IBM RT PC 10 Owner's manual

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Personal Computer
Hardware Reference
Library
IBM RT PC
Model 10 Hardware
Maintenance and Service
59X9319

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Personal Computer
Hardware Reference
Library
IBM RT PC
Model 10 Hardware
Maintenance and Service

NOTICE TO USER
The Diagnostic Diskettes (Diag 1and Diag 2) referred to in this manual are
located in the IBM
RT PC Problem Determination Guide binder.
First Edition November 1985
Changes are made periodically to the information herein; these changes will be incorporated in new editions of this publication.
References in this publication to IBM products, programs,
or services do not imply that IBM intends to make these available in all countries
in which IBM operates. Any reference to an IBM program product in this publication
is not intended to state or imply that only IBM's
program product may be used. Any functionally equivalent program may be used instead.
International Business Machines Corporation provides this manual "as is," without awarranty of any kind, either expressed
or implied,
including, but not limited to, the implied warranties of merchantability and fitness for aparticular purpose. IBM may make improvements
and/or changes in the product(s) and/or the program(s) described in this manual at any time.
Products are not stocked at the address given below. Requests for copies
of this product and for technical information about the system
should be made to your authorized IBM RT PC Model 10 dealer.
Areader's comment form
is provided at the back of this publication. If the form has been removed, address comments to IBM
Corporation, Department 998, 11400 Burnet Road, Austin, Texas 78758. IBM may use or distribute whatever information you supply in
any way it believes appropriate without incurring any obligation to you.
©Copyright International Business Machines Corporation 1985

Federal Communications Commission (FCC) Radio Frequency
Interference Statement
Warning: This equipment has been tested and found to comply with
the limits for aClass Acomputing device pursuant to Subpart Jof
Part 15 of FCC Rules, which are designed to provide reasonable
protection against such interference when operated in acommercial
environment. Operation of this equipment in aresidential 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.
This equipment generates, uses, and can radiate radio frequency energy. If
not installed and used according to the instruction manual, the equipment
may cause interference to radio communications. It has
been tested and
found to comply with the limits for aClass Acomputing 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 aresidential 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.
If this equipment causes interference to radio communications, which can be
determined by turning the equipment off and on, the user
is encouraged to
try to correct the interference
by one or more of the following measures:
•Reorient the receiving antenna.
•Relocate the equipment with respect to the receiver.
•Move the equiplnent away from the receiver.
•Plug the computer into adifferent outlet, so that the computer and
receiver are
on different branch circuits.
•Ensure that card mounting screws, attachment connector screws,
and
ground wires are tightly secured.
iii

iv Service Manual
•Ensure that card slot covers are
in place when no card is installed.
• If peripherals not offered by IBM are used with this equipment, it is
suggested to use shielded, grounded cables with in-line filters, if
necessary.
If necessary, consult your dealer service representative for additional
suggestions.
The manufacturer
is not responsible for any radio or television interference
caused
by unauthorized modifications to this equipment. It is the
responsibility of the user to correct such interference.

Safety
This manual contains "DANGER" notices on pages 4-22 and 4-23. If
desired, translate the text and write your own words on the pages.
This manual contains a"Safety Inspection Guide"
on the following pages.
The Safety Inspection Guide is used by the IBM Service Representative.
The IBM
RT PC Model 10 System Unit contains no hazardous voltages or
safety grounds outside the power supply. The power supply is asealed unit
and is not field serviceable.
Safety v

Safety Inspection Guide
Use this guide to identify unsafe conditions. Use good judgment to identify
potential safety hazards not covered by this guide.
If unsafe conditions are
present, determine how serious the hazards are and whether you should
continue before correcting the problem.
Do the following checks:
1. Check the covers for damage or alterations that expose the internal
parts of the system unit or for sharp edges.
2. Check the covers for proper fit to the system unit. They should be in
place and secure.
vi Service Manual

