IBM 6150 Owner's manual

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IBMRTPC
6150 System Unit
Hardware Maintenance
and Service
Personal Computer
Hardware Reference
Library

Second Edition September 1986
This is a major revision of and obsoletes the first edition of the mM RT PC Model 20 and 25 Hardware Maintenance and Service manual.
Changes are made periodically to the information herein; these changes will be incorporated in new editions of this publication.
References
in this publication to mM products, programs, or services do not imply that mM intends to make these available in all countries
in which
mM operates. Any reference to an mM licensed products in this publication is not intended to state or imply that only mM's
licensed product may be used. Any functionally equivalent program may be used instead.
International Business Machines Corporation provides this manual "as is," without a warranty
of any kin~ either expressed or implied, including,
but not limited to, the implied warranties
of merchantability and fitness for a particular purpose. mM 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 mM RT Personal Computer dealer.
A reader's comment form is provided at the back
of this publication. If the form has been removed, address comments to mM
Corporation, Department 998, 11400 Burnet Road, Austin, Texas 78758. mM 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 1986

Federal Communications Commission (FCC) Radio Frequency
Interference Statement
Warning: This equipment has been tested 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.
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 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.
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 equipment away from the receiver.
• Plug the computer into a different 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 6150 System Unit contains no hazardous voltages or safety
grounds outside the power supply. The power supply is a sealed unit
and it
is
not field serviceable.
Safety v

Safety Inspection Guide
vi Service Manual
Use this guide to identify unsafe conditions. Use good judgment to identify
potential safety hazards not
~overed 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.
3. Gently rock the system unit from side to side to determine if it
is steady.
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4. Set the power switch on the system unit to Off.
5. Do the "Side Cover Removal" on page 4-14.
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.
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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
0.1 ohm or less resistance between the ground lug on the external power
cable plug and the metal frame.
12.
Do the "Side Cover Replacement" on page 4-15.

About this Book
This manual provides service information about the IBM 6150 System Unit,
adapters, and attached devices that do not have their own service
information. This manual does not contain service information about
attached printing and plotting devices.
Users
of this manual should have training on the IBM 6150 System Unit.
This manual is divided into sections to make the information easier to find.
A three
or four-digit code is used in the page numbering of some sections to
make future updating easier.
Section 1, "System Description" contains a brief 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 a field-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 a description, specifications, cabling
diagrams, data flow diagram, and parts information for the base components
of the system unit.
Section 6, "System Memory Options" contains a description, specifications,
and parts information for each system memory option.
About this Book
ix

x Service Manual
Section 7, "Diskette Drives" contains a description, specifications,
terminator resistor settings, and parts information for each type
of diskette
drive.
Section 8, "Fixed-disk Drives" contains a description, specifications,
terminator resistor settings, and parts information for each type
of
fixed-disk drive.
Section 9, "Adapters" contains a description, specifications, switch or
jumper settings, and parts information for each adapter used in the system
unit.
Section 10, "User Input Devices" contains a description, specifications, a
removal procedure, a replacement procedure, and parts information for each
type device used
to input data or commands.
Section 11, "Displays" contains a description, specifications, control
adjustment procedures, and parts information for each IBM display used
with the IBM 6150 System Unit.
Section 12,
"Tape Drive" contains a description, specifications, and parts
information for the tape drive used with the IBM 6150 System Unit.
Appendix A, "Tool Requirements" contains descriptions of the tools needed
to service the IBM 6150 System Unit.
Appendix B, "SRA to FRU Cross-Reference List" contains a list 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.
Appendix C.
"Error Log Information" provides an overview of the Error
Log reports, commands, and command examples.
A Reader'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.

TNL SN32-9004 (August 87) to 75X0152
Related Publications
• IBM RT PC Guide to Operations describes the IBM 6150 and IBM
6151 System Units, the displays, keyboard, and other devices that
can be attached. This guide also includes procedures for operating the
hardware and moving the IBM RT PC System.
• 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. (Packaged with IBM RT PC Options Installation)
• IBM RT PC Options Installation provides instructions for choosing
the correct switch settings, installing optional adapters, installing
fixed-disk drives, and installing diskette drives in the IBM 6150 and
IBM
6151 System Units. (Packaged with IBM RT PC User Setup
Guide)
• IBM RT PC Problem Determination Guide provides instructions for
running diagnostic routines to locate and identify hardware problems.
A problem determination guide for software and two high-capacity
(1.2MB) diskettes containing the IBM RT PC diagnostic routines are
included.
• IBM RT PC Hardware Technical Reference is a two-volume set.
Volume I describes how the system unit operates, including I/O
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 the
IBM
RT PC System. (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

