IBM System/34 User manual

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SY31 -0457-5
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IBM System/34
5340 System Unit
Maintenance Manual

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-- - SY31-0457-5
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IBM System/34
5340 System Unit
Maintenance Manual
~(I
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Sixth Edition (January 1981)
This is a major revision of, and obsoletes, SY31-0457-4. Changes or additions to
the text and illustrations are indicated by a vertical line to the left of the change or
addition. Changes are periodically made to the information herein; these changes
will be reported in technical newsletters
or in new editions of this publication.
Use this publication only
for the purposes stated in the Preface.
It is possible that this material might contain reference to, or information about,
IBM products (machines and programs), programming, or service,s' that are not
announced in your country. Such references or information must not be construed
to mean that IBM intends to announce such IBM products, programming, or
services in your country.
Publications are not stocked at the address below. Requests for copies of IBM
publications and for technical information about the system should be made to
your IBM representative or to the branch office serving your locality.
'This publication could contain technical inaccuracies
or typographical errors. Use
the Reader's Comment Form at the back
of this publication to make comments
about this publication.
If the form has been removed, address your comments to
IBM Corporation, Publications, Department 245, Rochester, Minnesota 55901.
IBM may use and distribute any of the information you supply in any way it
believes appropriate without incurring any obligation whatever. You may, of
course, continue to use the information you supply.
© Copyright International Business Machines Corporation 1977, 1978, 1979,
1980, 1981
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This 'manual contains maintenance information that will
be used by the customer engineer who installs and
maintains the IBM System/34. Most maintenance on
System/34 is performed using this maintenance manual
and the System/34 MAPs (maintenance analysis
procedures)., Additional information about this service
method is in Section
01-100 How to Use the System/34
MAPs and Maintenance Manual.
Customer engineers using this manual are assumed to
have been trained on System/34 as described in the
5340 Technical Service Letter (TSL).
The 5340 System Unit Theory Diagrams Manual has a
list of abbreviations and a glossary that gives the
meaning
of words and abbreviations used in this
maintenance manual.
There are several DANGER and CAUTION messages in
this manual. You can use the blank lines
below each
message to translate it into your own words.
Note: This manual follows the convention that he means
he or she.
Preface
'Related Publications
• IBM System/34 Operator's Guide, SC21-5158
• IBM System/34 Functions Reference Manual,
SA21-9243
• IBM System/34 5340 System Unit Theory Diagrams
Manual,
SY31-0458
• IBM System/34 5340 System Unit Parts Catalog,
S131-0632
• IBM System/34 Installation and Modification Reference
Manual: Program Products and Physical Setup,
SC21-7689
• IBM System/34 System Data Areas and Diagnostic
Aids Manual, L
Y21-0049
• IBM System/34 System Support Program Logic
Manual: System, L
Y21-0050
• IBM System/34 1255 Attachment Feature
Theory/Maintenance Manual, SY31-0521
iii

iv
ELECTROMAGNETIC INTERFERENCE
United States Federal Communications Commission
(FCC) rules require IBM to
publish the following information, which applies to each unit (including modems and
terminals) described in this manual (hereafter called equipment).
WARNING: This equipment generates, uses, and can radiate radio frequency energy,
and if not installed and used in accordance with. the instruction manuals, may cause
interference to radio communications. It has been testeeJ and found to comply with the
limits
for a Class A computing device pursuant to Subpart J of Part 15. of FCC rules,
which are designed to provide reasonable protection against such interference
when
operated in a commercial environment. Operation of this equipment in a residential
area is likely to cause interference, in which
case the user at his own expense will be
required to take whatever measures may be required to correct·the interference.
Instructions Pursuant to FCC Pa~t 15, Subpart J
1. This equipment should not be.installed less than.30 meters (98.5 feet) from
radio or television receivers or their receiving antennas.
2. This equipment should
not receive its power from branch circuits that also
power radio or television receivers.
If this equipment cannot comply with the above distance limitation:
1. Turn the equipment and the receiver on. If no interference is apparent, no
further action need be taken.
2. If interference occurs, reorient or relocate the equipment, the receiver, or both.
3.
If interference still occurs, contact your IBM representative.