3. Set the power switch on the system unit to Off.
4. Remove the rear cover (page 4-10).
5. Remove the
top cover (page 4-12).
6. Check for alterations or attachments. If there are any, check for
obvious safety hazards such as
broken wires, sharp edges, or broken
insulation.
7. Check the internal cables for damage.
8. Check for dirt, water, and any other contamination within the system
unit.
Safety
vii

viii Service Manual
9. Check the voltage label on the rear of the system unit to ensure it
matches the voltage at your outlet.
10. Check the external power cable for damage.
11. With the external power cable connected to the system unit, check for
less than 0.1 ohm resistance between the ground lug
on the external
power cable plug and the metal frame
of the power supply.
12. Install the top cover (page 4-13).
13. Install the rear cover (page 4-11).
Metal
Frame

About this Book
This manual provides service information about the IBM RT PC Model 10
System Unit, adapters, and attached devices
that do not have their own
service information. This manual does
not contain service information
about attached printing devices.
Users of this manual should have training
on the IBM RT PC Model 10.
This manual
is divided into sections to make the information easier to find.
Section
1, "System Description" contains abrief description of the system
unit, keyboard, and display.
Section 2, "Diagnostics" contains descriptions of the diagnostic programs,
utilities, and the service request number.
Section 3, "Problem Isolation Charts" contains the service procedures used
to isolate failures to afield-replaceable unit.
Section 4, "Removal and Replacement Procedures" contains the locations,
removal procedures, and replacement procedures. These procedures may
direct you to another section for specific details such as switch settings,
jumper settings,
or terminator resistor settings.
Section 5, "Base System Unit" contains adescription, specifications, cabling
diagrams, adata flow diagram, and parts information for the base
components of the system unit.
Section 6, "System Memory Options" contains adescription, specifications,
and parts information for each system memory option.
About this Book
ix

xService Manual
Section 7, "Diskette Drive" contains adescription, specifications,
terminator resistor setting, and parts information for the diskette drive.
Section 8, "Fixed-Disk Drive" contains adescription, specifications,
terminator resistor setting, and parts information for the fixed-disk drive.
Section 9, "Adapters" contains adescription, specifications, switch
or
jumper settings, and parts information for each adapter used in the system
unit.
Section 10,
"User Input Devices" contains adescription, specifications, a
removal procedure, areplacement procedure, and parts information for each
type device used to input data or commands.
Section 11, "Displays" contains adescription, specifications, control
adjustment procedures, and parts information for each IBM display used
with the IBM
PC RT Model 10.
Section 12,
"Tape Drive" contains adescription, specifications, and parts
information for the tape drive used with the IBM
PC RT Model 10.
Appendix A, "Tool Requirements" contains descriptions of the tools needed
to service the IBM
PC RT Model 10.
Appendix B,
"SRA to FRU Cross-Reference List" contains alist of each
Service Repair Action (SRA) number and the part number and part name of
the field-replaceable unit it represents. This list is in SRA number order.
AReader's Comment
Form and Book Evaluation Form are provided at the
back of this book. Use the Reader's Comment Form at any time to give
IBM information that may improve the book. After you become familiar
with the book, use the Book Evaluation Form to give IBM specific feedback
about the book.

Related Publications
• IBM RT PC Guide to Operations describes the Model 10, Model 20, and
Model 25 system units, the displays, keyboard, and other devices that
can be attached. This guide also includes procedures for operating the
hardware and moving the Model 10, Model 20, and Model 25 system
units.
• IBM RT PC User Setup Guide provides instructions for setting up and
connecting devices to the system units. This
book also gives procedures
for testing the setup and for installing the AIX Operating System.
• IBM RT PC Options Installation provides instructions for installing
optional adapters in Model 10, Model 20, and Model 25 and installing
fixed-disk and diskette drives in Model 20 and Model 25.
• IBM RT PC Problem Determination Guide provides instructions for
running diagnostic routines to locate and identify hardware problems.
Also includes problem determination for software. Two high-capacity
(1.2MB) diskettes containing the IBM
RT PC diagnostic routines are
included.
• IBM RT PC Hardware Technical Reference is atwo-volume set.
Volume Idescribes how the system unit operates, including
1/0
interfaces, serial ports, memory interfaces, and CPU interface
instructions. Volume II describes adapter interfaces for optional
devices and communications and includes information about IBM
Personal Computer family options and the adapters supported
by Model
10, Model 20, and Model 25. (Available optionally)
• IBM 6157 Streaming Tape Drive Setup and Operating Instructions
provides instructions for setting up and operating the IBM 6157
Streaming Tape Drive. This pamphlet also describes procedures for
cleaning the recording head
of the tape drive and handling tape
cartridges.
About this Book
xi

