDPA

no

device

Test

8:

Symbols

2-7

is

Character

installed, the symbol

and

the test will not run.

0800,

Entry Point

Port

printer,

printer,

Console

connected

may

7-Color

(PS)

displayed.

MAP

Numbers

for

example

for

example

Printer

contain

counts

(see

and

Set (Models 2A

)(

* #? appears in the

0000

page 2

Cc.

3287

3289

control

unit

Programmed

pattern

shown

and

3A)

and

go

is

to

Une

1

(~'#,J

5

8

10

11
12

rmD

~:~~:~,~2

PS

<;:()~()~

if

~A

~A

iB

~B

~B

2 3
2 3

~A

~B

~A

~c

~c

~D

~D

4 5

4 5

~E

~E

Une

3

iFl \ ~ are

5 (C) ~ are

6

7 7 (F) P

6

7 8

(C) ~ 5

10

11
12

Notes:

1.

If

PS

fonts
rep/aced
lines

10,

2.

Feature PS2 gives fonts A and

gives 4 extra fonts, C through

3.

Color

is

(C)

Character

Attribute.

AND

IC)

& TEST

IF)

with

white

is

red, 3

is

yellow, 7 is

font

A

font

B (skip supressed)

font

A

installed, the

or

(F)

are reserve video

centers

pink, 4 is

omitted

B.

F.

Extended Field

PS

IC)

& COLOR IF) blink

red

red

is

blue, 2

is

turquoise, 6 is

~

is

red

from

~

is

red

from

~js

red

from

are

not

by

green period and

11

and

12.

green unless stated. Control

Attribute

green

white

~ & ~

is

on

Feature

PS4

is

by

Figure 2-7. Test 8

2.6.8

Error Codes

Try

to

reset

key

or

by setting

then

back

recurs, consult the appropriate table below.
In

the

following error code tables, FRUs are listed

in

order

of probability

following before exchanging any

Seating

• Dirty

or

connector contacts.
Voltages

3279

MIM

Pattern

the

error by either pressing the RESET

the

to

Normal.

of cards

bent

on

Normal/Test

If

of

and

board pins

board pins.

cables.

switch to Test

the failure persists,

failure. Check the

FRU:

or

card/top

card

or

See Figures 6-4 and 3-2 for voltage pin locations
and

section 5. t for voltage tolerances.

Exchange or repair suspected
and verify correct operation each time.
suggested actions do
investigate seating
cables and board wiring, then read MAP

and

go

2

to

MAP

and

0100

FRUs one

not

cure

the

Entry

Point

problem,

A.

continuity of associated

at

If

0000

a time,

the

Chapter 2. Maintenance Aids 2-11

page

3279

MIM

Chapter

2.

Maintenance Aids 2-12

3274
Code

202
203

204
205 *
206

207 *
208

209
210 * Keyboard

211
212

222
223

224

225
226
227

228
229 82,
234
295
299

2%%
2EE

* Do

Check

Note:

Figure 2-8.

Repair
(3279

02.

02,
02,
02,
02,

02,
02,

02,

then cable, then

02,

*

Keyboard logic,

*

then

G4, (selector pen),

then
E2,
G2

E2,
E2,
E2,

82, then 02, then

E2.
02,
02,

}

the

control unit and the customization

ECS

card switches,

For

other error codes,

Error

Action

logic

card)

then features then
or

C2.

then

C2,

then features. Unsupported feature attached

then B2, then features. Incorrect feature response
then

C2.

then

C2.

then

C2.

10

jumpers,

then features. Invalid status received

cable; then 02.

02,

then

then

02.

(MRC), then 02.

then

02.

then

02.

then

02.

or

02,

or

then

C2.

then

C2.

Codes

From

B2.

02.

C2.

C2.

C2.

PS

jumper, and keyboard jumpers (see Figure 6-14).

see

control

IBM

3274 Control

Error

Code

Control

unit

buffer

overflow
Feature Bus
Storage

error

on

initialization

Lost

Operation Complete
Invalid (unexpected) Operation
Complete
Command queue failure
Invalid keyboard attached

(not configured)

Invalid scan code received

Invalid selector pen status

or

command queue failure

ECS

buffer

Invalid MRC status

command queue failure

ECS

status/initialization failure

ECS

command queue failure

ECS

write

queue failure

Storage

parity

Storage

parity

Switches

not

Invalid

type

Non-command queue cycle

sharing machine check

Not

customized

support

the 3279 features?

unit

or installed

RPQ

Unit

Explanation

keystroke/status

error

(Device Check)

parity

error

or

alternate command

error
error

set

to

include APL

A adapter status

for

attached features

documentation.

this

display

Repair

3276

Code

41

42

43 G2 (MRC), then
44

45

55
56

60

61
70

71

72

73·
74

77

78

Action

(3279

logic

card)

Keyboard logic, then

cable, then

Keyboard logic, then 02.

G4 (selector pen), then

02,

then

C2.
G2 (MRC), then
82

then

02,
82
G2 (MRC), then
G4 (selector pen), then
02,
C2,
C2,
C2, then

02.
02,
02,
02,

then

then

02,

then

then

C2.

then coaxial cable, then

then coaxial then 02. Adapter receive parity error

02.

then features. Feature timeout
then

C2.

then

C2.

02.

02.

02.

02.

C2.
C2.

Error

Code

Explanation

Invalid scan code received

Keyboard overrun
MRC data parity

Selector pen data parity

No response

Storage parity

Storage parity
MRC timeout
Selector pen timeout

02.

No

response

Data parity
Lost Operation Complete this display

Device check
POR

signal

error

from

MRC
error
error

from

terminal (timeout)

error

(buffer

error

parity)

error

• Do the control
Check

Note:

For

Figure 2-9. Error

1.7 Jumper Positions

A number
d!splay adjustments

MIM

3279

unit

ECS

card switches, and keyboard jumpers (see Figure 6-14).

other error codes,

Codes

of

jumper positions

and

and its features support the 3279 features?

see

control

unit

From

IBM

are

fault-finding.

available to

or installed

3276 Control

aid

Unit

RPQ

documentation.

Chapter

2.

Maintenance Aids 2-13

3279

MIM

The

positions and their uses are listed below. Note

that

every jumper position is activated when

grounded. A recommended ground pin is listed.

Chapter 2. Maintenance Aids

2-14

Name

Force White

Color Balance Bars

Reverse Video

CE

Jumper

Pen Detect Lines

Power

Storage

Force Characters

Disable Skip

Force Green

Force Blue

Force Red

Pin Ground

C2W07'

C2W28

C2W09" C2W28

D2Y02'

D2Z04
or
E2Z04

D2Y09" D2Y08

D2YlO'

D2Y08

B2B08 B2D08

C2G06

C2J04

D2108

D2J08

C2S11 C2U08

C2S12

C2U08

C2U11 C2U08

Use/Description

All characters

Good test

screen, used to

(at

A number

high, are displayed (must be characters
on

All characters are reversed.
check purity.

When the
Test position, this jumper allows
directly
the
attributes are blank,

are interchanged.

of

screen center).

of

screen). Color balance.

Normal/Test

to

Test Mode 3 without resetting

refresh buffer. Nulls display,

])isplays selector pen detect lines.

Removes power from

convergence check. Used in setting

convergence.

Easy method

characters when online to check overall

convergence.

Inter-row skip (Mod 2 only) is disabled.

Separator line moves

adjusting image height.

Green video

Used to check green video amplifier
gun.

Blue video is forced permanently on.
to check blue video amplifier and gun.

Red video is forced permanently on.
to check red video amplifier and gun.

"See Figures 1-6 and 6-3 for top card connector pin numbering.

on

the screen become white.

convergence over whole

set

up static convergence

colored bars, 2 characters

Used to

switch is set

entry

and

red

and

white

storage

to

force a

of

filling screen with

up.

Used when

is

forced permanently on.

to

up

and

Used

Used

the

Chapter

3. Functional

Components

LCC

BLC

Input!

Output

SEROES

Control

Logic

F81l

FBO

C2

02

Convergence

Logic

B2

LCC

BLC

LCC

Clocks

Refresh

Storage

Character
Generator

Color

Control

Video

Outputs

C2

02

02

C2

Video

Output

FacilitY

*Optional

Figure 3-1. 3279 Block Diagram

3279 MIM

MSR/MHS

Power
Supply

Card

Chapter 3. Functional Components

3.1

3279 MIM

3.1 Power Supply

The power supply switches the line voltage at high

frequency using pulse width modulation.
The modulated voltagc
windings of a power transformer. The outputs from
the secondary windings are rectified to produce the
following voltages:

Voltage Tolerance Max. Ripple

(V

de)

+103
+12

-12
+8.5
+5

-5 10 0.15

The transformer incorporates a feedback winding to
control the pulse width and hence the output
voltages.

A signal from the analog card (LOPT sense) locks
the power supply oscillator to lhe line timebase
frequency, to eliminate interference on the display
caused by the high frequency modulation. This
signal also indicates to the power supply an

overvoltage condition on the analog card.

If

either the overvoltage or the overcurrent

protection mechanism shuts down the power supply,

up to seven times, approximately once per

it retries
second and the
flashes at this rate, provided that the failure
on

the

+5

V line. An audible click may

the supply at each retry by listening near the

from
ventilation slots above

is

located

A fuse
fails, the power supply card must

is

fed to the primary

(±%)

6 0.7

10 0.4
10 0.4
10
10

'POWER

on

(V

0.26

0.15

GOO~'

the

power supply card.

the power supply card.

pk-pk)

indicator light 1

is

be

heard

exchanged.

If

be

not

it

Chapter 3. Functional Components

3.2 Analog Card

The analog

drives for the CRT scan coils and includes the

extra-high-voltage
logic

synchronizing signals, the time bases on the analog

card lock to the imposed frequency.
The line output transformer

horizontal drive circuit. provides the following

card

generates horizontal

(EHT)

is

supplying horizontal and vertical

power "'pply. When the

(LOPT).

and

in

vertical

the

supplies:

Voltage

(V

de)

+25

-25

+12
+70

-150

+280

to

+6

kV

+6.3
+25

kV

The analog card receives a further signal ('skip'),
which forces the raster to move vertically a defined
amount (see Figure 2-1).

To

start up, the analog card requires ±S V dc,

+8.5

V dc, and + 103 V

turned

on
produces the additional supplies. These enable the
vertical drive circuit to start and this initiates a
delay. After
(indicator
voltage unblanks the screen.

Where Used

- On-card use, deflection
amplifiers

- On-card use, deflection

amplifiers

- On-card use and card B2

- To video card

- Through brightness control,
amplifier card, and color

balance controls to CRT grid

- Focus circuits and CRT anode

+450

- Focus circuits

- CRT filament (see Figure 6-7)

- EHT supply to CRT

the horizontal drive circuit

45 seconds DISPLAY READY

2)

turns

dc.When

on

and a change in CRT grid

the power

starts

and

is

3-2

LOPT

-

LOPT

-:-.0

Retur

n

See Figure

Power Supply Card

9 8 S 4

*

*

(

P3

I-r--

IS

..

~+103

1++103

-::-

-

14

[~8

~

Sense

(0

HI

Analog Card

6·4

for

voltage pins on Planar strips

V

V dc return

P4

340

290

30v
3SV

de

+S

-S

+8.5 V

+S V de

A2D03 - A3D03

-5 V de

A2B06 - A3B06 are each connected

o V

de

A3DOB - A3DOB

+8.SVdeA2Bll

d..

+S

V

-S

V

~

OV

+8.SV

A3

===

~

V

V

OV

'---

AS

rD

To

Video

Card

and

Amplifier

Card

*DANGER

Pins may be

-A3Bll

up

82

-

I"'

fo--+-

......

I

~

I

I

I

I

I

~

I

I

I

-

--

I
I I

.....l.-

Logic Gate: Card Side

to

250

V above ground potential

-S

V and

+8.S

through logic card

B2

only.

C2

r---

D2

-

u...

1---1-

r-

~

r---+-

I-----

~

_.1-

---

I

~

-2-

V

-'"

t-

I

I~

I

I

I
I

I

I

I
I

I

I

I

Ve

rtical

Co

nnections

de

Ma
Lo

gic Cards

by

Figqre 3-2. Power Supplies to Logic Gate and Analog Card

3279

MIM

Chapter 3. Functional Components 3-3

3279 MIM

3.3 Amplifier Card and Inputs

3.3.1

Conpergence Circuits

The convergence amplifiers drive the convergence

coils. which provide the necessary correction for all

points on the
3-3).