("
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Contents 01-000 INTRODUCTION TO MAINTENANCE -
I/~
-
I 02-000 REFERENCE INFORMATION
\~
05-000
POWER
-
07-000
5211 PRINTER ATTACHMENT •
,"' .... _"
-
( \ 08-000 3262 PRINTER ATTACHMENT
\\".-J
09-000 62EH DISK DRIVE -
10-000
62PC DISK DRIVE -
"'-'" 11-000 WORK STATION ATTACHMENT -
( \
\1
CE PANELS -
----./ 13-000
15-000 PROCESSING
UNIT
-
21-000 OPERATOR PANEL •
23-000 33FD DISKETTE DRIVE -
25-000 53FD DISKETTE DRIVE
..
27-000 72MD DISKETTE MAGAZINE DRIVE -
30-000
MULTILINE COMMUNICATIONS ADAPTER -
-,
U 31-000
DATA COMMUNICATIONS (FIRST OR SECOND COMMUNICATIONS ADAPTER) -
40-000 1255 MICR ATTACHMENT -
45-000 INSTALLATION INSTRUCTIONS •
80-000 ERROR
INFORMATION'
-
81-000 Main Storage Processor
•
82-000 Control Processor
•
83-000 Disk -
84-000 Diskette -
1---,\
~~
85-000 3262
and 5211 Printers -
86-000 Work Station Controller
III
87-000 Display Station -
., ............ "
I' 'I
, ) 88-000 5256
and 5225 Matrix Printers
III
"-_/
..
89-000 Data Communications
..
99-000 SYSTEM/34 DIAGNOSTIC SERVICE GUI
DE
•
0

".----'-.
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Ensure that you understand and observe the safety
precautions printed in the CE Safety Practices card that
is used in the country where you work. A copy of the
card that is used by customer engineers who work in
the U.S. follows.
CAUTION AND DANGER NOTICES
Throughout this manual, the word DANGER is used to
inform you of an action that could cause you to receive
an injury. The word CAUTION is used to inform you of
an action that could damage the machine that you are
working on, or affect the running of the customer
program.
DANGER AREAS OF SYSTEM/34
Observe the following danger conditions when working
on the System/34:
• Be especially careful when working in areas of
System/34 that contain parts that become hot during
normal machine operation, areas where high voltage
is present, and areas that have moving parts.
• Do not touch the diskette drive belt while the diskette
drive is running.
DANGER NOTICES
The following danger notices appear throughout this
manual in the sections named:
05-100 Power Introduction: Set the circuit breaker (CB1)
to Off if you want all voltages off. With the IPO switch
turned off and CB 1 on, AC line voltage is still present at
the control supply and DC output voltages from the
control supply are present at the A-A 1 board, the
operator panel, and the CE panel. Because of thf.
charge on the capacitors in the arc-suppression
networks across K1 and K2, a voltage is still present on
all circuits supplied by the contactor points when K1
and K2 are de-activated (see paragraph 05-315).
Safety
05-315 Power AC Box: When K1 and K2 are
de-activated, a voltage is still present in the circuits that
are supplied by the points of the contactors. The
voltage is present because of the charge on the
capacitors in the arc-suppression networks across the
points of the contactors.
05-500 Immediate Power Off: Set the circuit breaker
(CB1) to Off if you want all voltages off. With the IPO
switch turned off and CB1 on, AC line voltage is still
present at the control supply and DC output voltages
from the control supply are present at the A-A 1 board,
the operator panel, and the CE panel. Because of the
charge on the capacitors in the arc-suppression
networks across K1 and K2, a voltage is still present on
all circuits supplied by the contactor points when K1
and K2 are de-activated (see paragraph 05-315).
09-020 62EH Disk Enclosure Removal: The disk
enclosure weight is i2.5 kg (27 pounds). Clear a space
for the disk enclosure before removing the disk
enclosure from the machine.
09-030 62EH Drive Motor Removal and Replacement:
CB 1 must be off to remove AC voltage from ACTB3 and
ACTB4.
09-035 62EH Motor Start Relay Removal: CB1 must be
off to remove AC voltage from the motor start relay
,erminals.
09-050 62EH Brake Assembly Adjustment: Ensure that
the disconnected wires are away from ACTB3 (lower
drive) or ACTB4 (upper drive).
220 Vac is present on ACTB3 and ACTB4.
09-120 62EH Cable and Card Locations: 220 Vac is
present on ACTB3 and ACTB4.
