IBM 7012 G Series User manual

7012 G Series
Service Guide

Third Edition (April 1997)
This edition notice applies to the 7012 G Series Service Guide. This edition obsoletes all previous editions.
The following paragraph does not apply to the United Kingdom or any country where such
provisions are inconsistent with local law: THIS PUBLICATION IS PRINTED “AS IS” WITHOUT
WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some
states do not allow disclaimer of express or implied warranties in certain transactions; therefore, this
statement may not apply to you.
This publication could include technical inaccuracies or typographical errors. Changes are periodically made
to the information herein; these changes will be incorporated in new editions of the publication. The
manufacturer may make improvements and/or changes in the product(s) and/or program(s) described in this
publication at any time, without notice.
It is possible that this publication may contain reference to, or information about, products (machines and
programs), programming, or services that are not announced in your country. Such references or information
must not be construed to mean that such products, programming, or services will be offered in your country.
Any reference to a licensed program in this publication is not intended to state or imply that you can use only
the licensed program indicated. You can use any functionally equivalent program instead.
AIX is a registered trademark of International Business Machines Corporation.
Medeco is a trademark of Medeco Company.
Micro Channel is a registered trademark of International Business Machines Corporation.
SystemGuard is a trademark of International Business Machines Corporation.
Velcro is a trademark of Velcro Industries.
Copyright International Business Machines Corporation, 1994, 1997. All rights reserved.
Note to US Government Users – Documentation and programs related to restricted rights – Use, duplication,
or disclosure is subject to the restrictions set forth in the GSA ADP Schedule Contract.

Preface iii
Table of Contents
Communications Statements vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Notices xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About This Book xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1. Reference Information 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Base Unit System Unit Locations 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear View without Cover 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Side View without Covers 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Cards 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial Port Splitter Cable 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Keyboard / Mouse Card (KBD) 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Expansion Unit System Unit Locations 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description of the Disk Expansion Unit 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cluster Power Control 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Planar Connector Locations 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Flow 1-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Flow 1-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCSI Cable Routing 1-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 1-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Cables 1-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Inspection Guide 1-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2. Using System Guard 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SystemGuard Power 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SystemGuard Components 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SystemGuard Bring-Up MicroProcessor Overview 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . .
The Operator Panel 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SystemGuard Consoles 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Physical and Electronic Key 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SystemGuard Phases 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stand-By Phase 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Init Phase 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Phase 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Boot Phase 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Run-Time Phase 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SystemGuard Parameters and Flags 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Working with SystemGuard 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SystemGuard Menus 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Menu 2-21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Configuration 2-22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display BUMP Error Log 2-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enable Service Console 2-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disable Service Console 2-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

iv Service Guide
Reset 2-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-Off 2-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Boot 2-26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Off-Line Tests 2-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Set Parameters 2-32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Set National Language 2-38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Some Common SystemGuard Tasks 2-39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Customizing SystemGuard For Your Needs 2-58. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reloading the Flash EEPROM 2-60. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3. Maintenance Analysis Procedures (MAPs) 3-1520-1. . . . . . . . . . . . . . . . . . . . .
MAP 1520: 7012 G Series System Unit - Power Map 3-1520-1. . . . . . . . . . . . . . . . . . . . . . . . .
MAP 1540:7012 G Series Minimum Configuration 3-1540-1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 4. Removal and Replacement Procedures 4-1. . . . . . . . . . . . . . . . . . . . . . . .
Handling Static-Sensitive Devices 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Cover 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Side Cover 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Cover 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Unit Base 4-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operator Panel 4-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Base Unit Adapters 4-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Fan 4-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Base Unit Front Fan 4-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Base Unit CPU/Memory Card Retainers 4-22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disk Drive 4-24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Base Unit Diskette Drive 4-29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Media Devices 4-30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Base Unit CPU Card 4-34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Base Unit Memory Card 4-36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Modules 4-38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RS-485 Card 4-40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Base Unit Battery 4-42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply 4-44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Base Unit System Planar 4-46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Key Lock 4-49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Expansion Unit ECB Card 4-50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Expansion Unit SCSI Cable 4-51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 5. System Installation 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 1. Inventory 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 2. Observe this Safety Notice during Installation 5-2. . . . . . . . . . . . . . . . . . . . . . . . .
Step 3. Checking Customer Outlets 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 4. Setting Up the System Unit 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 5. Set Up Each Device Being Attached 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 6. Connecting Devices to Standard I/O Ports 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 7. Connecting Devices to the Adapters 5-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 8. Arranging the System Unit and Devices 5-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation Checkout 5-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preface v
Chapter 6. Expansion Installation 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RS-485 Cable Interconnection 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCSI Cable Connection 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recognizing the New Unit 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disconnecting Expansion Units 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 7. Parts 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Acronyms for FRU Parts 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Covers and Chassis 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electronics, Drives, and Power (1 of 2) 7-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electronics, Drives, and Power (2 of 2) 7-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7012 G Series Expansion Unit Unique Parts 7-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix A. SystemGuard Test Groups A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SystemGuard Test Groups Table A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SystemGuard Test Group Descriptions A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BUMP Quick I/O Tests Group A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JTAG Test Group A-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Direct I/O Test Group A-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CPU Test Group A-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DCB and Memory Test Group A-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interrupt Tests Group A-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CPU MultiProcessor Test Group A-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix B. Modifying SystemGuard Parameters B-1. . . . . . . . . . . . . . . . . . . . . . . . .
Default Parameter Values B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing Flags and Parameters Under AIX Service Aids B-3. . . . . . . . . . . . . . . . . . . . .
Modifying the Remote Authorization Flag B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modifying the Dial-Out Authorization Flag B-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modifying Dial-In Phone Numbers B-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modifying Dial-Out Phone Numbers B-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modifying the Electronic Mode Switch from Service Line Flag B-6. . . . . . . . . . . . . . . . . .
Reloading the Flash EEPROM B-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix C. SystemGuard Remote Operation Configuration C-1. . . . . . . . . . . . . . .
Terminal Configuration C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flags and Parameters Settings C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modem Configuration Files C-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initializing a Modem C-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing Dial-Out C-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix D. Off Line Diagnostic Error Codes D-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error Logging D-26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix E. System Power States E-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power States E-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glossary: Special Terms Used in SystemGuard X-1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Index X-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

