IBM ThinkPad 365C 2625 User manual

This Manual Supports:
ThinkPad 365C/CD (2625)
ThinkPad 365CS/CSD (2625)
ThinkPad 365X/XD (2625)
ThinkPad 380 (2635)
ThinkPad 385 (2635)
ThinkPad 560 (2640)
ThinkPad 760C/CD (9546)
ThinkPad 760E/ED (9546)
ThinkPad 760L/LD (9546)
ThinkPad 760EL/ELD (9547)
ThinkPad 760XL (9546)
ThinkPad 760XD (9547)
SelectaDock (3547)
S82G-1503-05
IBM Mobile Systems
Hardware Maintenance Manual
Volume 3: ThinkPad Computers
March 1997
We Want Your Comments!
(Please see page 611)

S82G-1503-05
IBM Mobile Systems
Hardware Maintenance Manual
Volume 3: ThinkPad Computers
March 1997
We Want Your Comments!
(Please see page 611)
IBM

Note
Before using this information and the product it
supports, be sure to read the general information
under “Notices” on page 616.
Sixth Edition (March 1997)
The following paragraph does not apply to the United
Kingdom or any country where such provisions are
inconsistent with local law: INTERNATIONAL
BUSINESS MACHINES CORPORATION PROVIDES THIS
PUBLICATION “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. IBM may make
improvements and/or changes in the product(s) and/or the
program(s) described in this publication at any time.
This publication was developed for products and services
offered in the United States of America. IBM may not offer
the products, services, or features discussed in this
document in other countries, and the information is subject
to change without notice. Consult your local IBM
representative for information on the products, services,
and features available in your area.
Requests for technical information about IBM products
should be made to your IBM reseller or IBM marketing
representative.
 Copyright International Business Machines
Corporation 1997. All rights reserved.
Note to U.S. Government users–Documentation related to
Restricted rights–Use, duplication, or disclosure is subject
to restrictions set forth in GSA ADP Schedule Contract
with IBM Corp.
ii IBM Mobile Systems - ThinkPad HMM Volume 3

About This Manual
This manual contains service and reference information for
IBM ThinkPad 365, 380, 385, 560, 760, and SelectaDock
products. Use this manual along with the advanced
diagnostic tests to troubleshoot problems effectively.
The manual is divided into sections as follows:
The Introduction section provides general information,
guidelines, and safety information required to service
computers.
The product-specific sections include service,
reference, and product-specific parts information.
The Common Devices Checkout section provides
procedures for testing the devices that are commonly
attached to ThinkPad computers.
The Miscellaneous Information section contains
information about acronyms, abbreviations, terms,
and a telephone number listing.
Important
This manual is intended for trained servicers who are
familiar with ThinkPad products. Use this manual
along with the advanced diagnostic tests to
troubleshoot problems effectively.
Before servicing an IBM mobile product, be sure to
review the safety information under “Safety Notices
(Multi-lingual Translations)” on page 8 and “Safety
Information” on page 15.
iii

Related Publications
The following mobile product publications are available
through IBM or your IBM Authorized Dealer.
Publication Part, Form Number
Mobile Systems HMM
Volume 1: Laptop,
Notebook, Portable, and
ThinkPad Computers
(Models L40, CL57, N45,
N51, P70/P75, ThinkPad
300, 350, 500, 510, 710T,
Expansion Unit, Dock I,
Dock II)
30H2356, S82G-1501-01
Mobile Systems HMM
Volume 2: ThinkPad
Computers
(Model 340, 355, 360, 370,
700, 701, 720, 750, 755)
30H2357, S82G-1502-03
ThinkPad 700 (9552) HMS 42G2016, S42G-2016
ThinkPad 700 (9552) HMR 42G2015, S42G-2015
ThinkPad 700C (9552) HMS 42G2022, S42G-2022
ThinkPad 700C (9552) HMR 42G2021, S42G-2021
ThinkPad 720/720C (9552)
HMS 61G1193, S61G-1193
ThinkPad 720/720C (9552)
HMR 61G1187, S61G-1187
ThinkPad 730T (2524) HMM 82G5497, S82G-5497
ThinkPad Exp. Crtg. (3550)
HMS 42G2338, S42G-2338
ThinkPad Exp. Crtg. (3550)
HMR 42G2339, S42G-2339
PS/2 FaxConcentrator HMS 15F2262, S15F-2262
PS/2 FaxConcentrator HMR 84F8541, S84F-8541
PS/2 Comm. Cartridge I
HMS 10G5993, S10G-5993
PS/2 Comm. Cartridge I
HMR 10G5992, S10G-5992
IBM High Speed Internal,
PCMCIA Data/Fax Modems 61G1556, S61G-1556
iv IBM Mobile Systems - ThinkPad HMM Volume 3