10-020 62PC Subframe Removal: The subframe/ disk
enclosure weight is 16 kg (35 pounds). Clear a space
for the subframe/ disk enclosure before removing" the
subframe/disk enclosure from the machine.
Safety

10-030 62PC Disk Enclosure Removal: The disk
enclosure weight is 9 kg (20 pounds). Clear a space fo.r
the disk enclosure before removing the disk enclosure
from the machine.
10-080 62PC Motor Assembly Terminal Block Removal:
CB1 must be off to remove AC voltage from this circuit.
10-090 62PC Card Gate Fan Assembly Terminal Block
Removal: CB1 must be off to remove AC voltage from
this circuit.
10-100 62PC Drive Motor Assembly Removal: CB1 must
be off to remove AC voltage from this circuit.
10-130 62PC Card Gate Fan Assembly Removal: CB1
must be off to remove AC voltage from this circuit.
23-060 33FD Safety: The drive motor case may be hot
and may burn your hand. When the drive motor is
operating, do not touch the drive motor case or the
drive belt.
23-170 33FD Drive Motor Removal: The drive motor
case may be hot and may burn your hand.
23-170 33FD Drive Motor Replacement: To prevent
personal injury, position the two large square holes in
the motor frame so the holes are under the bracket.
The holes are large.enough for a finger to go through.
25-020 53FD Safety:
1. The system supplies the alternating current and
direct current power. Voltages are present on the
connector terminals in the diskette drive when the
drive motor is turning.
2. Motor and solenoid cases become hot after
continuous use; wait enough time for parts to cool
before servicing.
25-490 53FD Head/Carriage Adjustment: Voltage is still
present at the power connector when the head/carriage
is disconnected and power is on.
25-510 53FD Head/Carriage Replacement: Voltage is
still present at the power connector when the
head/carriage is disconnected and power is on.
2
25-520 53FD Diskette Drive Solenoid and Bail Service
Check: Voltage is still present at the power connector ...
when the diskette drive solenoid and bail are.l;·'
disconnected and power is on.
25-530 53FD Solenoid and Bail Adjustment: Voltage !s
still present at the power connector when the solenoid'
and bail are disconnected and power is on.
, The solenoid case becomes hot after continuous use. '
25-540 53FD Solenoid and Bail Removal (Machines with
Taper Pin Block): Voltage is still present at the power
connector when the solenoid and bail are disconnected
and power is on.
25-550 53FD Solenoid and Bail Removal (Machines
without Taper Pin Block: Voltage is still present
at the
power connector when the solenoid and bail are
disconnected and power is on.
25-600 53FD Diskette Drive Motor Removal: The motor
case becomes hot after continuous use.
25-610 53FD Drive Motor Replacement (60 Hz motors):
To prevent personal injury, if your motor case has two
large holes, position the two large holes in the motor
frame so the holes are under the bracket. The holes are
large enough for a finger to go through.
25-690 53FD Stepper Motor Replacement: Voltage is
still present at the power connector when the stepper
motor is disconnected and power is on.
25-710 53FD Pulley and Clamp Replacement: Voltage is
still present at the power connector when the pulley and
clamp are disconnected and'power is on.
25-840 53FD Phototransistor Amplifier Service Check:
Voltage is still present at the power connector when the
phototransistor amplifier is disconnected and power is
on.
27-020 72MD Safety:
1. The system supplies the alternating current and
direct current power. Voltages are present on the
connector terminals in the diskette drive when the
drive motor is turning.
2. Motor and solenoid cases become hot after
continuous use; wait enough time for parts to cool
before servicing.
........ " ...... '
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(
"~"''''' .. ,~ ...
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'----)
(-\,
,,--/
27-200 72MD Removal and Replacement: The 72MD
unit weight is 18 kg (40 pounds).
1-
27 -295 72MD Carriage Bed Orient Adjustment: Voltage
is still present at the power connector when the drive
motor power cable is disconnected and power is on.
27-600 72MD Head/Carriage Service Check: Voltage is
still present at the power connector when the
head/carriage is disconnected and power is on.
27-605 72MD Head/Carriage Adjustment: Voltage is
still present at the power connector when the
head/carriage is disconnected and power is on.
27-610 72MD Head/Carriage Removal and Replacement:
Voltage is still present·
at the power connector when the
head/carriage is disconnected and power is on.