The current in the convergence coils
by data in a store which

scanning of the screen. The data

be altered by
ageing.

As

data

lost when power is turned off. the convergence

store

When the 3279 display

convergence logic card
reset' to the logic. This resets most registers and

sets the status to 'power on reset'. The next poll

from the control unit to which the 3279

connected detects the status and then reada the

SCreen

to the three beams (see Figure

is

is

read

the operator to compensate for CRT

in

the convergence store

is

supported by battery-maintained storage.

is

switched

B2

generates a 'power

controlled

in

step with the

in

this store may

in

the display

On.

the

is

is

on

Chapter 3. Functional Components

data from the battery-maintained storage and
processes it to set up the correct data in the
convergence store. This is normally complete
before the screen unblanks. The power
procedure also occurs when the Normal/Test switch
is

returned to Normal.

3-4

on

When the operator uses the convergence procedure
in the online tests. the data in the
battery-maintained storage

convergence store

Note that the convergence control circuits are
packaged

on

two carda (see Figure 3-3):

Logic caril
non-volatile stores and the logic.

• The amplifier card receives four convergence

analog signals from the logic card and amplifies
these to drive the convergence correction coils.

• The amplifier also may contain gain controls that

are factory-preset.

82.

is

is updated.

modified and the

(4Wx3H) carries the volatile

and

Line

Control G12
Card

»>-0-------'-4»

r;I3

012

Tp

Vert. 5nyc

P4

3

~

I;

PIS

Analog

Card

I

f,g

L...-.-.....t...:::..J" » I I

»l,J;16

>~>'1

[J

5kip

TP~--&...:..::...J

!~I

Convergence

Logic Card

5

503

>~)

U07

4

/:0

DO

7

I

)>-+---+»

506 0 06

)~)

505

0 05

L---..l...::!...J:1

Figure 3-3. Synchronization, Convergence, Purity. and Deflection Coil Connections

LJ

f'~

-12

V

I

I I

)>HB!d~:~:",

lsi

>>t-ffi!t

)+cm~1

~~::~ial

I

Amplifier

I

ItO

1

1'2

I

dl

I I Radial Card

Card

Deflection Coils

Convergence/Purity

Assembly

l'

II

j'50l!

2 Vertical

II;~~~,;~",

II

Purity Card

Lateral Card

I:

1

II

J

~~u;'al

113

IIJ~:~~:I

115

3279 MIM

Chapter 3. Functional Components 3-5

3279

MIM

3.3.2

Color Controls

Also located

color-balance potentiometers. These receive a

voltage
brightness control

minimum

color.

Two more potentiometers allow color purity
adjustments.

3.4

The
signals
cathodes (see Figure
supplies, the anode supply, and

voltages go through this

focus supply

3.5

The
and
Other

these.
of
light

The

pure,

blue dots are impure,

with a little green

balance
blue

that
of
colors will
colored.

Phosphor Dots
llIuminated

Red
Green

Blue

Red and

Red and Blue

Green

Red.

on

the

amplifier

of

between

-150 V de

and

and

Video

video

(tube

and

amplifies them to drive

Cathode

human

eye contains detectors for red. green,

blue light. These are

colors (and white) are

The

screens

3 phosphors which

when

they are hit by electrons.

red and green phosphor

that

is, they emit only

of

the colors. This

is

too dark. This means that

include blue will

the primary colors

not

Green

and

Blue

Green.

work in pairs

maximum brightness levels for each

Card

neck)

card

6-7).

The

is

Blue

card

wired directly to the

Ray

Tube

the

of

color

emit

red. green,

that

is, the blue light

and

red to improve the overall

is

be

changed. If the brightness

is

not balanced, the mixed

be correct

and

Color seen on
3279

Red

Green

Blue

Yellow

Pink
Magenta)

Turquoise (Light

Blue.

White

card

are the six

and

0 V from the

to

set the

receives the three video

the

CRT

CRT

filament

the

grid (brightness)

to

the

CRT

pins.

CRT

socket.

and Coil Assembly

3 primary colors.

seen

as mixtures

CR

T5

are made

and

dots

in

the

red

done

3279

or

green light.

because pure

any

mixed colors

the white will

Screen

(Violet.

Cyan)

of

blue

is

be

The

of

dots

are

The

mixed

Chapter

3.

Functional

Each

primary color has a
with a separate grid
figure 3-4.
accelerated and focused by a single
and

deflected across
deflection coils.
screen

at

slightly

Figure

3-4)

few millimeters from
small holes in the mask break each
seven smaller beams before they hit

phosphor.
directs

the

dots.
Another

group

of

the

CRT

anode.

These

convergence.

1.

Purity - These coils move

together under horizontal
to strike the shadow mask

2. Sialic Convergence

(mounted
and

the blue lateral static convergence
potentiometer
amplifier
be

aligned individually

screen.

3. Dynamic Convergence

distortion is corrected
correction controls.
beam is. however, slightly different. These
differences are corrected by the dynamic
convergence circuits. Voltage waveforms are
generated on the convergence logic card
fed

to
3 primary color images lie on top
another

difference in quality

Test Mode 3 compared with concurrent test

to

The

three electron beams are

the

The

three

different

which is

at

the

The

angle

beam

the

of

to

the

of

coils

between

the

are used to improve purity

on

an

assembly

(mounted

card)

allow

coils via the amplifier card.

all over the screen. Observe

Components

separate

control

EHT

correctly-colored

is

-

The

of

electron gun,

its brightness. see

screen by a single set

screen phosphor.

the beam

arranged

cathodes

Three

the

anode

beams

arrive

angles. A mask

voltage is located a

beam

the

at

the mask

around

and

the

three beams

and

vertical controls

at

the correct angles.

thumbwheels

on

the

CRT

on

the

convergence

three color beams to

at

the

center

-

The

overall deflection

by

normal pincushion

distortion

of

multi-colored images in

assembly

at

The

into six

screen

phosphor

the

the

common

and

neck)

of

the

of

each

Thus

one

the

the
(see

B2

3-6

of

neck

and

the

O.

or

Gun

Shadow

~ask

Shadow

Mask

Phosphor
Dots

(Triadsl

F 19ure 3-4.

MIM

3279

Sh

d a ow Mask

Chapter

3

. Functional C

omponents 3-7

3279

MIM

3.6 Convergence Logic Card (Location B2)

The convergence logic card (see Figure 3-5)
provides digitally-controlled analog signals for

convergence
storage areas that hold the definitions
currents required

digital information
and

assembly.

The·

through the
accessed and updated.

of

the display unit. The card has two

in

the convergence coils. The

is

fed to the amplifier

card

is

converted

card

connected to the base logic card

featUl"e

bus so that the stores

to

analog signals

in

the

of

main

the

enclosure

can

be

Chapter 3. Functional Components

3-8

Horizontal
Retrace

Store

Zone

Add,

Add,/

Cmd

Ply

Dec

Figure 3-5. Convergence Logic Card (B2)

Timing Model

Controls and

Horizontal

Sync Retaining

Hor'z

Chan

Reg

Vert

Chan

Reg

D/A

D/A

Sum

Horizontal Sync

IAnalog Ca,dl

Convergence

(Amplifier

Signals

Card)

3.7 Line Control

The

line control card (see lower part

contains:

• Circuits

• Main oscillator

• A serializer that converts the ROS outputs from

• Test circuits that force colored bar patterns

to

data

down the coaxial

feature clock.

the base logic card to drive the three video
outputs.

the screen adjustments.
(Video Output Facility only) Circuits

produce red, blue, green, and sync signals for

external monitors.

Card

(Location

handle transmission and reception

(14

Une

MHz),

Cl)

of

Figure

to the control unit.
dot

counter and

that

3-6)

on

of

3.8 Base Logic

The base logic card (see upper part

contains:

The display buffer, which holds the character
code for each position on the screen.

ROS which stores the character shapes.

The
is addressed by the display buffer and the
outputs are fed

• Attribute control circuits. The base attribute

byte defines the characteristics of the field.

Keyboard control circuits for keystrokes and

responses.

Logic for handling
display buffer. This involves the base
address counter which is also used by the
features as an address for

• The character counters.

• Feature bus controls. The feature bus is the

main path for transmitting

machine.

Card

(Location

to

the

Une

I/O

operations with the.

Dl)

of

Figure

control card.

I/O

operations.

data

around the

I/O

3-6)

It

3279 MIM

Chapter 3. Functional Components 3-9

3279 MIM

Model Bits

Feature I

Bus

In

_____

Counter

Chapter 3. Functional Components

Internal

Control

--<'---r~~~;,-l"----~t~~~~--I

14-

....

S

E
R

o

E

S

'1--

..

3-10

~NE-----

CTL.

I

CARD

I

(C21

I

PS ! --Red-

Serial,

I

--Blue----j

I

Figure 3-6. Base Logic Card

________________

.-_....IL

__

Serializer

'-

(02)

-, ----

__

.......J

and Line Control Card

Clocks I BASE

--

-

---

Dot

Counter Retlme

14

MHz

R

G

------+-r-------

B

r.O::-P:::t:::io::n::a:-1

(C2)

------.-

Osc

:-:V::id;::e~o~o~u::-tp:::u~t-1------..

lOGIC

~RD

(D~

--

V.r~n~

\.to

Analog

Card I

g~:~~:1

\

Cable

Video

f

S.'.·9

to

Card

_ Sync

R,G.B

nals

Video

J

I

I

I

I

I

3.9 APL/Extended Character Set (ECS)
Card

The ECS card (sec Figure

define the color

by

information for each character position

display buffer. This shadow buffer (see Figure
6-19) can select characters from the APL ROS (or
several programmable fonts if the Programmed

(Location E2)

of

3-7)

characters

allows the user to

on

a character basis

providing a shadow buffer with a byte

CMD
DEC.

of

in

the

PTY

A

Decode

{lSI 0

Attrb

Font

Select

Parity
Check

Extended

Attribute

Symbols feature

characters

highlight the characters. The APL ROS
although it is standard with the
the 3279. The switches are set as
6-14. These return the correct response when the

control unit addresses a 'Read ID' command to the

ECS feature.

PS

L-_C_o_n_t_ro_ls_..J

is

installed).

to

appear

in

any

l-------....,r--'\..

It

can cause the

of

seven colors and can

is

ECS/

APL card in

shown in Figure

L-../

pluggable,

PS
Controls

To

PS

Logic Card

FBO

Redriven

To

PS

Logic Card

Select

Bits

To

PS

Logic

Card

RAM

Bits

Figure 3-7.

3279 MIM

Address

AOI

APL/ECS

Card

APL

AOll--------~~~

ROS

(E2)

FBI

Video

Serializer

PS

Address

To PS

Logic

Card

Chapter 3. Functional Components 3-11

3279

MIM

3.10

Programmed

(Feature) (Location F2)

The

PS

(Programmed Symbols) card (see . Figure

3-8)

allows the host,

to

program the shapes

the screen. Special character sets

characters may be programmed. Two fonts

B, PS2 feature) or six fonts

Select Bits
From

ECS

PS

Controls

From

ECS

PS

Address

From

ECS

FBO

Redriven

From

ECS

Symbols (PS)

or

the user through the host,

of

characters for display on

(A

Card

and

graphic

through F, PS2 and

(A

and

Address

Chapter 3. Functional Components 3-12

PS4 feature) may be installed. Each font is used in

the same manner as the APL

ECS. When PS2 only is included the jumper is

by
installed. This rearranges the addressing
second programmed font within the storage module,
see Figure 6-14,

ReadIWrite

----I

ROS, selection being

to

bring the

I

I

I

I

I

I

I

_J

Figure 3-8. Programmed Symbols Card

(F2)

(Also Green Data

Serializer

on

Ble)

Video Data

To

LCC

PS

Data

To

ECS

to

Base

Each PS font contains 190 programmable
characters. The user can program each pel in the 9
x 12 matrix of each character. The color of the
character

is

(see section 6.12).
For the triple fonts

program the color of each pel separately when the
ECS 'byte color field
of the color field bits, the color of the complete
character
other fonts. .

3.11 Selector Light Pen

This card contains the logic for the operation of the
selector light pen (see Figure 6-13).

3.12 Magnetic Reader Control

This card contains the logic for the operation of the
magnetic slot reader
scanner

defined by the base or ECS attribute

C, D, and F only, the user can

is

Ill.

For other combinations

is

defined by the ECS attribute, as for the

(LP)

(Feature) (Location G4)

Card (Feature) (Location G2)

(MHS) (see Figure 6-13).