Related Diskettes
The following diskettes are available through IBM or your
IBM Authorized Dealer.
Diskette Part, Form Number
ThinkPad 300 (2615)
Advanced Diagnostics
Diskette
33G9361, S33G-9361
ThinkPad 350, 350C, 425,
425C (2618) Advanced
Diagnostics Diskette
A211000, GA21-1000
ThinkPad 365 (2625)
Advanced Diagnostics
Diskette
76H7578, S30H-2498
ThinkPad 500 (2603)
Advanced Diagnostics
Diskette
71G3702, S71G-3702
ThinkPad 510 (2604)
Advanced Diagnostics
Diskette
83G8095, S83G-8095
ThinkPad 700 (9552)
Reference Diskette 42G2017, S42G-2017
ThinkPad 700C (9552)
Reference Diskette 42G2023, S42G-2023
ThinkPad 720/720C (9552)
Reference Diskette 61G1194, S61G-1194
ThinkPad Hardware
Maintenance Diskette
(for all Models 355, 360,
560, 750, 755, 760)
78H5384, S78H-5384
ThinkPad Dock I (3545) 71G4140, S71G-4140
Docking Station (3550) 42G2428, S42G-2428
Data/Fax Modem 61G1556, S61G-1556
FaxConcentrator/A 84F8540, S84F-8540
v

vi IBM Mobile Systems - ThinkPad HMM Volume 3

Contents
Introduction . . . . . . . . . . . . . . . . . . . 1
Portable Computer Descriptions .......... 2
Drive and Diskette Compatibility Matrix ....... 5
Important Service Information ........... 6
Safety Notices (Multi-lingual Translations) ..... 8
Safety Information . . . . . . . . . . . . . . . . 15
Laser Compliance Statement ........... 20
Screw Size Chart ................. 22
ThinkPad 365 (2625) . . . . . . . . . . . . . . 25
Read This First .................. 27
General Checkout . . . . . . . . . . . . . . . . . 30
Symptom-to-FRU Index . . . . . . . . . . . . . . 41
Related Service Procedures ............ 50
Diagnostic Test Programs ............. 52
Using the Diagnostics Test Programs ....... 54
Product Overview (365C, CD, CS, CSD) ...... 58
Product Overview (365E, ED) . . . . . . . . . . . 59
FRU Removals and Replacements ......... 60
Locations . . . . . . . . . . . . . . . . . . . . . 81
Parts Listing 365C, CD, CS, CSD (2625) ..... 84
Parts Listing 365E, ED (2625) ........... 87
ThinkPad 365X, 365XD (2625) .......... 91
Read This First .................. 93
Checkout Guide . . . . . . . . . . . . . . . . . 96
Symptom-to-FRU Index . . . . . . . . . . . . . 106
Related Service Procedures ........... 117
Product Overview (365X, 365XD) . . . . . . . . 126
FRU Removals and Replacements ........ 127
Locations . . . . . . . . . . . . . . . . . . . . 164
Parts Listing 365X, 365XD (2625) ........ 170
ThinkPad 380, 380D, 385, 385D (2635) ..... 183
Read This First ................. 185
Checkout Guide . . . . . . . . . . . . . . . . 189
Symptom-to-FRU Index . . . . . . . . . . . . . 199
Related Service Procedures ........... 210
Product Overview (380, 380D, 385, 385D) .... 215
FRU Removals and Replacements ........ 216
Locations . . . . . . . . . . . . . . . . . . . . 249
Parts Listing 380/385 (2635) .......... 252
ThinkPad 560 (2640) . . . . . . . . . . . . . 263
Read This First ................. 265
Checkout Guide . . . . . . . . . . . . . . . . 268
Symptom-to-FRU Index . . . . . . . . . . . . . 279
Related Service Procedures ........... 291
Product Overview (560) . . . . . . . . . . . . . 296
FRU Removals and Replacements ........ 297
Locations . . . . . . . . . . . . . . . . . . . . 321
 Copyright IBM Corp. 1997 vii