27-615 72MD Head/Carriage Stepper Motor
Reinstallation: Voltage is still present at the power
connector when the head/carriage stepper motor is
disconnected and power is on.
27-620 72MD Head/Carriage Pulley and Clamp
Reinstallation: Voltage is still present at the power
comiector when th"e head/carriage is disconnected and
power is on.
27-690 72MD Index Sense PTX Output Service Check:
Voltage is still present at the power connector when the
drive motor power cable is disconnected and power is
on.
27 -800 72MD Driver Board Output to Picker/Cam
Stepper Motor Service Check: Parts of the driver board
become hot after continuous use.
27 -805 72MD Driver Board Output to Carriage Bed
Stepper Motor Service Check: Parts of the driver board
become hot after continuous use.
27 -845 72MD Carriage Bed Stepper Motor Control Card
Signal Output Check: Parts of the driver board become
hot after continuous use.
27 -850 72MD Picker/Cam Stepper Motor Control Card
Signal Output Check: Parts of the driver board become
hot after continuous use.
30-360 Une Plate Adjustment: Voltage is present on the
line plate from the telephone lines.
31-320 Une Plate Adjustment: Voltage is present on the
line plate from the telephone lines.
80-210 Power Distribution for ESD: Disconnect the line
cord before checking the screws holding the line cord.
99-041 Diagnostic Supervisors; Concurrent Maintenance:
If you are performing maintenance on the printer, have
the operator take the printer offline to 'prevent the
printer from being activated by an external source.
Safety 3

CE SAFETY PRACTICES CARD
4
CE SAFETY PRACTICES
All Customer Engineers are expected to take every safety
precaution possible and observe the following safety prac-
tices while maintaining I BM equipment:
1. You should not work alone under hazardous conditions
or around equipment with dangerous voltage. Always
advise your manager if you MUST work alone.
2. Remove all power, ac and dc, when removing or assem-
bling major components, working in immediate areas of
power supplies, performing mechanical inspection of pow-
er supplies, or installing changes in machine circuitry.
3. After turning off wall box power switch, lock it in the
Off position or tag it with a "Do Not Operate" tag, Form
229-1266. Pull power supply cord whenever possible.
4. When it is absolutely necessary to work on equipment
having exposed op'eraJing mechanical parts or exposed
live electrical
circuitry anywhere in the machine, observe
the following precautions:
a. Another person familiar with power off controls must
be in immediate vicinity.
b. Do not wear rings, wrist watches, chains, bracelets, or
metal cuff links.
c. Use only insulated pliers and screwdrivers.
d. Keep one hand in pocket.
e. When using test instruments, be certain that controls
are set correctly and that insulated probes of proper
capacity are used.
f. Avoid contacting ground potential (metal floor strips,
machine frames,
etc. I. Use suitable rubber mats, pur-
chased locally if necessary.
5. Wear
safety glasses when:
a. Using a hammer to drive pins, riveting, staking, etc.
b.
Power or hand drilling, reaming, grinding, etc.
c. Using
spring hooks, attaching springs.
d.
Soldering, wire cutting, removing steel bands.
e. Cleaning parts with solvents, sprays, cleaners, chemi-
cals, etc.
f.
Performing any other work that may be hazardous to
your eyes. REMEMBER - THEY ARE YOUR EYES.
6. Follow special safety instructions when performing special-
ized tasks, such as handling cathode ray tubes and extremely
high voltages. These instructions are outlined in CEMs
and the safety portion of the maintenance manuals.
7.
Do not use solvents, chemicals, greases, or oils that have
not been approved by IBM.
8. Avoid using tools or test equipment that have not been ap-
proved by IBM.
9. Replace worn or broken tools and test equipment.
10. Lift by standing or pushing up with stronger leg muscles-
thi') takes strain off back muscles. Do not lift any equip-
ment or parts weighing over 60 pounds.
11. After maintenance, restore all safety devices, such as guards,
shields, signs, and
grounding wires.
12. Each Customer Engineer is responsible to be certain that
no action on his part renders products unsafe or exposes
customer personnel to hazards.
13. Place removed machine covers in a safe out-of-the-way
place where no one can trip over them.
14. Ensure that all machine covers are in place before returning
machine to customer.
15. Always place CE tool kit away from walk areas where no
one can trip over it; for example, under desk or table.