(MSR) or magnetic hand

Card

(MRC)

3279 MIM

Chapter 3. Functional Components

3-13

Chapter 4. Removal

and

Replacement Procedures

4.1 General

It

is

recommended that the display be positioned

near

the corner of a table with the right-hand side

of

the bzzel nearest the corner, 1eaving sufficient

clearance for
the table in front of the display.

table is used, lock it

4.2 Logic Gale

To open the logic gate, insert

each of the two slots on the right-hand side of the

display and tUTn the wrench a quarter tUTn

slot. The rear enclosure assembly can then
swung open

the

bezel to be placed face down on

in

on

the hinges.

If

an

allen wrench

Logic Gate

a

the horizontal position.

tilt/rotate

in

be

in

each

4.3 Rear Cover

To

remove the rear cover, open the customer

panel by pressing up
three screws located along the hinged section

cover.

4.4 Bezel

1. Switch power

power

cable

2.

Remove the two

side

of

from

the enclosure assembly.

on

the two clips. Remove the

off

and remove the mainline

from

the

power

socket.

aBen

screws

the bezel and lift the bezel up and away

CRT

and

from the under

Coil

access

of

the

Control

Switches

Figure 4-1. General View - Bezel Removed

3279

MIM

Alarm

Volume

Potentiometer

Chapter

Brightness Potentiometer

and

Intensity

Override Switch

4. Removal

and

Replacement Procedures

4_1

3279

MIM

4.4.1

ON/OFF

1. Remove

2. Release the internal power cable from the clamp
near

the

3. Press to one side the plastic catch
the switch, and pull the switch out. Remove
the power supply (see section 4.5.2).

Unplug connector

4.

5. Reinstall in reverse sequence ..

Switch

the

bezel (see section 4.4).

ON/OFF

switch.

P2

from the prime power box.

at

the side

Chapter 4. Removal

of

and

Replacement Procedures

4-2

Figure 4-2.

4.4.2

I.

2. Pull

3. Remove the tape from around

4. Reinstall

5. Wrap two turns

ON/OFF

Switch

Brightness

Volume Controls

Remove the bezel (see section 4,4).

off

it. Release the mounting bracket from the

inside

of

insulate
and

socket together.

and

the two knobs.

the

bezel.

in

reverse sequence.

of

the

adhesive tape around

contacts

Audible Alarm

PII

(150

V)

and hold

and unplug

PII

the

plug

Figure 4-3. Brightness and Audible Alarm Volume

4.4.3

Three switches
removed as follows:

I.

2. Disconnect the wiring to the switch.

3. Pinch

4. Reinstall

to

Figure 4-4. Switches

Control Assembly

Normal/Test, Base Color,
Dualcase/Monocase Switches

on

the upper right of

Remove the bezel (see section 4.4).

the

spring clips together and push the

and

clip

out

switch
bezel.

in

through the front

reverse sequence.

the

and

bezel are

of

the

.

4.4.4

Indicator LEDs

Before removing the
power

and
the
contained

4"'.5

1. Remove

2. Disconnect P9

3.

4. Replacement is

Figure 4-5. Indicator

remove

power socket.

on

a PCB as shown in Figure 4-S.

Secllrity Keylock

the

analog card (see section

(use wrench. IBM
Withdraw

ensure

way up so
hitting

and

the

keylock assembly.

that

the

that

the

side of the display unit.

4.S Power Units

DANGER
IkfolY

/lily

po_

"nit

tM

Fllse

from

tM

display

Ctlble

off

po_

aad

perftmned,
mainliM powe,

socUf.

4.5.1

DANGER

Switdt powe,

Ctlble

f--

LED

assembly. switch

the

mainline power cable from

The

indicator LEDs are

remove

the

Part

the

reverse

keylock is inserted

the

key

LED

repl_"t

mil$(

discolrneded

IYmaVf!

SOCUf

retaining

4418787).

of

removal.

be

turned

procedures are

at

the powe,

1M

mai"liM powe,

the

off

can

Assembly

be powered

before c""ng;ng

off

4.SA).
nut

but

correct

without

aad

tM

tM

The

main supply fuse is located in the front

enclosure assembly below the bezel. Push

and

turn

cover
fuse.

4.5.2

The

CRT

power

it counterclockwise

Power SlIpply

supply is located

as viewed from behind.

to

the right of the

to

release

the

the

fuse

DANGER
Compt>lfl!nls

the

""ned

1. Switch power off

2. Remove the rear cover (see section

3. Unplug the

4. Remove the retaining clip

S.

6. Remove the two screws

7. Reinstall in reverse sequence, ensuring

8. See

4.5.3

1.

2. Remove the power supply as described in

3. Remove connectors

4. Disconnect the ground wires from the assembly.

5. Remove

6.

7. Reinstall in reverse sequence.

DANGER

EIWI,."

powe, assembly are

on t"is

Ctlrd

are

""t.

card, allow ;t to cool

for

5 minutes with

Before ""adUng

off.

and

power cable from the power socket.

A2

to

the

inside

Pull the flat cable through the gap (it
the connector shroud is removed).

supply card.

card

is

correctly located in the bottom guide

both

top

guides.

Chapter

Prime Power

Switch power off
power cable from the power socket.

section 4.5.2.

power

box assembly.

the

to

the base of the enclosure.

Remove

the

tIrot

all grouad conned/om

remove the mainline

cable connector.

that

of

the

logic gate.

S for adjustments.

and

P1

two

screws

assembly from the display.

tw:rJnnected;·

holds the cable

and

pul) out the poweT

Box

remove the mainline

and

P2 from the prime

that

secure the assembly

to,

the prime

4.3).

is

powr

easier if

that

the

and

3279

MIM

Chapter

'4. Removal

and

Replacement Procedures

4-3

3279

MIM

4.5.4

Analog

The

analog card is located
when viewed from behind.
I.

Switch power
power cord from the power outlet.

2. Disconnect the two ground wires from the

ground screw
assembly.

3. Remove

of the analog card assembly and the

clamp.

4. Withdraw the assembly toward the rear

machine taking care

connected

5. Unplug P5, P6, P7.
from the analog card.

6. Unscrew the clamp

wire
connector, P21. Pull out the wire

to

it

7.

Remove the analog card.

8.

To

reinstall. first check

the CRT.

Note: There are alternative positions

CRT

analog card, see Figure

a.

If

Matsushita Electronics Corporation (see label
on

card).

b. If the tube is manufactured by the

Mitsubishi Electric Corporation (see label on
the bell of the
card).

9. Insert the

socket. P21 and screw down the cable clamp.

10. Continue installation in reverse sequence.
Ensure
top

It.

Reconnect 2 ground wires

DANGER
Verify that

sec"rely.

tkt;'i/s.

12. See

Card

to

the left

off

and

remove the mainline

at

the

bottom

the

two

screws

at

the

not

to

to

the

at

the Line

Output

the frame.

jumper

depending

the tube

is

the bell

of

install the

install the jumper in position H.
EHT

cable

that

the card is correctly located in the

and

bottom guides.

1111

ground

Reier

to

Chapter

5 for adjustments.

damage the cables

card.

and

P26 (see Figure

that

holds the red
Transformer

that

on

the level

4·7.

manufactured by the

the

CRT

behind the analog

jumper

CRT

behind the analog

fully

into the

wires

liN!

Figllre

6-6

of

the

of

the card

top

and

bottom

center

of

EHT

(LOPT)

and

discharge

the jumper matches

for

of

the

in position

and

screw down.

ream_ted

lor

grounding

L.

LOPT

CRT

4-7)

the

the

Chapter

4. Removal

and

Replacement Procedures

4.6 Logic Cards

4.6.1

Removal

Switch power off. Remove
connectors.
shown
the

4.6.2

Push
operate the levers as shown
the

CAUTION
Always use a card shroud when reinstalUng a card,

prevent

For
6-14

jumper positions.

Note:

video output card instead
location C2. The video output card has
modules. When
C2, the resistance between each
and

Operate

by

the

card.

top

arrows

Replacement

the

card

firmly into its socket

card connectors, see Figure 1-6.

contact

with

ECS

and

PS feature cards (E2.

for details

32

ground falls to less than 10 kilohms.

of

79s with the Video Output Facility have a

this card is installed in location

any

the levers

in

in

Figure 4-6

in

adjacent

cards.

switch settings

of

a line control card in

attached

the directions

and

and

Figure 4-6. Replace

F2)

and

video

4-4

top

card

withdraw

then

see Figure

module

and

two extra

output socket

to

Removal

4.7

Connectors

Most internal connectors have mechanical locking
devices.

4.7.1 M"'ti-Pin Connections

Removal - Pinch the latch tabs together and pull
the connector free from the pins.

Replacement
the tabs are latched.

4.7.2 Internal Coaxial Connection

Removal - Press and hold the latch button and pull
the connector free.

Replacement - Reseat the connector ensuring that
is

latched (see Figure 6-13 for location).

- Reseat the connector ensuring that

it

Figure 4-6. Logic

3279

MIM

Card

Removal and Replacement

Chapter 4. Removal and Replacement Procedures 4-5

3279 MIM

Chapter 4. Removal and Replacement Procedures

4-6

DANGER

Dangerous voltages

exist at all these
connectors

P26

(6kV)

P21

(EHT)

View

Hole

for

CRT

fiJamentq
jumper

Alternative

CRT

filament

jumper location

: ] L

.J H

Jumper Position

CRT

Manufacture -

behind analog card.

CRT

filament

Filament configuration

Filament resistance (Cold)

current

See

label on bell

Symbol

Note: When exchanging a

CRT

or

Analog Card, match

the

jumper

position to

the CRT. This sets the

.-.--~--

I+----'~-

P6

P5

(280 - 450

filament voltage

6.3 Vdc.

Incorrect setting

reduce

dip/ay brightness .

V)

CR

T life

to

may

or

the

-P4

P7

CRT

filam~ent

location

L

of

CRT

Matsushita

Electronics Mitsubishi Electric Corporation

Corporation

Low (715 rnA)

Three

in

parallel

1.911

jumper

on

some

cards

High (800 rnA)

Three

in

series

1.411

H

Figure 4-7. Analog

Card

4.8

Video Components

4.8.1

Amplifier

DANGER

C_ts

tIw t:tud,

1111019

""".j

off·

1.

Switch power off
power cable from the power socket.

2. Remove
PI7A,
card

(see Figure

3. Remove

and remove the cover.

4. Pull

the

S.

Reinstall

The multi-wire connectors cannot be mixed up

because they are different sizes.
tighten the safety

these connectors have been reconnected.

6. See

Chapter

4.8.2

Video Card

\.

Switch power off
power cable from the power socket.

2. Remove the analog card (see section 4.5.4, steps

I through 4 only).

3.

Unplug P5
Figure 4-7).

4.

Disconnect the
video card.
routing

5. Pull

the

6. Disconnect

card (see Figure

7. Reinstall

Chapter

8. See

4.8.1

CRT

DANGER W

TIIbe

SIIfely' lit tile fl'f1llt

Itmtdlbtg

CRT

Cllrd

011

tIdr t:tud

illY

/Jot.

it

to toOl

and

the

four push-in multi-wire connectors

P17B,

P18

and

6-10).

the

screws

amplifier card off its four locating

the

amplifier card

cov~r

5 for adjustments.

and

and

P26

three

Note

of

the connection points

the wires (see Figure 6-9).

video

card

P14,

PI5

1-4).

in

reverse sequence.

5 for adjustments.

lind

Coil

...

r SIIfely eqllipment

..

Befon

for 5 minll""

remove

the

mainline

P19

from the amplifier

that

secure the safety cover

in

reverse sequence.

Do

securing screws until

remove the mainline

from the analog

ground wires from

off

the

CRT

base.

and

Pl6

from the video

AS1embly

(_

tltis

m_l)

'Clltltotk

of

witlt power

not

IwIlItIlbtg

finally

card

(see

the
and

wilen

lUgs.

RII)I

4.8.3.1 Removal

CAUTION

tbe logic gate

Support
falling backward wben tbe

removed.

\.

Remove the mainline power cable from the
power socket.

2.

Position

the

with logic gate open.

3. Remove

4. Remove:

5.

6.

7. Disconnect

8. Disconnect the ground braid clamp

9. Remove

10.

the

down

face
internal power cable from the rubber clamp

the

ON/OFF

•

The

power supply (see section 4.5.2)

The

analog card (see section 4.5.4)

•

The

amplifier card (see section

The

EHT

but

do

the bracket)

Pull the video
place it

on

Loosen

the

assembly from

see Figure 1-2).

jumper link (Figure
can

move forward freely.

