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
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