vi Service Guide

Preface vii
Communications Statements
The following statement applies to this product. The statement for other products intended
for use with this product appears in their accompanying manuals.
Federal Communications Commission (FCC) Statement
Note: This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his
own expense.
Properly shielded and grounded cables and connectors must be used in order to meet FCC
emission limits. Neither the provider nor the manufacturer are responsible for any radio or
television interference caused by using other than recommended cables and connectors or
by unauthorized changes or modifications to this equipment. Unauthorized changes or
modifications could void the user’s authority to operate the equipment.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions: (1) this device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause undesired
operation.
United Kingdom Telecommunications Safety Requirements
This equipment is manufactured to the International Safety Standard EN60950 and as such
is approved in the UK under the General Approval Number NS/G/1234/J/100003 for indirect
connection to the public telecommunication network.
The network adapter interfaces housed within this equipment are approved separately, each
one having its own independent approval number. These interface adapters, supplied by the
manufacturer, do not use or contain excessive voltages. An excessive voltage is one which
exceeds 70.7 V peak ac or 120 V dc. They interface with this equipment using Safe Extra
Low Voltages only. In order to maintain the separate (independent) approval of the
manufacturer’s adapters, it is essential that other optional cards, not supplied by the
manufacturer, do not use main voltages or any other excessive voltages. Seek advice from a
competent engineer before installing other adapters not supplied by the manufacturer.
International Electrotechnical Commission (IEC) Statement
This product has been designed and built to comply with IEC Standard 950.

viii Service Guide
European Union (EU) Statement
This product is in conformity with the protection requirements of EU Council Directive
89/336/EEC on the approximation of the laws of the Member States relating to
electromagnetic compatibility.
Neither the provider nor the manufacturer can accept responsibility for any failure to satisfy
the protection requirements resulting from a non-recommended modification of the product,
including the fitting of option cards not supplied by the manufacturer.
This product has been tested and found to comply with the limits for Class A Information
Technology Equipment according to CISPR 22 / European Standard EN 55022. The limits
for Class A equipment were derived for commercial and industrial environments to provide
reasonable protection against interference with licensed communication equipment.
Attention: This is a Class A product. In a domestic environment this product may cause
radio interference in which case the user may be required to take adequate measures.
Avis de conformité aux normes du ministère des Communications du
Canada Cet appareil numérique de la classe A respecte toutes les exigences du Réglement sur le
matériel brouilleur du Canada.
Canadian Department of Communications Compliance Statement
This Class A digital apparatus meets the requirements of the Canadian
Interference-Causing Equipment Regulations.
VCCI Statement
The following is a summary of the VCCI Japanese statement in the box above.
This equipment is in the Class 1 category (information equipment to be used in
commercialand/orindustrialareas)andconformstothestandardssetbytheVol-
untaryControl Council ForInterferencebyDataProcessingEquipmentandElec-
tronic Office Machines aimed at preventing radio interference in commercial and/
or industrial areas.
Consequently,whenusedinaresidentialareaorinanadjacentareathereto,radio
interference may be caused to radios and TV receivers, etc.
Read the instructions for correct handling. VCCI–1.