16. Avoid touching moving mechanical parts when lubricating,
checking for play, etc.
17. When using stroboscope,
do not touch ANYTHING - It
may be moving.
18. Avoid wearing loose clothing that may be caught in ma-
chinery. Shirt sleeves must be left buttoned or rolled above
the elbow.
19. Ties must be tucked in shirt or have'a tie clasp (preferably
nonconductive) approximately 3 inches from end. Tie
chains are not recommended.
20. Before starting equipment, make certain fellow CEs and
customer personnel are not in a hazardous position.
21. Maintain good housekeeping in area of machine while per-
forming and after completing maintenance.
Knowing safety rules is not enough.
An unsafe act will inevitably lead to an accident.
Use good judgment - eliminate unsafe acts.
ARTIFICIAL RESPIRATION
General Considerations
1. Start Immediately -Seconds Count
Do not move victim unless absolutely necessary to remove.
from danger. Do not wait or look for help or stop to
loosen clothing, warm the victim, or apply stimulants.
2. Check Mouth for Obstructions
Remove foreign objects. Pull tongue forward.
3. Loosen Clothing -Keep Victim Warm
Take care of these items after victim is breathing by him-
self or when help is available.
4. Remain in Position
After victim revives, be ready to resume respiration if
necessary.
5. Call a
Doctor
Have someone summon medical aid.
6. Don't Give Up
Continue without interruption until victim is breathing
without help or is certainly dead.
Rescue Breathing for Adults
1. Place victim on his back immediately.
2. Clear throat of water, food, or foreign matter.
3. Tilt head back to open air passage.
4.
Lift jaw up to keep tongue out of air passage.
5. Pinch
nostrils to prevent air leakage when you blow.
6. Blow until you see chest rise.
7. Remove
your lips and allow lungs to empty.
8. Listen for snoring and gurglings -signs of throat obstruc-
tion.
9. Repeat mouth to mouth breathing 10-20 times a minute.
Continue rescue breathing until victim breathes for himself.
Thumb and
finger positions
Final mouth-to-
mouth position

01-000 Introduction to Maintenance
CONTENTS
I'~-',
U
01-005
Introduction
01-010
System/34 Maintenance Documents
01-020
Maintenance Analysis Procedures
(Volume A)
01-030
Maintenance Manual and Parts Catalog
"--'-,
(Volume B)
',-/)
01-032
Theory Diagrams Manual (Volume C)
01-034 Field Service Logics (Volume D)
01-070
MAP and Maintenance Manual Section
Numbering
01-080
MAP Numbering
01-090
Maintenance Manual Numbering
01-100
How to Use the System/34 MAPs and
Maintenance Manual
01-110
Rules for Using MAPs
01-120
Probing Information When Using MAPs
01-000
Introduction to Maintenance

01-005
INTRODUCTION
This section of the manual contains the following:
• A list of publications that you can use when
performing maintenance on the System/34
• A short description of the types of information found
in each publication
• Information on using the MAPs (maintenance analysis
procedures) along with this maintenance manual
when troubleshooting a system or device failure
01-010 SYSTEM/34 MAINTENANCE
DOCUMENTS
The following maintenance documents are shipped with
the system:
• IBM System/34 Maintenance Analysis Procedures
(MAPs) (Volume A)
• IBM System/34 5340 System Unit Maintenance
Manual,
SY31-0457 (Volume B)
• IBM System/34 5340 System Unit Parts Catalog,
5131-0632 (Volume B)
• IBM System/34 5340 System Unit Theory Diagrams
Manual, SY31-0458 (Volume C)
• IBM System/34 Field Service Logics (Volume D)
01-020 Maintenance Analysis Procedures
(Volume A)
Each MAP (maintenance analysis procedure) contains:
• A short description of its purpose
• A list of conditions under which it can be used
• A list of the logic cards that it tests
• Step-by-step procedures to follow when determining
the cause of a failure
MAPs are described in more detail in sections 01-100
and 01-110.
01-030
Maintenance Manual and Parts
Catalog (Volume B)
The maintenance manual contains information that you
will need when using MAPs. This information includes:
• Service checks
• Adjustments
• Removal and replacement procedures
• Second-level logic diagrams
• Error recording information
• A diagnostic service guide
• System installation instructions
The parts catalog is divided into three major sections:
• The Visual Index, containing complete figures of the
machine, with callouts that point to detailed figures.