CAUTION
The

following

mounting. The

kg;

support
pressure
Handle the
neck.

the

from

Check

to

prevent tbe display from

CRT

aDd

coil assembly is

display as described in section

bezel (see section

in

front of the display. Release

switch.

bleed assembly (see section 4.8.4,

not

remove the bleed assembly from

card

from

the table.
clamp

and

the

CRT

P27

(front

6-9).

steps

free

CRT

it

aDd

protect

tbat

could damage It or

CRT

by the bell only,

the

four hexagonal nuts

comers

of

the

that

the

logic gate is supported.

4.4)

the

CRT

pull

the

convergence coil

neck.

left of the

Ensure

the

CRT

weighs approximately 7.5

it

from excessive

other

CRT

face.

and

4.8.1)

base

CRT

and

that

from its

NOT

and

washers

4.1,

place it

the
near

and

screen -

its

the braid

units.

by

the

3279

MIM

Chapter

4. Removal

and

Replacement Procedures

4-7

3279 MIM

II.

Observing normal

"CRT

Safety"

move the

face down on the bezel.

12. Remove the wrap tie that secures
coil.

13. Remove the degauss coil, ground braid and
securing clips from the CRT.

Prepare a surface for the

14.
CRT

to that surface.

4.8.3.2 Replacement

I.

Ensure

that

is

the correct way up.

2. Remove the new
on

the

bezel with the

front.

3.

If you do not have a new piece of plastic foam
(acoustic shield) to fit around the deflection
coils, transfer the plastic foam from the old
CRT.

Pack the old

4.
neW

CRT.

5. Install the degauss coil, ground braid and
securing clips on the new CRT. Keep the
ground braid between the tube and the degauss

coil.

6. Secure the degauss coil

wrap.

7. Observing normal
install the CRT in the display unit, taking care
to avoid trapping or fouling any cables.

8. Insert the washers and nuts but do not tighten

the nuts.

9. Check that all cables and connectors within the

display unit

10.

Connect the degauss coil (P27).

11.

Center

the

nuts.

12. Check that the
the bezel and repeat

13. Remove the pin protector from the

insert it on the failed CRT.

CRT

safety precautions (see

the front

of

from the display unit

this manual),

CRT

and move

CRT

at

the case that contains the new

CRT

from its case and set it

EHT

connector to the

CRT

in the case provided with the

in

position with the

CRT

safety precautions,

are

free and accessible,

CRT

in the display and tighten the

CRT

is

centered by replacing

Step

,11

as necessary.

and

the

degauss

CRT

put

the

CRT

and

Chapler 4. Removal

14. Slide

it

CRT

interelectrode gap as shown
Adjust
tolerance. Use the machine base as a reference.

Note:

convergence

15. Secure
clamp but do

Note:

there will be

to

the rear. there will

16. Check
matches the

17. Reconnect the ground braid clamp (see Figure

6-9)

and

Replacement Procedures

the

convergence coil assembly

neck and position the assembly over

the

angular alignment to

If

the angular alignment

pattem will

the

convergence coil assembly by

not

If

the coil assembly is

too

that

the

CRT

and

replace

be

distorted.

over-tighten

little sensitivity,

be

too much sensitivity.

jumper

on

type (see Figure

the

jumper link,

18. Install:

EHT

bleed assembly (see section

The

4.8.4.2. steps 2 through
The amplifier card (see section
The video card (see section 4.8.2)

• The analog card (see section 4.5.4)

•

The

power supply (see section 4.5.2)

that

19. Reconnect ail plugs

during the removal procedure.

20. Ensure that all ground connections
reconnected securely. including the two

analog card heatsink.

that

21. Check

correctly seated.

22. Replace
power cable near the

Secure the bezel to the front

23.
unit (see section 4.4).

24. Carry

Chapter

On

25,

setting up procedures, replace all the safety

covers

all cards and connectors are

the

rubber clamp

out

Display Setup as detailed in

5.

completion of the initial checks and the

and

close the logic gate.

were disconnected

ON/OFF

in

Figure 4-8.

the

is

the

too

the

analog card

4)

on

the internal

switch.

of

onto

the

stated

incorrect, the

screw.

far forward

if

it is

too

4-7).

4.8.1)

are

on

the display

4-8

the

the

far

the

CRT

Neck with Convergence

Assembly

Deflection Coils Deflection Coils

Coil

Centers

2mm

within
of

center line

CRT

Neck

I nterelectrode

gap

Alignment

Angular

Tolerance ± 5°

:=:

~

Figure 4-8.

4.8.4

4.8.4.1 Removal

1.

2. Remove the power supply card (section

3. Loosen the two screws holding the bleed

4.

Convergence/Purity

EHT

Bleed

Assembly

Switch power off
power cable from

analog card (section
(section

DANGER
Do not let

assembly/amplifier card bracket in the top of
the box,

DANGER

TIle

CRT

EHT

lead "...

be discharged to g,..,.,nd

befon

lead

is

ncolllll!CleJ.

COIUINIed

tile

CRT

Supporting the bleed assembly, unplug
cable from
cap

at

the

cap

finnly, rock it

and
the

4.8.1)

onytlling

and

remove the assembly.

retaim a capacitive charge after tile

bun

discolllll!Cled

tile

CRT

EllfNn that tile discharge lead

to gl'Ollnd

colllll!ClOl'.

the

top

of

edge

to

break

to

Coil Assembly

remove the mainline
power socket.

4.5.4),

and

amplifier card

fall

on

tile tube neck.

(step 4).

witll

a suitably i,.,talled

is

handled

or

tile

BEFORE

tONClling

the CRT. Lift the rubber

the

airlock, grasp the

one

side, and lift.

3279 MIM

4.5.2),

It

EHT

it

onto

the

must

lead

is

EBT

5. Disconnect the ground connector
power box (see Figure 6-5).

6. Withdraw the bleed assembly/bracket, remove

two

securing screws, and take the bleed

assembly from the bracket.

4.8.4.2

Replacemeot

1.

Mount

the bleed assembly

assembly/amplifier card bracket

the

two screws removed in step 6

using
section 4.8.4.1.

Connect

2.

3.

4.

5. Reinstall the analog card (see section

6. Reinstall the power supply card

7. Ensure

Chapter

the bleed assembly ground cable

prime power box.

Connect

the

EHT

Attach

the bracket

the

two screws loosened in step 3 of section

4.8.4.1.

CAUllON

Verify tbat all grouod
secorely.
details.

4. Removal

Refer

amplifier card

that

to

and

all ground connections

and

on

the bleed

cable

to

the CRT.

to

the display

..

ires

are

Figure

make all connections.

Replacement Procedures

recoooected

6-5

for grouoding

at

and

and

and

the prime

secure it

of

tighten

4.5.4).

the

are

replaced.

to

the

4-9

3279

MIM

4.8.5

Degauss

To

remove

section 4.8.3 "CRT and Coil Assembly". For

removal, follow 'Removal' steps 1 through 13.
replacement, follow 'Replacement', steps 5 through
23 omitting step 13.

Display adjustments should not be affected,

refer

to

and

covers

4.9 Logic

4.9.1 Removal

1.

Switch power off

from the power socket.

2. Remove the rear cover (see section

3.

Disconnect

locations.

Coil

and

replace the degauss coil, go

Chapter

5 if necessary. Reinstall all safety

close the logic gate.

BOl!rd

Planar Strips

and

remove the mainline cable

all

connectors

and

to

but

4.3)

note their

4. Remove the logic cards.

5. Remove the two diagonally opposite screws
right

and

bottom left)

planar

strip holder

6. Remove the

4.9.2

Replacement

1.

Feed the cables
the

gap at the right-hand side of the logic gate

(as viewed from the rear),

shrouds are removed; replace them afterwards.

2. Ensure

3. Insert the planar strips

4.

5. Close the logic gate so

6.

that
strip holders are positioned the correct way
round (see Figure

approximately their correct positions. Insert, but

do

not

tighten, the strip-securing screws.

Plug all

the

them in position.

positions it at the correct height,
the

strip-securing screws.

Open

the

logic gate. Reinstall all connectors

(pass

the

keyboard cable through the

right

-hand

rear).

side

the

that

attach

logic gate.

and

planar strips.

It

is

each rear

easier if the

to

the

rear

holders

that

plug into the strips through

the card-locating shoulders

4-9).

and

rear

holders in

logic cards into the gate

that

the enclosure

then

of

the logic

gate

as viewed from

on

and

tighten

gap

the

clip

at

For

(top

Chapter

4. Removal

Shoulders

Note: Shoulders should be to the

for

both

up
from the appropriate

Figure

4-9.

the

and

Replacement Procedures

card

side

and

pin

side.

Planar

Strip Holders

left

and

side

of

holders when viewed

4-10

arrows pointing

4.10 Audible Alann

1. Switch power

power cable from

2.

Remove.

4.5.4.

3. Remove

alarm assembly
Fi8ure 4-10).

Note

4..
the audible alarm assembly by push-in

connectors (see Figure

5.

Lift
connectors and withdraw
display.

6. Reinstall the audible alarm assembly

reverse sequence.

Figure 4-10. Audible Alann Assembly.

off

and

remove

the

power socket.

the

analog card as detailed

the

two screws

the

position

the

audible alarm assembly, remove

To

Alarm Potentiometer

'------+-r-SCrews

that

the

base

five

4-10).

the

secure

of

wires

alarm f

to

the

of

the

the

mainline

in

section

the

audible

enclosure

connected

the

... m the

in

the

4.11 Keyboard Units

4.11.1 Keyboard From Display Statioll

1.

Tum

power off.

2. Open the customer access panel
the display.

3. Remove the wing nut
cable to the frame.

the

4. Free

5. ReinstaU in

6. Ensure that

cable clamp, and remove the keyboard

cable connector from its socket.

the

reverse sequence.

aU

seated in the sockets and that the ground straps

are

attached.

cable connectors ·are ·tightly

at

that

holds the keyboard

the rear

of

4.11.2

Keyboard

I.

Invert

the

2. Remove
keyboard base.

3.

Place the keyboard base

(see

five

4. Lift the top cover

5. Reinstall

to

NOle: Check for cover clearance around the keys

cover has been reinstal/ed. Adjust

after the

required.

4.11.1

Keyboard Assembly

1.

Disconnect the keyboard from the display

station (see section 4.11.1).

2. Remove the keyboard top cover

4.11.2).

3. Disconnect the keyboard cable connector and
clicker connector

4. Remove the two screws
assembly to the base (mark for alignment
reference).

5. Handle

6. Reinstall in the reverse sequence.

7. Ensure

4.11.4

1. Disconnect the keyboard from the display

2. Remove the keyboard top cover (see section

3. Disconnect the· clicker_connector.

4. Remove the clicker assembly by sliding the bail

S.

4.11.5

Keybuttons are removed by sliding the key top puUer
over

the

lift

it

off

keys.

that

Clicker A.ssembly

station (see section 4.

4.11.2).

fastener from under the cast tabs.
Reinstall in

Keybllttoll

the

key top

Top

keyboard.

the

four screws

in

the

keyboard assembly by

the base, taking care not to press any

the cable connector is tightly seated.

the

and

Coper

in

on

off

the keyboard.

reverse sequence.

at

the logic card.

that

II.

I).

reverse sequence.

pulling straight up.

the

comers

of

a flat surface.

if

From

Base

(see

section

hold the keyboard

the

sides and

the

3279

MIM

Chapter 4. Removal

and

Replacement Procedures 4-11

3279 MIM

4.11.6

Key

Modules

WamiDg: The work area must be clean during work
on the keyboard.
module f1yplate
problem.

4.11.6.1 Removal

see

Note:

to

be

exchanged.

1.

Disconnect the keyboard from the display

.

station (see section 4.11.1).

2.

Remove the keyboard top cover (see section

4.11.2).

3. Remove the keybutton from the module to be
exchanged (see section 4.11.5).

4.

Remove the keyboard assembly from the base
(see section 4.11.3).

Invert the keyboard assembly, and place it on

5.
the base using the locating pins on the left and
right sides.

6. Remove the screws that hold the bottom cover
and circuit

7. Lift the circuit board and bottom cover from
the keyboard assembly, and place them in a

clean area. The

is

known as the all-keys assembly.

Note: Exchange the

comes
module. Repaired modules can cause

intermittent failures.

8. Handle the all-keys assembly
take care not to press any keys. Turn it the
correct way up onto the base, locating it on the

pins

9. Press down on the key module until it is
relegsed from the holding plate.

10. Handle the all-keys assembly by the sides and
take care not to press any keys. Invert it
the base, locating it

I I . Remove the module.