TNL SN32-9004 (August 87) to 75XO 152
• 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.
• IBM 5085 Graphics Processor Maintenance Information Manual,
SY66-0101
• IBM 5081-1,2 Display Maintenance Information Manual, SY66-0102
• IBM 5080 Attachment Adapter Manual
Ordering Additional Copies of This Book
xii Service Manual
To order additional copies of this publication, use either of the following
sources:
• To order from your IBM representative, use Order Number
SV21-8025.
•
To order from your IBM dealer, use Part Number 08F3465.
A binder and wrap plugs are included with the order.

TNL SN20-9843 (03-27-87) to 75X0152 or 75X0166
Contents
Section 1. System Description .......................... 1-1
About this Section ........................................ 1-3
Introduction
............................................. 1-4
Section 2. Diagnostics ................................ 2-1
About this Section ........................................ 2-3
Introduction to Diagnostics
.................................. 2-4
Power-On Self-Test ....................................... 2-6
Standalone Diagnostic Program Descriptions
.................... 2-8
Service Request Number Description
......................... 2-19
Section 3. Problem Isolation Charts ...................... 3-1
About this Section ........................................ 3-3
Introduction
............................................. 3-4
Start
of Call PIC 0010 ................................ 3-0010-1
Service Repair Action Number Chart PIC 0020 ............. 3-0020-1
Problem Determination Procedure PIC 0030
............... 3-0030-1
POST Indicator Chart PIC
0040 ........................ 3-0040-1
Noise Problem PIC 0050 .............................. 3-0050-1
Unresolved Problem PIC 0060
.......................... 3-0060-1
Application Only Problems PIC 0080 ..................... 3-0080-1
Intermittent Problems PIC 0090 ......................... 3-0090-1
Memory Expansion Option PIC 2100 .................... 3-2100-1
IBM PC Enhanced Graphics Adapter Memory PIC 4200 ..... 3-4200-1
IBM 5151 Personal Computer Display PIC 5400 ............ 3-5400-1
IBM 5154 Enhanced Color Graphics Display PIC 5800 ...... 3-5800-1
IBM 6154 Advanced Color Display PIC 5900 .............. 3-5900-1
IBM 6153 Advanced Monochrome Graphics Display PIC 6000 3-6000-1
IBM 5081 Display PIC 6100 ........................... 3-6100-1
IBM 6155 Extended Monochrome Graphics Display PIC 6200 . 3-6200-1
Power Supply PIC 8800
............................... 3-8800-1
POST Errors 03
or 05 PIC 9810 ........................ 3-9810-1
POST
Error 23 PIC 9840 .............................. 3-9840-1
(3/87) Contents xiii

TNL SN20-9843 (03-27-87) to 75X0152 or 75X0166
Undetermined Problem PIC 9860 ........................ 3-9860-1
POST Errors 5c PIC 9870
............................. 3-9870-1
Section 4. Removal and Replacement Procedures ............ 4-1
About this Section ........................................ 4-3
System Unit Locations ..................................... 4-4
Handling Static-Sensitive Devices
............................. 4-8
Removal and Replacement Procedures
........................ 4-10
Section 5. Base System Unit ............................ 5-1
About this Section ........................................ 5-3
Base System Unit
......................................... 5-4
RT PC Processor Board ................................ 5-001-1
RT PC Advanced Processor Board ........................ 5-002-1
RT PC Floating-Point Board ............................ 5-004-1
RT PC Advanced Floating-Point Board .................... 5-005-1
Section 6. System Memory Options ...................... 6-1
About this Section ........................................ 6-3
RT PC 1MB Memory Expansion Option ................... 6-008-1
RT PC 2MB Memory Expansion Option ................... 6-010-1
RT PC 4MB Memory Expansion Option ................... 6-012-1
RT PC 4MB Fast Memory Expansion Option ............... 6-013-1
RT PC 8MB Fast Memory Expansion Option ............... 6-016-1
Section 7. Diskette Drives ............................. 7-1
About this Section ........................................ 7-3
Handling a Diskette Drive
.................................. 7-4
mM AT High Capacity Diskette Drive ............... . . . . .. 7-100-1
mM AT Dual-Sided Diskette Drive ....................... 7-102-1
Section 8. Fixed-Disk Drives ........................... 8-1
About this Section ........................................ 8-3
Handling a Fixed-Disk Drive
................................ 8-4
Fixed-Disk Drive Type R40
............................. 8-120-1
Fixed-Disk Drive Type R70 ............................. 8-128-1
Fixed-Disk Drive Type
E70 ............................. 8-130-1
Section 9. Adapters ........•......................... 9-1
xiv Service Manual