• The Catalog Section, containing a visual detail figure
of assemblies and subassemblies.
• The Numerical Index, which i$ a numerical list of all
parts used in the machine, with references to other
figure(s) on which the part is found.
01-032
Theory Diagrams Manual (Volume C)
The theory diagrams manual contains text and logic
diagrams, that show how the System/34 operates. You
can also use this manual to analyze a machine failure
that the MAPs fail to isolate.
The list of abbreviations at the front, and the glossary at
the back of the theory diagrams manual give the
meanings of terms used in both the theory diagrams
manual and this maintenance manual.
01-0341 Field Service Logics (Volume D)
The FSL (field service logics) contain wiring diagrams
and pin, socket, board, and gate information that is used
when troubleshooting machine failures.
2 01·005
..... __ .','

01-070
MAP AND MAINTENANCE MANUAL
SECTION NUMBERING
The MAPs and the maintenance manual use the same
section numbers
for each section. For example, MAPs
and maintenance manual pages pertaining
to power start
with 05~ while those pertaining to 62EH disk drives start
with 09.
01-080
MAP Numbering
MAPs are numbered with a four-digit number. The first
two digits identify the MAP section. The last two digits
identify the MAP.
05 10
LThese
two digits identify MAP
number is in a section of MAPs.
These
two digits identify section 05
(the power section of MAPs).
91-090
Maintenance Manual Numbering
Each unit in the maintenance manual is identified with a
five-digit number. The first two digits identify the
section. The last three digits identify the paragraph
in
the section. Most references from MAPs to the
maintenance manual are written
as in the following
example: PERFORM THE DISK BRAKE SERVICE
CHECK (09-050).
Example: _
*09-050A
11 When used, this letter matches a letter on
a figure.
These three digits (the paragraph number)
identify the Brake Assembly Service
Check and Adjustment Procedure.
'----- These two digits identify this as section
09 (the 62EH disk drive section of the
maintenance manual).
'------ The letter C in this location would mean
that the
MAP is sending you to the
Theory-Diagrams Manual. The letter D
would mean that the MAP is sending you
to the Field Service Logics.
The MAPs (Volume A) and the
maintenance manual (Volume
B) do not
use this character position because most
references are between these two
volumes. When the reference is not easily
understood, the volume identification
letter is added.
Pages
in each section of the maintenance manual are
numbered consecutively, starting
with 1. These numbers
are used only when the manual is being printed; they
are not used
for any other purpose.
01-070
Introduction to Maintenance 3

01-100 HOW TO USE THE SYSTEM/34 MAPS
AND MAINTENANCE MANUAL
MAPs contain procedures that let you follow symptoms,
one step
at a time, until you find the cause of the
failure.
Most MAPs contain a series of questions that
can be answered yes or no. As these questions are
answered,
the MAP will identify the failing
field-replaceable unit (FRU). The
MAP may send you to
the maintenance manual for instructions on adjusting a
FRU,
or removing the FRU and installing a new one.
Use
MAPs to find the cause of errors recorded by
system hardware or diagnostic program failures and to
interpret error recording information. Each MAP is a
stand-alone document so you can enter a MAP at any
of its entry points.
System entry
MAPs contain general questions that send
you
to the area MAP for the machine function that is
failing. An area MAP contains specific questions that
send you to a unit MAP. The unit MAP contains
detailed questions
that enable you to identify the failing
FRU.
4 01-100
This maintenance manual contains instructions for
removing, checking, adjusting, and reinstalling most
field-replaceable units in the System/34. A MAP
usually sends you there to perform a specific action.
After completing the action, return to the MAP for
additional instructions.
Also use the index of this manual to find repair
procedures
for observed machine failures, such as a
broken part.
A short table
of contents at the front of the
maintenance manual lists
the number and title of each
section. Each section
of the maintenance manual
contains a detailed table of contents for that section.
i
//.-....."
'''--_ .. /
C
....--.....\
... -.'
(~:

From Any
MAP NTF or
Intermittent
Path
-~
t
Power Area
MAP 0500
!
Intermittent
Failure
Power Unit
Replacement MAP05XX
List 50XX
1 t
.!