Any

particle between the key

aod the prioted circuit is a potential

section

4.11.7

if

the spacebar module is

board to the keyboard assembly.

part

that remains on the base

key

module

off

Do

not attempt

on

to

the pins

if

repair the

by

the sides and

a flyplate

onto

Chapter 4. Removal and Replacement Procedures 4-12

4.11.6.2 Repiacement

I.

Ensure that the alignment tab and the angled
keystem are in the same position as those
other modules in the

2.

Install the new module by pressing the key
module into the holding pIate

3. Clean the printed circuit board by carefully

wiping it with a lint-free cloth moistened with
isopropyl alcohol. Inspect every key module
fly-plate for any foreign matter, and carefully

if

needed .

clean

4. Align the holding screw holes through the

bottom cover, circuit

insulator (if used). Lower the circuit board and
bottom cover onto the all-keys assembly.
Secuse the circuit board· to the all-keys assembly
with the holding screws.

5.

Reinstall the keyboard assembly on the base,
maintaining its original alignment.

6.

Reinstall the keybutton in the correct location.
If you have removed the spacebar, see section

4.11.7.2.

7. Reinstall the keyboard cable connector and
clicker cable to the logic card.
keyboard top cover, and reconnect the keyboard
to the display if it was removed.

8.

Use Test Mode 2 to check for correct operation
of

the keyboard.

all-keys assembly.

by

board,

insulator, and top

Reinstall the

hand.

of

the

4.11.7

Spacebar

4.11.7.1

Removal

Perform the removals described in sections 4.11.1

and 4.11.2 for access to the keyboard assembly.

\.

Hold the spacebar
modules), and remove by pulling upward evenly.

2. Pivots can be removed (if necessary) by pushing

with a screwdriver in the slot in the side of the
pivot.

To

remove the module

4.11.7.2 Replacement

1. Press any pivots removed in step 2 (above) into

the base.

2. Place the spacebar
into position while engaging
pivots.

3. Press down on the spacebar
modules to seat it.

4. Check the spacebar operation for binds.
binds, the probable cause
stem. This stem can be shaped to free the
bind.

s.

Install the keyboard top cover, and reconnect
the keyboard
previously removed.

at

each

end

see

section

on

its modules, and lower it

is

to

the

display station

(beyond the

4.1\.6.

the

bar in the two

at

the spacebar

If

if

it

it was

a bent right module

Logic Card Assembly

1. Remove the keyboard top cover (see section

4.11.2).

2.

Disconnect the keyboard cable connector and

clicker connector

3.

Remove the two holding screws from each
of the logic card.

4. Remove the logic card.

S.

Reinstall in the reverse sequence.

Note:

Check that the keyboard I D jumpers

new logic card are

old logic card. See Figure

at

the logic card.

in

the same position as

6·

J J

if

necessary.

on

on

end

the

the

3279

MJM

Chapter 4. Removal and Replacement Procedures 4-13

Chapter S. Display Adjustments

The

complete adjustment procedure shown

detailed

in

this

chapter

display from a totally unadjusted condition.

If

only

one
<;olor
section 5.3 for
any

convergence. :

marginal range, readjust
Also,

to
necessary adjustments

1. Power Supply Card: Perform the initial checks

2. Analog Card: Perform the initial checks (section

3.

4. Amplifier Card: Perform the initial checks

5.

6.

7. Convergence/Purity Coil Assembly: Perform

control

balance, go directly

of

the

seven raster controls may disturb

after

a single

go through the complete procedure.

(section 5.1),
(section

5.3.1)

adjustments.

5.1),

then

and

work

Color Balance (sections 5.2.1, 5.3.6,

the

unless

Logic Card B2: Perform the initial checks

(section 5.1),

5.3.1)

(section

5.3.3)

(section

(section 5.1).
marked

GAIN

preset during manufacture. Go

adjustments (section

red

brightness, color balance, purity, static

convergence, and dynamic convergence only.

Video Card: Perform the initial checks (section

5.1),

then

color balance (section 5.3.6 and 5.3.7).

CRT:

Perform all the adjustments starting

section 5.

1.

initial checks (section

adjustments (section 5.2)
purity, static

convergence only.

is sufficient

needs

adjustment, for example

to

that

If

the

then

go

to

forward. Ignore

display

then

the procedure

control. Adjustment of purity or

dynamic

convergence has a

the

static convergence.

FRU

change, there is

are

listed below.

go

to

static convergence

and

work forward

coarse adjustments (section

and
only.

Do
on

Red

is

too dim or

adjust static convergence

dynamic convergence

not

adjust the four controls

early level cards; these are

5.2)

and

if necessary, adjust red brightness

5.1),

then go

convergen~e,

and

and dynamic

to

set up a

to

Brightness

too

bright.

to

coarse

carryon

to

carry

on

and

in

no

need

The

make minor

5.2)

and

and

5.3.7)

to

adjust

at

the

coarse

to

adjust

and

8.

Planar Strips: Perform the initial checks

5.1),

then

(section
(section 5.3.3).

Warning:

Use adjusting tool, IBM

adjust potentiometers; screwdriver blades
them.

(Section

5.11

(Section 5.2)

(Section 5.3.1)

(Section

5.3.2)

(Section 5.3.3)

(Section 5.3.4)

(Section 5.3.5)

(Section 5.3.6)

(Section 5.3.7)

(Section 5.3.8)

check dynamic convergence

Part

ADJUSTMENT PROCEDURE

Initial Checks

Figure 5-1. Adjustment Procedure

1864853,

will

damage

to

3279

MIM

Chapter

5. Display Adjustments 5-1

3279

MIM

5.1 Initial Checks

I.

Make ready the control unit (see" control unit
problem determination guide).

2. Plug the mainline power cable into the

customer's outlet.

3.

Switch power
(Power Good) is on.

Check

4.
after
Note:

the Display Ready indicator is on.

CAUTION
Use insulated probes, IBM

similar, during

5. Measure the voltages in the following table

ensure they
you
Use the potentiometer mounting plate
bezel as a ground.

ANALOG

CARD

PIN

20
43

31

48

37
5
30
36

POWER
SUPPLY

PIN

(P3)

1
3
2
5
4

*

-150V

on

and

verify

that

indicator 1

that

indicator 2 (Display Ready) turns

approximately

The screen will probably brighten when

are

unable to

(P4)

CARD

through

45

seconds.

the

next

step.

are

correct.

obtain

TOLERANCE

VOLTS

(V

(de)

-135V*

-150
+12 ±1.5
+70 +10.
+5.0

-5.0

0

+8.5 ±0.9

TOLERANCE

VOLTS

(V

(de)

+12.0

-12.0

0

+103

0

39kfl

Part

1749249

Go

to

MAP

the correct voltages.

de)

±20
±20

-5
±0.5
±0.5

.....

de)

±1.0 0.4

±1.0

.....

±8 3.0

.....

0200

on

RIPPLE
(Vpk·-pk)

0.25

0.25

0.3

RIPPLE

(V

Q.4

.....

Figure 5-2. Voltage Table

or

and
if

the

pk-pk)

.....

6.

Turn

the
counterclockwise until
switch operates

(The

raster
purity/color
the potentiometer

7.

Set

the

on

screen

Notes:

J.

The Control Key is used extensively by
MODE

to the keyboard overlay in Figure 2-3 where the

key is shown labelled

keyboards this will be the

2.

During the set-up procedure.

)C

c-f

Dress

the

If

any

action does

repeat

the

section.
If the results are still

failure; go

5.2

Coarse

Start

here
replacing the CRT. See Page
adjustments
exchanges.

Note

that
give a display

subsequent

for

If

any

step fails, go

Try

to

adjust

MAX

potentiomenter (except

amplifier

card

Ready

the

1.

Switch power
Turn

the operator's brightness control fully

2.

clockwise.

3.

Wait

45

Chapter

5. Display Adjustments

BRIGHTNESS potentiometer

will probably

Normal/Test

of

characters

3 but is not labelled

appears in the operator information area,

RESET

action

to

MAP 0000,

Adjustments

to

completely

that

these coarse adjustments

that

fine adjustments (see section

the display without altering

change).

display unit as follows:

the

- a white raster may appear.

brightness imbalances.)

Intensity Override

be

to

its mid-point.

switch

may

appear.

tinted

due

to

Test. A full

CONTROL.

CONTROL. On most

RESET

key.

If)(

key

and retry the action.

not

produce the expected results.

and

then

try

repeating the whole

not

as expected you have a

Entry

Point A.

set

up

the

display

5-1

for

are

required

is

an

acceptable starting point

to

MAP

after

0000,

other

are

Entry

the

after a CRT

on

.

to

Now

TEST

-f

or

after

FRU

intended

5.3).

Point
the

or

set

Refer

A.

RED

seconds until Indicator 2 turns on.

5-2

to

5.2.1

Coarse Color Balance

Note: See Figure 1-4 for locations

I.

Set the

Normal/Test

2.

If

the display
primary colors are approximately balanced (look
at

the cursor). then go

5.2.1.1 Greco Guo

I.

Set the

Normal/Test

to

Test.

back

2.

If the screen is completely blank. set the
HEIGHT

control fully counterclockwise.

If the screen

3.
GREEN

turn
MIN) clockwise until a reasonably bright image
appears.

The
static convergence or purity controls
out

of

adjustment.

4.

If

the

HEIGHT

adjust it to give a normal display height.

5.2.1.2

Blue Guo

1. Set the

2. Press the following keys:

3.

5.2.1.3

1.

2. Press the following keys:

3. It is

Normal/Test

back to Test.

(alphabetic)

If

the

screen

MAX

(and.

until a reasonably bright image appears.

Red Guo

Set

the

Normal/Test

back

to

Test.

(alphabetic)

better
potentiometer if you can continue the
adjustments
however, the screen is blank

the current position

potentiometer.

necessary.
reasonably bright image appears. If
acceptable image
RED
position

RED

MAX potentiometer back to its marked

and

switch to Normal.

is

reasonably bright

switch

is

either still blank or

MAX

(and.

image will be green unless the

control was altered in Step

switch

is

blank

if necessary.

switch to Normal

not

to

move the

at

the

existing brightness level. If,

of

Tum

RED

MfN) clockwise until a

cannot

go

to

MAP

to

section 5.2.2.

to

if necessary.

to

CONTROL

or

very dim. turn

BLUE

CONTROL

RED

or

the

RED

MAX

be obtained.

0000,

of

controls.

and

Normal then

is

are

Normal. then

MIN) clockwise

MAX

very dim, mark

MAX

(and. if

an

set

Entry

Point A.

the three

very dim.

GREEN

badly

2.

0 Q

BLUE

then

0

the

5.2.2

Coarse Raster A.djustment

I.

Set

the

Normal/Test

Lo

Test

to

display

2. If the four edges of the pallern are within 3
35

mm

(0.1 to 1.4 inches)
screen. then
adjust the WIDTH

(H

CENT)

of

the pallern are within 3 to 35

edges
to

1.4 inches)

3. Adjust the top margin

potentiometer

35

mm

(0.1 to 1.4 inches) of the top of the

screen.

4.

Adjust the
necessary the
pattern

is
inches)
Note:

5.2.3

1. Set the

to

2. See Figure 1-4. Adjust the static focus finger

control
center.

5.2.4

At

this point the raster may still be badly adjusted
and
The

uniform.

Note

color display must be available for the following

procedures.

1.

Display the convergence
a.

b. Hold down the

c. Press the following keys: / 7

2.

If

each

within 3 to 35

of

the bottom of the screen.

The picture will blank

control is set

Coarse Focus

Normal/Test

Test.

(FOCUS

Coarse

any

characters

color

of

the screen may still not be correct or

that

a control unit that can support the 3279

Set

Normal/Test

then release

the patterns

other. go

switch to Normal

the

test

pattern.

go

to

potentiometers until the vertical

of

until the

HEIGHT

SKIP potentiometer) until the

too

1)

Static

on

both

are
to

of

sectlon 5.2.3. Otherwise.

and

horizontal centering

the sides of the screen.

(TOP

lOP

line

potentiometer

mm

low.

switch

to

for best focus

Convergence

the screen may be distorted.

pattern

switch

to

AL

T key

keys.

within 5 mm

section 5.2.5.

and

the sides of the

MAR)

is

within 3

(and

(0.1 to 1.4

If

the Height

Normal

and

at

screen

as follows:

Normal

and

press TEST

ENTER

(0.2

inches) of

mm

if

back

to

(0.1

to

back

3279

MIM

Chapter

5. Display Adjustments 5-3

3279

MIM

3. If necessary, adjust the red
G)

'STATIC

1-4) until the two patterns align vertically

horizontally.