Preface ix
Radio Protection for Germany
Dieses Gerät ist berechtigt in Übereinstimmung mit dem deutschen EMVG vom 9.Nov.92
das EG-Konformitätszeichen zu führen.
Der Aussteller der Konformitätserklärung ist die IBM Germany.
Dieses Gerät erfüllt die Bedingungen der EN 55022 Klasse A. Für diese Klasse von Geräten
gilt folgende Bestimmung nach dem EMVG:
Geräte dürfen an Orten, für die sie nicht ausreichend entstört sind, nur mit besonderer
Genehmigung des Bundesministers für Post und Telekommunikation oder des Bundesamtes
für Post und Telekommunikation betrieben werden. Die Genehmigung wird erteilt, wenn
keine elektromagnetischen Störungen zu erwarten sind.
(Auszug aus dem EMVG vom 9.Nov.92, Para.3, Abs.4)
Hinweis:
Dieses Genehmigungsverfahren ist von der Deutschen Bundespost noch nicht veröffentlicht
worden.

xService Guide

Preface xi
Safety Notices
Note: For a translation of these notices, see System Unit Safety Information , order number
SA23-2652.
Definitions of Safety Notices
A danger notice indicates the presence of a hazard that has the potential of causing death
or serious personal injury.
A danger notice appears on the following pages:
3-1520-1
4-1
4-44
5-2
A
caution notice indicates the presence of a hazard that has the potential of causing
moderate or minor personal injury.
A caution notice appears on the following pages:
xi
3-1520-1
4-1
4-30
4-42
5-2
5-3
An
attention notice indicates an action that could cause damage to a program, device,
system, or data.
CAUTION:
A lithium battery can cause fire, explosion, or a severe burn. Do not recharge,
disassemble, heat above 100°C (212°F), solder directly to cell, incinerate, or expose
cell contents to water. Keep away from children. Replace only with the part number
specified for your system. Use of another battery may present a risk of fire or
explosion.
The battery connector is polarized; do not attempt to reverse the polarity.
Dispose of the battery according to local regulations.

xii Service Guide
Laser Safety Information
The optical drive in this system unit is a laser product. The optical drive has a label that
identifies its classification. The label, located on the drive, is shown below.
CLASS 1 LASER PRODUCT
LASER KLASSE 1
LUOKAN 1 LASERLAITE
APPAREIL A LASER DE CLASSE 1
TO IEC 825:1984 CENELEC EN 60 825:1991
The optical drive in this system unit is certified in the U.S. to conform to the requirements of
the Department of Health and Human Services 21 Code of Federal Regulations (DHHS 21
CFR) Subchapter J for Class 1 laser products. Elsewhere, the drive is certified to conform to
the requirements of the International Electrotechnical Commission (IEC) 825 (1st edition
1984) and CENELEC EN 60 825:1991 for Class 1 laser products.
CAUTION:
A class 3 laser is contained in the device. Do not attempt to operate the drive while it
is disassembled. Do not attempt to open the covers of the drive as it is not
serviceable and is to be replaced as a unit.
Class 1 laser products are not considered to be hazardous. The optical drive contains
internally a Class 3B gallium-arsenide laser that is nominally 30 milliwatts at 830
nanometers. The design incorporates a combination of enclosures, electronics, and
redundant interlocks such that there is no exposure to laser radiation above a Class 1 level
during normal operation, user maintenance, or servicing conditions.

Preface xiii
About This Book
This book provides maintenance information that is specific to the 7012 G Series system
unit, adapters, and attached devices that do not have their own service information. It also
contains Maintenance Analysis Procedures (MAPs) that are not common to other systems.
MAPs that are common to all systems are contained in
Diagnostic Information For Micro
Channel Bus Systems
.
This book is used by the service technician for initial installation and to repair system
failures. This book assumes that the service technician has had training on the
7012 G
Series
system unit.
ISO 9000 ISO 9000 registered quality systems were used in the development and manufacturing of
this product.
Related Information
The Diagnostic Information For Micro Channel Bus Systems , order number SA23-2765,
contains the maintenance information and procedures that are common to all systems. The
information and procedures in this book apply to any system unit that uses the diagnostic
programs.
Adapters, Devices, and Cable Information , order number SA23-2764 contains reference
information about adapters, devices, and cabling for the system units. This manual also
contains the removal and replacement procedures for the logic boards on the disk drives.
This manual provides the service representative pin-out lists and cabling information to use
in isolating problems with customer cabling.
System Unit Safety Information , order number SA23-2652, contains translated versions of
the danger and caution notices.
The
7012 G Series Setup Procedure, order number SA23-2739, provides information about
the hardware setup of the base unit.
The
7012 G Series Expansion Unit Setup Procedure, order number SA23-2754, provides
information about the hardware setup of the expansion unit.
The
7012 G Series Operator Guide, order number SA23-2740, provides information about
the controls and features of the system unit.
Each attached device has a
Setup and Operator Guide and a Service Guide that provides
the information needed for that device.