•Setup Instructions for the IBM PC Network Short, Medium, and Long
Distance Kits provides instructions for setting up and connecting the
short, medium, and long distance expanders.
•Setup Instructions for the IBM PC Network Transformer and Translator
Unit provides instructions for setting up and connecting the transformer
and translator.
Ordering Additional Copies of This Book
To order additional copies of this publication, use either of the following
sources:
•To order from your IBM representative, use Order Number SV21-8026.
•To order from your
mM dealer, use Part Number 6280745.
Abinder and wrap plugs are included with the order.
xii Service Manual

Contents
Section 1. System Description 1-1
About this Section 1-3
Introduction 1-4
System Unit 1-4
Keyboard 1-5
Display 1-6
Section 2. Diagnostics 2-1
About this Section 2-3
Introduction to Diagnostics ................................
.. 2-4
Power-On Self-Test 2-7
Standalone Diagnostic Program Descriptions 2-8
Loading the Diagnostic Diskette 2-8
Key Descriptions 2-9
Diagnostic Routines 2-10
Utilities 2-12
Advanced Diagnostic Routines 2-15
Installation Verification 2-16
Service Request Number Description 2-17
Source Number 2-18
Service Repair Action Number 2-19
Section 3. Problem Isolation Charts 3-1
About this Section 3-3
Introduction 3-4
Start of Call PIC 3-5
Problem Determination Procedure 3-22
Memory Expansion Option PIC 2100 3-62
Power Supply PIC 8800 3-68
POST Errors 03
or 05 PIC 9810 3-79
POST Errors 00 or 04 PIC 9820 3-87
POST Errors
11 or 12 PIC 9830 3-92
POST Error 23 PIC 9840 3-96
Contents xiii

xiv Service Manual
Invalid Display Data PIC 9850 3-100
Undetermined Problem PIC 9860 . .
.. 3-104
Service Repair Action Number Chart 3-109
Section 4. Removal and Replacement Procedures 4-1
About this Section 4-3
System Unit Locations 4-4
Front View With Covers 4-4
Rear View Without Rear Cover 4-5
Top View Without Covers 4-6
System Board 4-7
Handling Static-Sensitive Devices 4-8
Removal and Replacement Procedures 4-10
Rear Cover Removal 4-10
Rear Cover Replacement 4-11
Top Cover Removal 4-12
Top Cover Replacement 4-13
Processor, Floating-Point,
or System Memory Removal 4-14
Processor, Floating-Point,
or System Memory Replacement 4-15
Adapter Removal 4-16
Adapter Replacement 4-18
Attached Device Removal 4-20
Attached Device Replacement 4-21
Battery Removal 4-22
Battery Replacement 4-23
Diskette Drive Removal 4-24
Diskette Drive Replacement 4-26
Fixed-Disk Drive Removal 4-28
Fixed-Disk Drive Replacement 4-30
Keylock Removal 4-32
Keylock Replacement 4-33
Operator Panel Board Removal 4-34
Operator Panel Board Replacement 4-35
Cooling
Fan Assembly Removal 4-36
Cooling
Fan Assembly Replacement 4-37
Power Supply Removal 4-38
Power Supply Replacement 4-40
System Board Removal 4-42
System Board Replacement 4-46

Section 5. Base System Unit 5-1
About this Section 5-3
Base System Unit (6151) 5-4
Specifications 5-4
Removal and Replacement Procedures 5-4
Processor Board 5-5
Floating-Point Board 5-5
System Board 5-6
Data Flow Diagram .................................
.. 5-7
Power Distribution Diagram 5-8
Internal Signal Cabling Diagram 5-9
Parts Information 5-10
Section 6. System Memory Options 6-1
About this Section 6-3
System Memory Option Chart 6-4
1MB Memory Expansion Option 6-5
Specifications 6-5
Removal and Replacement Procedures 6-5
Parts Information 6-6
2MB Memory Expansion Option 6-7
Specifications 6-7
Removal and Replacement Procedures 6-7
Parts Information 6-8
Section 7. Diskette Drive 7 -1
About this Section 7-3
Personal Computer AT High Capacity Diskette Drive 7-4
Specifications 7-4
Removal and Replacement Procedures 7-4
Terminator Resistor 7-5
Parts Information 7-6
Section 8. Fixed-Disk Drive 8-1
About this Section 8-3
Fixed-Disk Drive Type R40 8-4
Specifications 8-4
Removal and Replacement Procedures 8-4
Terminator Resistor 8-5
Contents
xv