4. Press the following key: R

5.

Adjust the blue
controls until the two patterns align horizontally
and
Note:

potentiometer

6. Press the following key: R

If the
step 2.

5.2.5

I. Set the

to

Test.

2. Press the following keys
red characters:

CONTROL

If necessary, adjust the two

3.
'PURITY'
the characters appear

CONY

and

vertically.

The static blue lateral control is a

OD the amplifier

two

patterns have moved apart. return to

Coarse Color Purity

Normal/Test

0 I (alphabetic)

potentiometers (see Figure

and

CONTROLS'

blue lateral (B and BL)

green

(see Figure

card.

switch

to

Normal

to

fill the screen with

(H

and

V)

RED

over

all the screen.

5.3 Fine Adjustments

Note: Do not attempt any fine adjustments

32

79

has been powered

(see

section 2,6.

5.1.1

Static

This procedure will result
correctly converged

1.

The

display must

that

can

support the

(b)

removes the power supply
convergence store.
a parity error
written

to

a.

Switch power off.
Connect

b.

(short circuit).
c. Remove the jumper

d. Switch

e.

Set

Normal/Test

error

code

screen. Press

on

I).

Convergence

the

a jumper from B2B08

power

for

in

the

at

the

CENTER

be

connected

3279

color display, Step

The

and

control unit will

the default values will

store.

after

on

and

wait

switch

'228'

or

'55'

may appear

RESET

and

at least

20

three colors being

of

the

to

a control unit

to

the

to

5 seconds.

45

seconds.

to

Normal.

ignore it.

(R

and

and

1-4)

unlil

minutes

screen.

detect
be

B2D08

An

on

and

back

until

the

the

Chapter

5. Display Adjustments

f.

Hold down
then

g. Press the following keys: / 7

The

pattern

center.
The

pattern

2.
if misconverged).

3. Adjust red
CONY

align horizontally

1-4).

4. Press the following key: R
The

pattern

misconverged).

5.

Adjust

until the patterns align vertically.

6. Adjust blue lateral
CONTROL'
align horizontally.

Go

back

7.

8. Press the following key: R

9.

If

the patterns diverge, return to Step 3

work forward again.

10. Hold down
release

5.1.2

Purity

1.

Jumper
Video

CAUTION
This jumper must
30

seconds

may distort. Remove and replace
Set

the

2.
to

Test. Press

CONTROL

'ALT'

release both keys.

and

CONTROLS'

blue (B)

to

both

D2Y02

se,e

Figure

at

Normal/Test

key

'-

I - I

-'

appears

displays in yellow (or green

green

(R

until the two patterns

and

verhcally (see Figure

displays in pink (or red

'STATIC

'STATIC

(see Figure

step 5 if necessary.

'ALT'

key

keys.

The

screen clears.

to

D2Y08. (Force Reverse

1-6.)

Dot

be left

a time, otherwise the shadow mask

switch

the

following keys:

0 I (alphabetic)

and

and

CONY

1-4)

and

press

ENTER

at

the screen

G)

'STATIC

CONTROL'

CONY

until the

press

'TEST',

00

for more thaD

at

to

Normal

'TEST',

and

and

blue if

patterns

and

each step.

and

5-4

red

then

then

3. Unless

4.

5.

6.

7.

8. Remove jumper

5.3.3

This procedure converges the screen. The
convergence pattern is stepped through 13
and
Note:

)C

another operator
routine. Wait a few minutes before trying again.
[f
effect occurs
[f
operator information area at any other time.
press the

1.

the

raster is uniformly red, adjust

and

vertical

(H

and

V)

horizontal
potentiometers (see Figure
area

covers the screen. Pay close

the four corners.

Note: That as the color becomes pure

becomes brighter and the adjustment should thus

~

made to leave the color both as pure and as

bright as possible.

Set

the

Normal/Test

to

Test.

Check

green.
Press the following keys:

(alphabetic)
Check

that

If

the green

readjust

the

If

any

readjustment was necessary. return

step

1.

If

the

second time through the seq uenee, go to!

MAP

0000,

Dynamic Convergence (Online

Test

7)

each

is

converged in turn.

[f, after executing step I.e,

c-f

appears in the operator information area,

the terminal

when

)(

-f,

)(

c-f, or any other symbol appears in the

RESET

Display

the

a.

Set

the

b. Hold down the

then

release

the

operator information area.

Press

the

c.

The

pattern
the screen. Adjust the brightness control if
necessary.

switch

that

the raster is uniformly

the raster is uniformly blue.

and

blue rasters arc not uniform.

two purity potentiometers.

raster colors are not acceptable

Entry Point A.

D2Y02

to

is

probably using the convergence

is

attached

to

the IDPA

key and retry the action.

convergence

Normal/Test

'ALT'

both

keys. 'TEST' appears

following keys: / 7

'-

I -I

-'

appears

'PURITY'

1-4)

until the

red

attention

it

also

to

Normal

and

CONTROL

D2Y08.

an [DPA, the same

is

in manual mode.

pattern
switch

key and press 'TEST',

)(

-f

as follows:

to

at

the

0 Q

areai;)

or

Normal.

ENTER

center

to

on

of

to

back

in

The

following steps (2 through
times with the
screen.

2.

Use
green
superimposed
yellow pattern.

3.

Press

4.

Use

pattern
superimposed (as well as possible)
pink

5. Press
Go

6. Press the spacebar
pattern

7.

When
the
simultaneously in all
happens go back
converging.

8.

On the first pass through the complete fine

adjustments,

down
The

9.

On the second pass through the 'complete fine

adjustments.

the
further adjustment, press the spacebar once
return

10.
the screen, then there

position
Figure
have exchanged the amplifier card go

5.3.9; otherwise, go to
A.

J

1.
then release

5.3.4

J.

Set up a bright red

pattern

cursor control control keys

pattern

until the red

(as

the

following key: R

the

cursor keys again

until the blue

pattern.

the

following key: R

back

to

step 2

appears in the next position.

you press the spacebar after converging

13th

area,

the

to

when all J 3 patterns appear. hold

AL

T and press TEST

screen will clear.

when all 13 patterns appear. check

convergence

If,

on

Hold down the

Focus

Turn
Set

then
Press the following keys:

(alphabetic)

of

to

step 2.

the

second pass, you

of

the convergence coil assembly, see

4-8,

and correct it if necessary. If you

'AL

both

keys.

Adjustments

the

brightness control fully' clockwise.

the

Normal/Test

to

Test. .

7)

in different positions

closely as possible) to give a

at
once

(white) pattern appears

step 2

each pattern. If any need

pattern

are repeated 13

to

and

green images are

to

move the blue

and

red images are

and

least

once

to check.

or twice until the

J 3 positions. Until this

to

continue

then

Go

is

MAP 0600, Entry Point

T'

release both.

to

section 5.3.4.

cannot

a fault. Inspect the

key

and

press 'TEST',

The

screen will clear.

as follows:

switch to Normal

CONTROL

on

move the

give a

converge

to

section

and

0 I

the

and

3279

MIM

Chapter

5. Display Adjustments 5-5

3279

MIM

2.

Turn

the

FOC2

control fully counterclockwise.

3. Adjust the

image in the center

4. While examining the upper right corner of
screen,

counterclockwise.

improves (ignore the
will improve the overall focus.

5.

Turn

6.

Adjust the FOCUS 1 control for the sharpest

image at the center

7. Repeat the three prev:ious steps until there is no

improvement.

S.

If

worse,

previous best setting

9.

Press the following keys:

Verify that the focus on green

to.

(alphabetic)
Verify
and

compromise between the focus

and blue images.

12.

an

Key in: (alphabetic)
a.

'FOCUS1'

turn

FOC2

the last movement of

tUTn

it

Press the following keys:

that

the focus on' blue

FOC2

a little to achieve a goud

Finally inspect all three colors and verify

optimum focus setting has been achieved.

Green:
b. Blue:
c.

Red:

Alignment Mask

PIN

4423472

EC394472

Width and

Horizontal

Centering

242

mm

19.5

in.}

control for the sharpest

of

the screen.

the

FOCUS

1 control slowly

[f

the focus in the corner

center).

the

FOC2

one eighth

of

a turn clockwise.

of

the screen.

FOC2

back one eighth turn to its

and

made the focus

readjust

FOCUS!.

CONTROL

is

good.

CONTROL

is

good.

of

the red,

CONTROL

C.
CONTROL C CONTROL
CONTROL C CONTROL

C

0 Q

the

control

grc;cn,

that

0

Q.

0

l.

Chapter

5. Display Adjustments

5.3.5

Raster Controls

Note:

The

when the display
viewed from a normal operating position.

I.

2. Hold

3.

4.

5.3.5.1
Figure 1-4 shows the location

referred

following controls has insufficient range to produce

the desired adjustment, set it as nearly as possible

and continue.

1. Adjust the top margin

2. Adjust the WIDTH

3. Model 2 only Jumper

4. Adjust the

5. Model 2 only Remove jumper

6. Adjust

7.

8.

raster controls

Set

the

Normal/Test

down

both.

Jumper

C2G06

will fill the screen.

Attach

the alignment mask (Figure

CRT

face.

Raster

to

in the following steps. If

potentiometer until the top character row
centered in the top space
mask.

(H

CENT)

edges

of

the images arc correctly aligned.

(ground). (Disable interrow skip.)

bottom trace

divider line centers

the correct model) on the alignment mask.

HEIGHT

D2DOS.

the

trace

Information Area

of

Repeat from the beginning of section 5.3.5.1.

until the picture height and interrow gaps
correct.

'SKIP' potentiometer until the bottom

of

the characters

the alignment mask.

Remove the alignment mask.

may

is

the

AL

to

Centering/Size Controls

potentiometers until the vertical

of

be set accurately only

online, that is, converged, and

switch

to

Normal.

T key, press TEST, release

D2JOS (ground). Characters

5-3)

to

of

the controls

any

of the

(TOP

MAR)

on

the alignment

and

horizontal centering

C2J04

to

D2DOS

potentiometer until the

the last character

on

the

in

is

centered

row

HEIGHT

C2J04

the Operator

in

the SKIP space

above the

space (for

to

the

is

are

5-6

Figure 5-3.

CRT

Alignment

Mask

S.3.S.2

PiDcushioD

l.

Adjust the East and West
potentiometer
until

2.

Adjust the North and South
potentiometer so
of

the image are straight.

3.

Repeat steps 1 and 2 if necessary.

4. Remove the jumper

5.3.6

The adjustments

required

or

if

the

or too dim. Otherwise continue at section 5.3.7.

The maximum brightness

the screen is controlled by the R MAX and R MIN

potentiometers which

the display unit.

of

the

life
Compare

3279 if possible. before assuming that adjustment

necessary.

\.

Ensure
done

Set the

2.
back to Test.

3. Press
(alphabetic)

4. Turn

5. Turn the R MIN potentiometer to its mid

position.

6. Find an
fifteenth row. Adjust
until
View the display from directly in front

screen and tum back the potentiometer until the

'@'

legible.

7. Turn the brightness control fully
counterclockwise (but not past the intensity
override switch). Adjust the R MIN
potentiometer until the characters are just visible
(move
necessary) .

Turn

8.
Verify step

3279 MIM

on

the

vertical edges

Red

Brighilless_

in

after

red characters are known to be too bright

(see section 5.3.4).

the

the

the

is

the brightness control fully clockwise.

this section should only be

exchanging a

If

the

CRT

will be shortened.

the

red characters with those

that

the focus adjustments have been

Normal/Test

following keys:

brightness control fully clockwise.

'@'

near the right-hand side of the

center

of

clear, and the center

the

screen away from direct light if

6.

(E

the analog card (Figure 1-4)

that

are

brightness

the

+ W) pincushion

of

the image are straight.

(N

the top

C2G06

of

set during manufacture

switch to Normal then

the

+ S) pincushion

and

bottom edges

to 02108.

CRT

or amplifier card

the red characters on

is

set too high the

of

another

CONTROL

R MAX potentiometer

'@'

is

of

B 0

just filled in.

of

the screen is

the

.

5.3.7

Color Balance

Note: Do not mo.., the R

potentiometers during this procedure.

This procedure sets the brightness of the green

blue characters which also controls the mixed

colors: yellow, pink, turquoise, and white.

is

If the 3279

printer adapter, misconvergence may cause

difficulty.

1.

Set the

2. See

3.

Connect

(ground). This will maintain convergence during
Test Mode.
required.