Parts Listing 560 (2640) ............. 325
ThinkPad 760 (9546, 9547) . . . . . . . . . . 335
Read This First ................. 338
Checkout Guide . . . . . . . . . . . . . . . . 341
Symptom-to-FRU Index . . . . . . . . . . . . . 359
Related Service Procedures ........... 372
Product Overview (760) . . . . . . . . . . . . . 377
FRU Removals and Replacements ........ 382
LCD Removal and Replacement ......... 427
LCD Unit, 12.1 SVGA (P/N 29H9226, ASM P/N
29H9029) . . . . . . . . . . . . . . . . . . . 428
LCD Unit, 12.1 SVGA (P/N 29H9226, ASM P/N
73H6599) . . . . . . . . . . . . . . . . . . . 433
LCD Unit, 10.4 SVGA (P/N 29H9227) ...... 439
LCD Unit, 10.4 VGA (P/N 46H5355) ....... 444
LCD Unit, 11.3 DSTN (P/N 39H6232) ...... 449
LCD Unit, 12.1 XGA .............. 454
LCD Unit, 12.1 SVGA (P/N 82H8496) ...... 460
LCD Unit, 12.1 SVGA (P/N 11J8867, ASM P/N
11J8855) . . . . . . . . . . . . . . . . . . . 466
LCD Unit, 12.1 SVGA (P/N 46H5725, ASM P/N
46H5723) . . . . . . . . . . . . . . . . . . . 472
Locations . . . . . . . . . . . . . . . . . . . . 478
Parts Listing 760 (9546, 9547) ......... 483
LCD Parts List ................. 520
ThinkPad SelectaDock Docking System .... 547
Read This First ................. 548
General Preparation . . . . . . . . . . . . . . . 550
Checkout Guide . . . . . . . . . . . . . . . . 551
Printer . . . . . . . . . . . . . . . . . . . . . 554
Running Diagnostics . . . . . . . . . . . . . . 559
Symptom-to-FRU Index . . . . . . . . . . . . . 565
Undetermined Problems . . . . . . . . . . . . . 573
FRU Removals and Replacements ........ 574
Locations . . . . . . . . . . . . . . . . . . . . 583
Parts Listing SelectaDock (3547) ........ 588
Common Devices Checkout .......... 591
External Diskette Drive Test ........... 592
External Display Self-Test ............ 592
External Keyboard/Auxiliary Input Device Checkout 593
Fax/Modem Checkout . . . . . . . . . . . . . . 594
Printer Checkout . . . . . . . . . . . . . . . . 596
Port Replicator Checkout ............ 597
TrackPoint Checkout . . . . . . . . . . . . . . 598
TV Tuner . . . . . . . . . . . . . . . . . . . . 599
Common Parts Listing ............. 605
Miscellaneous Information . . . . . . . . . . . 609
Acronyms, Abbreviations and Terms ....... 609
Send Us Your Comments! ............ 611
viii IBM Mobile Systems - ThinkPad HMM Volume 3

Do You Need Technical References? ...... 612
Problem Determination Tips ........... 613
Phone Numbers, U.S. and Canada ........ 614
Notices . . . . . . . . . . . . . . . . . . . . . 616
Contents ix

xIBM Mobile Systems - ThinkPad HMM Volume 3

Introduction
Portable Computer Descriptions .......... 2
Drive and Diskette Compatibility Matrix ....... 5
Important Service Information ........... 6
How to Use Error Messages .......... 7
How to Read POST Error Messages ...... 7
Safety Notices (Multi-lingual Translations) ..... 8
Safety Information . . . . . . . . . . . . . . . . 15
General Safety . . . . . . . . . . . . . . . . 15
Electrical Safety . . . . . . . . . . . . . . . . 16
Safety Inspection Guide ............ 17
Handling Electrostatic Discharge-Sensitive Devices 19
Grounding Requirements . . . . . . . . . . . . 19
Laser Compliance Statement ........... 20
Screw Size Chart ................. 22
 Copyright IBM Corp. 1997 1