62PC Processor and
62EH
Disk
Area
Miscellaneous Disk Area
MAP 1000
Area MAP 1500 MAP 0900
1 !
62PC
Processor and 62EH
. Disk Attach- Miscellaneous Disk Attach-
ment
Unit
Unit MAPS ment
Unit
MAP10XX
15XX-20XX
MAP 09XX
System Entry
MAP 0101
Start
t l t t
Data Communi-
System Printer System Printer Work Stations
cation Area
Area MAP 0700 Area
MAP 0800
Area MAP 1100
MAP 3100
(not MLCA)
!
L.
1
L-
L---
!
Work Station Data
Communi-
Printer Controller Printer Controller cation Unit
Unit MAP 07XX Unit MAP 08XX
Controller Unit
MAPs31XX-
MAP l1XX
39XX
t
IPL Function 5211 3262
5251,5252,
Failure Maintenance Maintenance
5256, or 5225
MAP03XX
Library Library
Maintenance
Library
.!
.! 1
11
-1.
~
Operator Diskette Diskette
CE Panel Area
Panel Area
Area Area
MAP 1300 MAP 2100
MAP 2300 MAP 2100
(level 1) (level 2)
! 1 I I
+
Diskette 33FD
Diskette
CE Panel Unit
Operator Diskette
53FD Unit
MAP 13XX
Panel Unit
MAP
MAP
MAP 21XX
23XX (level 1) 23XX (level 1)
27XX (level 2) 27XX (level 2)
From Any MAP
Error Recording
Index 80-000
Error Log
MAP8XXX
MLCA
MAPs30XX,
1701-171E
Diskette
72MD
Unit
MAP 27XX
01-110
Introduction to Maintenance 5
..

01-110 RULES FOR USING MAPS
You will usually be using MAPs or MAP diagnostic
integration (MOl) tests to diagnose a failure with
symptoms that remain constant. MAPs and MOl tests
used in this way should identify a failing
field-replaceable unit (FRU).
If the failure symptoms do not remain constant, you
should still use the MAPs and MOl tests when
attempting to isolate the problem. If the MAPs and MOl
tests fail to find the problem, perform the following:
• Reseat the cards and cables
• Use the error recording procedures (Section 80-000)
• Use the intermittent failure replacement list (MAP
5000)
When using a MAP or running an MOl test, the MAP or
MOl test always describes how to prepare the machine
or operate the switches needed to answer the MAP
questions or run the tests. Additional information
describing the purpose of the MAP or MOl test is also
given.
You should observe the following procedures when
using the System/34 MAPs or MOl tests:
1. Always analyze any unusual noise or distinct errors
before going through the MAPs by using the table
of contents or index to find information that
pertains to the symptom, or, use the MAP for the
specific part of the machine that is failing. If you
cannot determine the cause of the failure from
these sources of information, start at the system
entry MAP for a detailed analysis of the symptom.
2.
3.
4.
For other system failures, or failures reported by
the customer, you should normally start at MAP
0101.
Always start using a device MAP or MOl test at
entry point A unless you are instructed not to, and
check to see that the START conditions are met.
Always power down before removing or installing
a fuse, cable, or card, unless you are instructed
not to.
5. When a MAP indicates that a card or cable is bad,
do the following:
a. Inspect the card and socket, then reseat the
card and run the test that failed.
b. Remove the bad card or cable, install a good
one, and run the test that failed.
c. If the card has top card connectors, reverse the
connectors end for end and run the test that
failed to see if the symptom changes.
d. Swap cards in the system unit to see if the
symptom changes. Card swapping information
is in the Field Service Logics on page AC5OO.
e. Install new cards for each card in the LOGIC
CARDS TESTED list at the start of the MAP or
MOl test.
6. Always probe all lines indicated, observing the
status of each line, before answering the question
that follows in the MAP or MOl test, unless you
are instructed to perform some other action.
7.
Names of all switches and indicators are shown in
MAPs in the same way that they· appear on the
panel itself.
8. Hexadecimal numbers are shown as hex AB23 or
X'AB23'.
9. An X inside single quotation marks indicates a
don't care position. For example, the second X in
X'X54B' could represent any hexadecimal number.
10. After you diagnose and repair a problem, run the
failing MAP or MOl test again to verify that the
problem is corrected.