Set the

4.

of

is

CONTROL

pattern

5. Jumper C2W09 to C2W28 (color bars).

6. Set

potentiometers

7. Ensure

clockwise.

8. Adjust the G MAX potentiometer until the
green areas are as bright as the red, and the
yeDow

9. Adjust the B
areas are as bright as the red, and the turquoise,
pink, and white areas are good.

10. Jumper D2Y02 to D2Z04 (reverse video); use
E2Z04 if D2Z04 is not available.

11. Turn the brightness control to minimum

(counterclockwise) but not past the switch into

intensity override.

12. Adjust the G MIN and B MIN potentiometers

so that the green and blue areas

the red; and the yellow, turquoise, pink, and
white areas are good.

,13.

not connected to an active display

Normal/Test

Figure 1-6 for jumper pin notation.

the

See section 5.3.3 for more details if

Normal/Test

of

characters.

the

B MIN

that

the brightness control is turned fully

is good.

Remove the jumper from D2Y02.

Chapter

MAX

switch to Normal.

CE

jumper D2Y09 to D2Y08

switch

C.

The screen fills with a

and

G MIN color balance

to

their

mid

MAX

potentiometer until the blue

5. Display Adjustment. 5-7

or R

to

Test

positions.

are

MIN

and

as

key in:

dim

and

as

3279

MIM

14. Turn the brightness control

back again
good over the whole range

'special

further
to R

15. Remove the jumpers.

5.3.8

1.

If

adjustments.

should

within the procedure

section 5.3.

2. If you have been through
procedure three times.
satisfactory, go to

3.

Return

setting.

Replace the

covers.

5.3.9

The

amplifier card

controls for

amplifiers.
plant

if

you

exchanging this card, readjustment may be
necessary.
have
high,
insufficient control

Before making any adjustments:

1.

Use
move
See

to

check

attention

to

small adjustments if necessary

MAX

or R MIN).

Repetition

necessary repeat

and

too little

the

Only small changes in

be

necessary and the repetition steps

MAP

the

brightness control

Set

the

Normal/Test

Maintenance Manual

Convergence
Controls

fail

Online

MAP

may

one

or more

These

are

should

to

When

patterns

the

preset

NOT

achieve dynamic convergence

the

gain

movement

move

to

align precisely.

Test 7 to

pattern

in

0600.

to

that

the white areas. Make

the

can

Amplifier

contain

of

need

to-converge;

in

confirm

the

maximum

the

color balance

of

the control. Pay

sequence

of

fine

the

be omitted.

the

complete

and

the

display

0100,

Entry

to

a normal

switch

and

Gain

separate gain

the

four convergence

at

the

manufacturing

adjustment. However,

is

too

low.

the

large steps with

correct

when

that

you

direction.

(but

settings

Go

is

still

Point

to

Normal.

close

after

patterns

can

too

and

is

not

to

A.

not

the

Chapter

I 2. Measure

3.

4. Inspect

5. Normally controls R,

6.

7.

8.

If

convergence

5.3.3.

the

supplies to the amplifier card:

Amplifier
Test
Figure

If

page 2

settings

Blue) are set
Lateral)

If

any
set
routine again (section
gain

If

convergence still fails,
maximum gain

If

convergence still fails,
back
MAP

Card

Point

(see

6-10)

K + 12 V de
N

any

of

these checks fail, read

and

go

the

amplifier

of

the gain controls.

3/4

is set fully clockwise (Maximum

are

set

them

to

normal

is

set

wrongly adjust only

to

the

settings

0600

Entry

is

now

5. Display Adjustments 5-8

Voltage
and

Tolerance

to

MAP

card

G,

clockwise, and

to

a position

and

5.3.3).

and

try

you

Point

working

-12 V de

0600

and B (Red,

try

set

again (see section

put

wrote

A.

(Entry

and

write

that

is

the

convergence

If

you

that

all controls

the

down.

return

MAP

BLAT

not

gain

to

±1.S V

±1.S V

Point

down

know

control.

section

0000

A).

the

Green

(Blue

Gain).

normal.

which

to

5.3.3).

controls

Go

to

and

Chapter

6.

Support Infonnation

6.1 Block Diagram

lCC

BlC

Inputl

Output

SERDES

Control

Logic

FBII
FBO

Clocks

C2

lCC

BlC

lCC

Refresh

Storage

Character
Generator

Color

Control
Video

Outputs

C2

D2

D2

Video

Output

Facility

C2

*

Optional

Figure 6-1. 3729 Block Diagram

MIM

3279

Power

Supply

Card

Chapter 6. Support Information 6-1

3279 MIM

6.2 3279 Control Signals

6.2.1

Waveforms

I---

e-'

Chapter 6, Support Information

6-2

r

\

MHz

~

+-

-

Oock

C2

MOB

If

bad, change card C2

t-----

r

I

,/

- -

--

Oock

6-2

(Part 1 of

Sync.

It
I-H

3),

Internal

I{,-

-

Waveforms

~-

Feature

Scopepoint

x 10 probe.

1\

1\

'r

14

Scopepoint C2 P13 Sync. Internal

x 10 probe. If bad, change card C2.

Figure

0.2

then

h

--

20

I

-1--

j.1s/cm,

1 V fern

B2,

02,

E2.

]

.\

1">1

--

-

f-

ns/cm, 1 V/cm

ov

f--

ov

I---

Horizontal Retrace

Scopepoint

x

ov

c--

I--

10

probe.

82

G13 Sync.

If

bad, change card

I

64

~s

(nom)

Internal

02

20jis/cm, 2 V/cm

then 82.

l}

ov

:+

Horizontal Sync.

Scopepoint

x

82

J13

10

probe. I f bad, change card

Sync. Internal 10 ps/cm, 1 V/cm

82

then analog.

-

-h.

1

Example
Screen

Scope
Parabola.

analog.

---~--

- -

--

J

Ir-l

L-

of

Convergence Parabola

point

82

S06

If

unable

-- --

--

--

r-'

i

for

Sync, etc. as
to

for

converge, change card

-

r-'r

f..J

Badly Converged

Convergence

82

then

~;..,

....

ov

--

M

r

}'

~

r~

.~

!~

~rt

ov

J,J

\

-

Convergence Parabola

Scopepoint

2

0.2 V/cm x 10 probe.

If bad, change card

ms/cm

82

506

Main sweep,

Sync

C2

Z08 (Indicator Row)

10

Jis/cm. Delayed sweep.

82

then

analog.

Use

~-}--+--+--~~~-+--+-~---r--t--0v

- Skip (Model 2

Scopepoinl

x

10

probe.

Figure 6-2 (Part 2 of 3). Waveforms

3279 MIM

only)

62

G 1 0 Sync. I nlernal 1 V fern, 0.1 msfem

If

bad. change

card

C2

then

02.

-

Scopepoint

If

10.8

ms

nom (Mod

13.8 ms

nom

(Mod

Skip

Out

(Model 2

82

bad, change card

21

3)

only)

Jl1

Sync, Internal 1 V/cm x 10 probe.

82

then

analog.

Chapter 6. Support Information 6-3

3279

MIM

Chapter

6. Support Information

6-4

f-.-,

/

1

I

1\>..1

-

Dot 0

Scopepoint C2

x 10 probe. If bad, change card

+ Indicator Row

Seopepoint C2

If

bad, change card

-

--

804

Sync. Internal 0.1

zoa

Sync. Internal 1 V/cm x

02

- - -

then C2, E2.

1\

p.s/cm, 1 V/cm

C2

then

r

1-1-

02,

j

E2, F2.

10

V-

-

probe.

f-----

ov

+ Videotime land

Seopepoints

1 V/cm x
E2,

r-

Frame Sync.

Seopepoint

If

C2

10

probe.

F2.

-f--

~~::::

~::

C2

bad, change card

Ir

-f-

+7

x Trig)

002

C2

Jl0

Sync. Internal

If

bad, change card

-

:~::

~:-+-+-+----1f--+---l

t

G12 Sync. Internal 1 V/cm x 10 probe.

82

then analog.

0.2I's/cm,

02,

then C2,

-

f--

ov

Figure

6-2

(Part 3 of

3). Waveforms

.,.,

-.b

6.2.2 Activation Sequence

14

MHz Clock

+

00tO-8_

I

B,

C, 0 Clocks _

I

Character Counter

I

Line Counter _

I

0

-..-.

Row

(Row

~ounter)

Vertical Retrace

I

Frame Sync

This diagram
main control signals in the 3279, and the sequence
in which they are developed_

The following connector strip diagrams show how
these signals are distributed around the machine.

is

Feature Clock

+7x Trig

VJdeo Clock

Horiz Sync
Convergence
Parabola

Skip

~

Vertical Skip

a representation of some of the

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Chapter

CAUTION:

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FI

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19

tning

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or

Effective

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Cor

1

6. Support Inform

Gmund

* Wires

may

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Box

Metalization

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P

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6-5.

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liil

MSR

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Video

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P3

Power

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Pl

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Note: See also Figure

ground connections.

Cable details are given in
the wiring table,

Flex

6·5

t page

for

Figure 6-6. Cabling Diagram

3279 MIM

(,I

P18

P178 P178

Amplifier
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Analog
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P4 P4

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P178

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P5

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Chapter

6. SUPl)ort Information

(ff)

P26

(aal

Switches

AalA

P16

Al
P13\

P15

P13

I

Video

Card

P14

6-19

3279 MIM Chapter 6. Support

Wiring Table (see Figure

Cable Description From

+5
+5
+5 V de
+.5
+5 V de
+5 V de
+

12

-5 V de A2D06

-5 V de

o V de A2D07
o V de Power Supply A2B07

o V
o V de A2B08
o V de A2D09
o V de

-12 V de A2BlO
+8.5
+8.5
+8.5
+8.5

b

d Line (Switched)

e

g Security Key

h Battery

Line Hard-wired to fuseholder

Neutral P2-2 P3-15

Ground

Ground Screw

Degauss P3-12 P27-2
Neutral

Neutral
Neutral P2-3 2 switch

Line

EHT Anode Bleed Asm 2

+5

o V

Sound

Security
Security Key

Battery -ve

6-6)

V de
V de

V de

Y dc

de

V de

V de
V de
V dc

(Switched)

V dc (red)

dc

(black)

Alarm (yellow) A3D05

Op

Key Ins P9-4

Gnd

+ve

To

A2D02

A2B02
A2D03
A2B03
A2D04

Hard-Wired

at

Screw #6

#6

P3-13 P27-1

P2-1 6 hard-wired
P2-2

P2-4

A3D02
A3D08

P9-1 A3B03

P9-3

P20-4

P20-1 A3B07

A2B04
A2B05

A2B06

A2D08

A2B09

A2Dll
A2Bll
A2D12
A2B12

P3-1O

P3-7
P3-16

3 at power

5

P25

P8-1
P8-3
P8-4

A3D04
P4-6

A3D07

Info~ation

6-20

Wiring Table (continued)

Cable

k

m

n

p

q

Description From

Vol Pot I
Vol Pot 2 1 (eew) + 2

+12

V de

± 12 V

de

-12 V

de

LOpT

Return 1'7-1

LOpT

Sense

de Return 1'3-4 1'4-14

103 V
103 V

de

EHT

Horiz Drive

Horiz Return 1'6-3

Vert Drive 1'6-1 yoke

Vert

Return 1'6-4

Horiz Supply Voltage 1'6-2 1'6-5

+5

V de

Scan

Bit 2 1'23-3

KB

Aek

KB

Ident Bit 0 1'23-17 DS80S

Clicker

-5 V de 1'23-19 DSB06
Make/Break
KB

Ident Bit I 1'23-18 O5B07
DC Return
Scan Bit 0 1'23-23

Bit 1 1'23-8

Scan
paR

Data Available 1'23-9 DSDIO
KB

(dent Bit 2 1'23-22
Scan

Bit 3 1'23-10 DSD11
+8.5 V de
KB

Ident Bit 3 1'23-7

Scan

Bit 4 1'23-14 DSBI2

Bit 5 1'23-12 1)5DI3

Scan
Scan Bit 6 1'23-2 D5B13

+5

V de A3D03

-5 V de
+8.5

V de

Skip

return

To

3 (ew)

1'3-1 1'178-3
1'3-2
1'3-3 p17B-6

1'7-2

1'3-5

1'21

1'6-6

1'23-16

1'23-4

1'23-5

Alarm
Alarm A3

P17B-4

1'3-9
1'3-8

1'4-15

Bleed I

liard-wired
at

1)51)03
I)SB04

1)51)05

I)SD06

1'23-6 I)SD07

1'23-11

1'23-21

DSDOS

1)5808

1)51)09
DSB09

I)SBIO

1'23-20

A3806
A3811
A3Dll

I)SBll
DSI)12

1'4-34
1'4-29

1'4-35
1'4-26

AI

3279

MIM

Chapter 6. Support Information 6-21

3279 MIM

Wiring Table (continued)