Reference Information 1-1
Chapter 1. Reference Information
Use the following views of the system unit to locate the feature positions, connectors, and
system board slot positions.
Base Unit System Unit Locations
Media Bays
Front Door
Operator
Panel
3.5-Inch
Diskette
Drive
Front Cover
Left Side
Cover
Base
Rear
Cover
Key Mode Switch
Reset
Button
Operator
Panel
Display
Power
Button

1-2 Service Guide
Rear View without Cover
Parallel Port (P1)
Adapters
Power Cord
Receptacle
Power Control Port
(RS-485)
Mouse
9-Pin Serial Port (S3)
25-Pin Serial Port
(S1/S2)
Rear
Fan
Keyboard

Reference Information 1-3
Side View without Covers
Micro
Channel
Adapter
Cards
Optional Second
CPU Card Position 0
or
Two Disk Drives
Positions F and G
(G30 only)
Disk Drive
Positions
D and E
System
Planar
Media Drive
Position A
Media Drive
Position B
Diskette Drive
Position C
Operator
Panel
Power
Supply
Front Fan
1
6
...........
Rear
Fan
First CPU Card
Position 1
Memory Card
Position A
Key Mode Switch
RS-485
Card

1-4 Service Guide
Memory Cards
There are four types of memory cards as shown below. Memory cards can house from one
to four memory module kits composed of four memory modules each, which comply with the
JEDEC standard for 68 pin, ECC, 60 ns, 5 volt memory modules. The figure below illustrates
the types of memory cards.
MRE
Memory Card
Two Bank RLX
Memory Card
Four Bank NFX
Memory Card
SF5
Memory Card
See page 4-38 for the location of the memory cards on the system planar.
The figure below shows a standard memory module.
The maximum memory reachable with this kind of memory module is 1024MB, because up
to four memory module kits can be installed on the memory card.
Modules from different size kits cannot be mixed on the same memory card.
According to both the kind and the number of memory module kits installed on the memory
cards, these can be divided into the following configurations:
•MM32, which gives 32MB memory contains four 8MB memory modules.
•MM64, which gives 64MB memory contains four 16MB memory modules.
•MM128, which gives 128MB memory contains four 32MB memory modules.
•MM256, which gives 256MB memory contains four 64MB memory modules.

Reference Information 1-5
•NF256 board, based on 16M bit technology, which gives 256MB memory. It contains two
MM128 memory module kits.
•NF512 board, based on 16M bit technology, which gives 512MB memory. It contains four
MM128 memory module kits.
•NF1024 board, based on 16M bit technology, which gives 1024MB memory. It contains
four MM256 memory module kits.
Serial Port Splitter Cable
The splitter cable is used to generate two 25-pin serial ports (S1 and S2 ports).
It is installed in the 25-pin serial port located in the rear of the base unit.
Keyboard / Mouse Card (KBD)
The KBD card is used to manage the connectors dedicated to the keyboard, mouse and
speaker capability, but not a key click option on the base unit. It must be placed on the
dedicated connector of the system planar (Y10 connector), but interfaces with the system
through the Micro Channel bus, which sees the card as occupying a Micro Channel slot.
Connector used to place
the KBD card on the system
planar

1-6 Service Guide
Expansion Unit System Unit Locations
Description of the Disk Expansion Unit
The disk expansion unit is used to increase the number of media devices and/or disk drives.
All hardware components inside the disk expansion unit are accessible from the left side
after having removed the unit covers.
Power Supply
Rear Fan
Disk Drives
ECB Card
Operator Panel
Key Mode Switch
Media Devices
or Disk Drives
From the left side of the disk expansion unit, the following modules are accessible:
•Up to two 5.25-inch half height media devices (optional). Up to two 3.5-inch half height
disk drive can be installed instead.
•The operator panel (mandatory)
•The key mode switch (mandatory)
•The ECB card (mandatory)
•Up to two disk drives (optional) in the bottom tray
•Up to two disk drives (optional) in the upper tray
•One external cooling fan (mandatory)
•The power supply (mandatory).

Reference Information 1-7
Rear Side The following figure shows the rear side of the disk expansion unit.
Rear Fan
RS-485 Out Port
RS-485 In Port
SCSI Connector
To Base Unit
Power Cord Connector
Disk Expansion Unit SCSI Bus
The disk expansion unit is equipped with one internal SCSI bus. It is driven by means of a
SCSI-2 single-ended controller via an external connection.
The SCSI bus features the following characteristics:
•SCSI-2 single-ended
•16-bit wide data bus
•Support for single-ended devices (8/16 bits)
•8bits and 16bits SCSI devices mixable on the same bus
•Fast data transfer (10MB per second for 8bits, 20MB per second for 16bits)
•Synchronous/Asynchronous data interchange.