xvi Service Manual
Parts Information 8-6
Section 9. Adapters 9-1
About this Section 9-4
Personal Computer
AT Coprocessor Option 9-5
Specifications 9-5
Removal and Replacement Procedures 9-5
Parts Information 9-6
AT 512
KB Memory Expansion Option 9-7
Specifications 9-7
Removal and Replacement Procedures
9- 7
Switch Settings 9-8
Parts Information 9-9
Personal Computer
AT Fixed-Disk and Diskette Drive Adapter 9-10
Specifications 9-10
Removal and Replacement Procedures 9-10
Jumper Settings 9-11
Parts Information 9-12
ffiM Monochrome Display and Printer Adapter 9-13
Specifications 9-13
Removal and Replacement Procedures 9-13
Parts Information 9-14
Advanced Monochrome Graphics Display Adapter 9-15
Specifications 9-15
Removal and Replacement Procedures 9-15
Parts Information 9-16
Enhanced Graphics Adapter 9-17
Specifications 9-17
Removal and Replacement Procedures 9-17
Switch and Jumper Settings 9-18
Parts Information 9-19
4Port Asynchronous RS232C Adapter 9-20
Specifications 9-20
Removal and Replacement Procedures 9-20
Switch Settings 9-21
Parts Information 9-22
4Port Asynchronous RS422 Adapter 9-23
Specifications 9-23
Removal and Replacement Procedures 9-23
Switch Settings 9-24

Parts Information 9-25
ffiM
PC Network Adapter (5178) 9-26
Specifications 9-26
Removal and Replacement Procedures 9-26
Jumper Settings ......................................
.. 9-27
Parts Information 9-28
Personal Computer
AT Serial/Parallel Adapter 9-30
Specifications 9-30
Removal and Replacement Procedures 9-30
Jumper Module Settings 9-31
Parts Information 9-32
Streaming Tape Drive Adapter 9-33
Specifications 9-33
Removal and Replacement Procedures 9-33
Parts Information 9-34
3278/79 Emulation Adapter 9-35
Specifications 9-35
Removal and Replacement Procedures 9-35
Parts Information 9-36
Section 10. User Input Devices 10-1
About this Section .............•......................... 10-3
Keyboard 10-4
Specifications 10-4
Removal Procedure 10-4
Replacement Procedure 10-4
Parts Information 10-5
Mouse 10-6
Specifications 10-6
Removal Procedure 10-6
Replacement Procedure 10-6
Parts Information 10-7
Section 11. Displays 11-1
About this Section 11-3
ffiM Personal Computer Display (5151) 11-4
Specifications 11-4
Removal and Replacement Procedures 11-4
Test Patterns 11-5
Parts Information 11-7
Contents
xvii

xviii Service Manual
Advanced Monochrome Graphics Display (6153) 11-9
Specifications 11-9
Removal and Replacement Procedures 11-9
Parts Information 11-10
Enhanced Color Display (5154) 11-11
Specifications 11-11
Removal and Replacement Procedures 11-11
Adjustments 11-12
Test Patterns 11-14
Parts Information 11-16
Section 12. TapeDrive 12-1
About this Section 12-3
Streaming Tape Drive (6157) 12-4
Specifications 12-4
Removal and Replacement Procedures 12-4
Parts Information 12-5
Appendix A. Tool Requirements A-I
Wrap Plugs A-I
Module Puller A-4
Multimeter A-4
Appendix B. SRA to FRU Cross-Reference List B-1
Glossary . X-I
Index X-7

Section 1. System Description
System Description 1-1