Cable

q

Description

Vert Sync

Hafiz Sync

OV
Ground

Ground Separator A3B04

Ground Separator

12

V de LOPT

12 V de LOPT Return ASB02

Ground Separator ASD03

-12

V de ASB03

Lateral Blue ASD04

+

12

V de

Radial Red

Ground Separator

Radial Green ASD06

Ground Separator ASB06

Radial Blue

Ground Separator ASB07

Blue Bright-Up
Ground Separator ASB09

Display Ready

12

V de LOPT

Bri

Pot Wiper

Br;

Pot

Bri

Pot

Return

o V de ASDOS

Ground Separator

+S V de ASDIO

Ground Separator ASBlO
Green Video

+8.S

V de

Red Video

Ground Separator

Blue Video

Ground Separator

o V de P12-6

+S

V de P12-7

Display Ready P12-8 P4-33

(-ISO V)

Chapter

6. Support Information

From

A3DI2
A3DI3
A3B09
A3BIO

To

P4-2S
P4-1
P4-30
P4-4

A3BI2

ASD02

ASB04
ASDOS
ASBOS

ASD07 PIS-S

AS

009

P4-32
P4-31

P4-44
P4-41
P4-20

ASB08

ASDll
ASBll
ASDl2
ASBl2
ASDI3
ASBI3

PIS-13
P1S-12
P1S-1O
PIS-IS
PIS-II
PIS-14
PIS-9
P1S-S
P1S-7
P1S-6

PIS-4
PlS-3
PIS-l

P17B-7
PI7B-S

PI7A-1
P17A-3

PI7A-S

P14-4
P14-6
P14-1
PI4-S
PI4-S
Pl4-3

P14-7
P14-l0
P14-9
Pl4-ll

P4-10
P4-12

6-22

Wiring Tahle (continued)

Cable Desaipfiofl

w

BRII
BRI2
BRI3

Intensity Override Sw. 4
Intensity Overriue Sw.
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Test

rest

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bb

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dd

cc

ff

gg

hh

de

Operate

Base Col

Supp

o V

de

Test

Operate

Color Switch

MOl1ocasc

70

V de

70 V de Return

+6.3 V de

+6.3

V de Return

1 tltcnsity

0\

(+2RO

Al

I:oeus (6 kV) P26

Blue Radial Return
HIue

R<ldial
Green Radial Return
Green Radial

Reel

Radial Return

Red Radial Drive

Vertical Purity

Purity Return
Horizontal Purity Drive
I.ateral Drive
I.alcral Return

1+3

f'rom

PII-6
PII-7
PII-X
PII-3
1'11-4
PII-5

1'12-3 P2X-3

rest

Sw.

Top

rest Sw.

Center

A.a/A

Sw. Bottom

A.a/A

Sw. Center

To

P4-17
P4-19
1'4-16
1'4-42
P4-IX
P4-43

1'12-4
1'12-5

P2X-5

P4-9

Test Sw. Bollom P28-4

0000/00

Sw. Bottom

0000/00

Sw. Center

P2X-3
P2X-4

Switch 1'28-5 A31113

crride

to

+450 V del

Drive

DriH'

Drive

1'28-1

P4-23

P4-24
P4-25
P4-22
P4-13

1'5-3 hard-wired

PI9-X
P19-7
PI9-IO
1'19-9

P

19-12

P19-11
P19-1 Purity Card I

P19-4

P 19-3 Purity Card 3
P19-5
P19-6

P2X-I

P4-7

A3B05
A3B02
A3J)06

P16-1
P16-7
P16-3
P16-4
1'16-5

hard-wired

Radial Card
Radial

Radial

Radial Card 4
Radial
Radial Card 6

Purity

I.ateral Card 2
I.ateral Card I

C~Hd

Card

Card

Card

2

3

5

2

3279

MIM

Chapter 6. Support Information

6-23

3279

Wiring

Cahle

jj

kk

MIM

"I'ahlc (continued)

Desaiplion

Red

Grid

Green

Grid

Blue

Grid

Sync

Out

Rcd

Video

Grcl..'n

Video

Blw

...

' Video C41107 133

Wrap

Tesl

SYIl":

Polarity

Ground
Ground

+5

V de

Signal Test I.amp

Blue

Fnhancc

From To

P17A-7
P17A-9
PI7B-1

G2B02
G2D02
G2B03
GlB04
GlD04
G2BOS
G1DO)
G2D06
G2B07
GlD07
G2110X
G2B09
G2D09
G2BIO
G2DI0

GlDl1

G2BI2

G2f)

11

GlBI3
G2DI3

G2G02
G2J02

G2(;03
G2G04 G4G04
2J04
G2JO)

C4B04
CIBO)
C4BOl>

C4D02

Col

1102
C41)OX
(41)08
C41)03 P34-1
C-'lII03 P34--'I
(41)04

Chapter

6. Support Information 6-24

P 15-1
PI

S-S

PI S-3

·G4B02
G4D02
G4H03
G41104
G4D04
G4BOS
G4DO)
G4D06
G4B07
G4D07
G4BOX
G4B09
G4D09
G4BIO
G4DIO
G4DII
G4BI2
G4D
G4BI3
G4DI3

G4G02
G4J02
(;4(;03

G4J04
G4JOS

130
131
132

Video CII Sw.

Sync Pol Sw. - Bot
Video

Sync

Video

12

etl

PoiSw.

01

Sw. -

Sw.

-

-

Or

- Bot

Top

etr

6.S

CRT

D·

five Circuits

Figure 6-7. CRT Drive Circuits

3279

MIM

Chapter 6 S . upport Information

6-25

3279

MIM

6.6 Bezel Wiring

(Linked

by

Logic Card)

Power A2 D03 A3

gAI3110

A3DlO

----~

any

DO';.3~

____

rf34

~)30

I'~I

-

~~;-

1

.,

____

~'2~'~~~----~~-------~-------_K~.~7------_,

IOJ.,

I ,."

___

~

- 7

1

f--~)-

h4

<--

P4

1

6

---"-7/

P4

!~

_~»

I

.25

V

~)

I, l ::~)

)",..-1--------------------; '\ J Intensity

~

1

43

~

119l,

~/

I

I .",,'j,,

I

91

k{

l Sockets 1Il q

1 150 V

--

P4

11

Analo!=l Ccud

Chapter

6.

Support Information

.5

V

0 V I 6

Drsplay Ready 8 'V\I'- RDY

D2

GO~

C2

g05

A3~

C2

D2~~~.~4~

J06

B2

J06

A3

D06(,

D2ciG;:.lc::3'--..:.A..:.3::o-B'-13=-'.::o,~'\>1h5l[

-~--------------

.f.§.

~

Sound

Alarm

D2

f--.,

f--~nlPlrfre.

f---

L

A3

D02 1

15

V~3

J05

_

_______

008

0

va--.c....:+'I'>-I-='-k>

0-..........~~D~O::.5_4'+9>+'-yW"'-I-o

Card

-----

____

_____

D2

~~~~

02

J~ec.

______________

RD

3 BK

L-

L---

IPI7A~II~_

-----------1<

---

_ ___

- 1<26

~~t:03

Sec, Key Opecatod I

Pili

tJ11

r--~I

~

P28

L_

107_

~

~_

__

~

1

;(/

c.::.

I

L

__

~_..1?B

L.

Al

__

~-

A3

PI'

-------IK·«(-1

IS

18 3

__

Key Installed I

r-3'

'0--

~~0_~3~,1

1-1

~

3

(~TMeo'dte

5

4

~

Test/Normal

___

~

~

B

.l

K v

~

I

li-

~V

_rq3

- 2 AJorm Pot

1

3

"-------l

2 Pot

_I

r,

11

P9

14

T Keylock

-

1 I

__ 1 _____

Bezel

A"--

~

v Disp

Led Card

Colorl

Monochrome

0000100

A.a/A

11

kUI

Override

Brrghtness

1100k!li

NC

c/Secuntv

~O

6-26

PWR

Good

--1

Figure 6-8, Bezel Wiring

~~~

~'-

Ground Braid
Clamp

""

Video Card - Rear

Figure 6-9. Video Card Test Points

View

Jumper

link

Test

Point

5

8.5
70

-'--

6

RI
GI
BI
400

GT

RG

GG

BG

Notes:

1.

Rllall

Cards

2.

RI

Icard IBM Part 5148396)

CAUTION:

short-circuit land patterns and damage cards.

Probing the wrong RI point may

Description

+5

V de

de

+8.5 V

+ 70 V de (video amps)

Return 0 V

+6.3

V de (Heater)

Red

Green Inputs

Blue

Anode Voltage (+-280 to

Intensity Override

Red

Green

Blue

except IBM Part 5148396)

Video Amp,

10.5

Grid

Voltages

10

to

V)

(0.5

-150

V)

+450

VI

V del

6)

6)

I I

1e1

Amplifier

Card

8

BO

,

co

DO
EO
FO
GO

J 0

"0

K
LO

MO

~

NO

---

\0

0:

:0

I

~)6)

-

-6)

6)

6)

6)

R G B

6)

6)

P17A P17B

Figure 6-10. Amplifier Card Test Points

3279

MIM

Test Points

~'

P19

~

0p18

A

Blue Lateral 1 Convergence

B Blue Coil
C Green Drive

0

Red

E

Red

F

Green Analog Inputs

Blue

14

16

G

H Blue Lateral

Blue Bright-up

J

K +12 V

-150 V de

M

+12 V de

N

-12 V de

1

from 82

card

de

IFused)

Chapter 6. Support Information 6-27

3279

MIM

6.7 Keyboard Jumpers and Cables

Chapter 6. Suppon Information 6-28

Jumper

Position

Reserved
Reserved

Typewriter 3

Type'!Vriter

with

Numeric

ICO

ICO

Numeric

Lock

lock

is

Data Eottry 2
Data Entry with Numeric Lock
Data Entry. Keypunch
Data Entry. Keypunch

with

Numeric Lock

APL with

PSH

RPQ

Text
Text with Numeric Lock

APL

APL

with

Numeric Lock

Typewriter with PSHICO
Overlay with

Reserved

If

PSHICO = PS, Highlighting and Color select on PF Keys

PSH

ICO present,

PSH

1 U

1,3

1,2
2,3

1,2,3
0
0,1
0,3
0,1,3
0,2
0,1,2

0,2,3

}

0,1,2,3

specified at CU

customization

A B

Keyboard I D

normally

UP unless

jumpered

KeYboard_1

10

bits

~::Ig=gl

bits

~::::

8=8

10

Jumper

Block

Logic Card

Keyboard I D response (See Test Model 3)

Ensure that the Aa/A switch

Model 2

..

C S

E
B

c

e
U

LJ

4 6

U

jj

Model 3

M
W

G

~

w

Z

g

E

0

'It

I

0

is

set

4 b

and

not

by

the

keyboard

I/O

(not

valid

on

3276

CUI

Keyboard

Connector

"-"'-----B02

Clicker

to

Aa

Asm

CI

icker Pins

Figure 6-11. Keyboard Logic 'and Connector

Keyboard

Cable

(within the

3279)
P23

,..----;-

~\

B13

604

003
005
B05
006

B07
007
806
012
Bll
009

809
010
Bl0
011
B08
008

013

'--0'5

t

Logic

Gate

Connector

14

15

0

16

17

lB

19

20

21

22

23

24

0

25

0

Keyboard

Connector

on 3279

~

0

2

3

4

5

6

7

8

9

10

11

12

13

0

---

14

2

3

16

4

17

5

18

6

19

7

20

8

21

9

22

10

23

11

12

Scan

Bit 4

Scan

Bit 6

Scan

Bil2
+5 V
KB

Ack

KB Ident

8it

Clicker

KB Ident Bit 1

Make/Break

-5V

KB Ident Bit 3

8.5V

Scan

Bit 1

POR

Data

Avail

KB Ident Bit 2

Scan

Bit 3

Scan Bit 0

de Return

Scan

Bit 5

External

Keyboard Cable

0

1

---

B09

B13

013

003
002
004
B03

DOS

B12
B06
010
Bll
006
007
B07
009
B08
B05
008

Bl0

Keyboard Internal
Connector

~4

Figure 6-12. l.ogic

3279

MIM

Gale

to Keyboard Cable

Chapter 6. Support Information 6-29