TNL SN20-9843 (03-27-87) to 75X0152 or 75X0166
About this Section ........................................ 9-6
mM AT 512 KB Memory Expansion Option ................ 9-019-1
RT PC AT Coprocessor Option .......................... 9-023-1
IBM AT Fixed-Disk and Diskette Drive Adapter ............. 9-027-1
RT PC ESDI Magnetic Media Adapter .. . . . . . . . . . . . . . . . . . .. 9-031-1
RT PC Extended ESDI Magnetic Media Adapter. . . . . . . . . . . .. 9-032-1
IBM Monochrome Display and Printer Adapter .............. 9-040-1
IBM PC Enhanced Graphics Adapter .-..................... 9-042-1
RT PC Advanced Monochrome Graphics Display Adapter ..... 9-045-1
RT PC Advanced Color Graphics Display Adapter ........... 9-048-1
RT PC Extended Monochrome Graphics Display Adapter. . . . .. 9-051-1
IBM IBM Megapel Display Adapter ....................... 9-053-1
RT PC 4-Port Asynchronous RS-232C Adapter (Buffered) .... 9-056-1
RT PC 4-Port Asynchronous RS-422A Adapter (Buffered) .... 9-059-1
mM AT Serial/Parallel Adapter .......................... 9-061-1
mM PC Network Adapter .............................. 9-063-1
RT PC Multiprotocol Adapter ........................... 9-065-1
RT PC Baseband Adapter .............................. 9-067-1
mM PC 3278/79 Emulation Adapter ..................... 9-069-1
IBM Token-Ring Network RT PC Adapter ................. 9-071-1
RT PC Small Computer Systems Interface Adapter ........... 9-073-1
RT PC Streaming Tape Drive Adapter ..................... 9-086-1
RT PC 5080 Peripheral Adapter. . . . . . . . . . . . . . . . . . . . . . . . .. 9-092-1
RT PC 5080 Attachment Adapter ........................ 9-095-1
RT PC S/370 Host Interface Adapter ..................... 9-097-1
Section 10. User Input Devices ........................ 10-1
About this Section ....................................... 10-3
Keyboard .......................................... 10-140-1
Mouse ............................................. 10-143-1
IBM 5083 Tablet .................................... 10-145-1
mM 5085 Dials Feature ............................... 10-146-1
IBM 5085 Lighted Program Function Keyboard Feature ...... 10-147-1
Section 11. Displays ................................. 11-1
About this Section ....................................... 11-3
mM 5081 Color-Graphics Display ....................... 11-152-1
mM 5151 Personal Computer Display .................... 11-154-1
IBM 5154 Enhanced Color Display
...................... 11-155-1
IBM 6153 Advanced Monochrome Graphics Display
........ 11-161-1
(3/87) Contents xv

TNL SN20-9843 (03-27-87) to 75X0152 or 75X0166
xvi Service Manual
mM 6154 Advanced Color Display ...................... 11-162-1
mM 6155 Extended Monochrome Graphics Display ......... 11-163-1
Section 12. Tape Drive ............................... 12-1
About this Section ....................................... 12-3
mM 6157 Streaming Tape Drive ........................ 12-170-1
Appendix A. Tool Requirements ......................... A-1
Wrap Plugs for the Service Representative ..................... A-I
Wrap Plugs for the Customer ............................... A-5
Module Puller
........................................... A-9
Multimeter
............................................. A-9
Appendix B. SRA to FRU Cross-Reference List ............ B-1
Appendix C. Error Log Information
...................... C-1
Error Log Reports ....................................... C-2
The Error Report Command
.............. . . . . . . . . . . . . . . . . .. C-4
Error Log Command Examples
............................. C-6
Glossary •...............•.......................... X-1
Index
...•.........••..•............................ X- 7

Section 1. System Description
System Description 1-1

CONTENTS
About this Section ............................................................ 1-3
Introduction
................................................................. 1-4
System Unit
............................................................... 1-4
Keyboard
................................................................. 1-5
Display
................................................................... 1-6
1-2 Service Manual

Trademark offfiM
About this Section
This section contains a brief description of the three units that make up the
basic IBM
RT Personal Computer! System. These descriptions are for the
minimum system. Your system may contain devices
that are not described
in this section.
For service information on a particular device, see the
section for
that type of device.
System Description 1-3