01-120 PROBING INFORMATION WHEN USING
MAPS
Use the General Logic Probe II tool, (IBM part 453212)
to measure signal levels when the MAPs instruct you to.
This probe is used instead of an oscilloscope for normal
System/34 maintenance. Detailed information on using
and maintaining the'probe is in the IBM General Logic
Probe
/I Manual, SY27-0127, and in paragraphs 02-015
through 02-045 of this manual.
6 01-120
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CONTENTS
02-010
02-015
02-020
02-025
02-035
02-040
02-045
Introduction
Probing Information
How to Prepare the Probe for Use
Input Voltage Levels of the Probe
What the Probe Lights Mean
Machine Voltage Levels
How to Check the Probe for Correct
Operation
02-070 Features
02-080 Special Tools
02-000 Reference Information
02-000 Reference
Information

02-010 INTRODUCTION
The general reference information in this section
includes the following:
• Instructions on how to test and use the IBM General
Logic Probe II.
Signal levels used in System/34 logic circuits.
• Locations of optional features on the System/34.
• Additional information needed for servicing the
System/34.
02-015
PROBING INFORMATION
When using the MAPs, use the General Logic Probe II
(IBM part 453212) to determine if a signal level is Up or
Down. Use this probe instead of an oscilloscope for
most System/34 maintenance. Additional information
about using and maintaining this probe is in the IBM
General Logic Probe II Manual, SY27 -0127.
PIN 5500900
MULTI ~
MST 214 -
MST 1
LATCH
UP~
NONE. -
DOWN
GATE REF
'1.4V~
GND -
··1.3V
GATING
02-020 How to Prepare the Probe for Use
To make the probe ready for use, do the following:
• Set the TechnolQgy switch to the Multi position.
• Set the Latch switch to the None position.
• Set the Gate Ref switch to +1.4V.
• Attach the red lead to any convenient +5V pin (003).
• Attach the black lead
to any convenient ground pin
(008).
02-025 Input Voltage Levels of the Probe
When you use the General Logic Probe II with the
Technology switch set
to Multi, you can probe voltage
levels as shown in the figure that follows.
General Logic Probe II Input Voltage Ranges
MPUL (+60V) (most positive up level)
LPUL (+2.16V ±.180V) (least positive up level)
(most positive down level) MPDL
(+.95V ±.180V)
OV
(least positive down level) LPDL (·60V)
Indicating Lights
Region Up
Down
I
ON
OFF
OFF OFF
OFF
ON
VTL and Dutchess Input Voltage Ranges
02-035
What the Probe Lights Mean
The probe lights can have different meanings that rely
on the condition of the lights. Some of the possible
conditions and their meanings are shown in the table
that follows.
2 02-010
i
\
...........

/
( -,,\
~)
o
What the Probe Lights Mean
Condition Meaning
UP light OFF The
point being probed is not at
DOWN light OFF either
an up logic level or a
down logic level,
or the power
cable of the General Logic Probe
II is not connected correctly.
UP light ON The
point being probed is at
DOWN light OFF the up level (1).
UP light OFF The
point being probed is at
DOWN light
ON
the down level (0)".
UP light ON The
point being probed is pUlsing
DOWN light
ON
at afrequency of more than
30 pulses per second.
UP light Flashing The
point being probed is pUlsing
DOWN light Flashing at a frequency
of less than 30
pulses per second.
UP light Flashing The
point being'probed has a
DOWN light
ON
series of narrow positive pulses
with a frequency of less than
30 pulses per second.
UP light ON The
point being probed has a
DOWN light
Flashing
series of narrow negative pulses
with afrequency of less than
30 pulses per second.
02-040 Machine Voltage Levels
System/34 uses mainly Dutchess and VTL logic
technology. Both
of these technologies have the same
input and output levels. The input and output voltage
levels
for these technologies range from O.OV to +5.5V
as shown.
Input Levels Output Levels
MPUL +5.5V (most positive up level)
+5.5V __ _
LPUL +2.0V (least positive up level)
+2.4V ___ ~
MPUL (most positive up level)
LPUL (least positive up level)
(most positive down level)
MPDL +O.BV
(most positive down level)
MPDL +O.4V
(least positive down level)
LPDL O.OV
(least positive down level)
LPDLO.OV
VTL and Dutchess INPUT/OUTPUT Requirements
VTL Dutchess
02-040 Reference Information 3
•