Portable Computer Descriptions
Models N51, CL57, and P70/75 and Thinkpads 700x and
720x are Micro Channel systems. All others are AT/ISA
bus systems.
Model Type Processor Memory Hrd Dsk
Model L40SX 8543-044 386SX-20 2M/18M 60M
Model N45 SL 2614-065 386SL-25 2M/8M 80M
2614-067 386SL-25 2M/8M 120M
Model N51 SLC 8551-025 386SLC-16 2M/10M 80M
Model N51 SX 8551-033 386SX-16 2M/10M 40M
Model CL57 SX 8554-045 386SX-20 2M/16M 80M
Model P70 386 8573-031 80386-16 2M/8M 30M
8573-061 80386-20 2M/8M 60M
8573-121 80386-20 2M/8M 120M
Model P75 486 8573-161 80486-33 8M/16M 160M
8573-401 80486-33 8M/16M 400M
ThinkPad 300 2615-065 386SL-25 4M/12M 80M
2615-067 386SL-25 4M/12M 120M
ThinkPad 340 2610 486SLC2-50/25 4M/12M 125M
ThinkPad 340CSE 2610 486SLC2-50/25 4M/12M 200M
ThinkPad 340CSE 2610 486SLC2-66/33 4M/12M 360M
ThinkPad 345 2610 486DX4-75 4M/20M 360M
ThinkPad 345CS 2610 DX4-75 4M/20M 540M
ThinkPad 350 2618-AOE 486SL-25 4M/20M 85M
2618-JOA 486SL-25 4M/20M 125M
2618-LOA 486SL-25 4M/20M 250M
ThinkPad 350C 2618-NOA 486SL-25 4M/20M 125M
2618-POA 486SL-25 4M/20M 250M
ThinkPad 355 2619 486SX-33 4M/16M 125M
ThinkPad 355C 2619 486SX-33 4M/16M 125M
2619 486SX-33 4M/16M 250M
ThinkPad 355Cs 2619 486SX-33 2M/16M 170M
2619 486SX-33 2M/16M 250M
ThinkPad 360 2620 486SX-33 4M/16M 170M
2620 486SX-33 4M/16M 340M
ThinkPad 360C 2620 486SX-33 4M/16M 170M
2620 486SX-33 4M/16M 340M
ThinkPad 360Cs 2620 486SX-33 4M/16M 170M
2620 486SX-33 4M/16M 340M
ThinkPad 360Ce 2620 486DX2-50/25 4M/16M 170M
2620 486DX2-50/25 4M/16M 340M
2620 486DX2-50/25 4M/16M 540M
ThinkPad 360Cse 2620 486DX2-50/25 4M/16M 170M
2620 486DX2-50/25 4M/16M 340M
2620 486DX2-50/25 4M/16M 540M
ThinkPad 360P 2620 486SX-33 4M/16M 170M
2620 486SX-33 4M/16M 340M
ThinkPad 365C 2625-205 486DX4-75 8M/24M 340M
2625-x05 486DX4-75 8M/24M 540M
ThinkPad 365E 2625 5x86-100/33 8M/24M 540M
ThinkPad 365ED 2625 5x86-100/33 8M/24M 540M
ThinkPad 365X/XD 2625 Pentium-100 8M/24M 540M
2625 Pentium-100 8M/24M 810M
2625 Pentium-100 8M/24M 1.0G
ThinkPad 365X/XD 2625 Pentium-120 8M/24M 540M
2625 Pentium-120 8M/24M 810M
2625 Pentium-120 8M/24M 1.0G
ThinkPad 365X/XD 2625 Pentium-133 8M/40M 810M
2625 Pentium-133 8M/40M 1.0G
2625 Pentium-133 8M/40M 1.3G
ThinkPad 370C 9545 486DX4-75/25 4M/32M 340M
9545 486DX4-75/25 4M/32M 540M
9545 486DX4-75/33 4M/32M 810M
C Color
M Megabyte
P Pen
T Tablet
TPF ThinkPad File
2IBM Mobile Systems - ThinkPad HMM Volume 3

Model Type Processor Memory Hrd Dsk
ThinkPad 380 2635 Pentium-150 16M/48M 1.08G
2635 Pentium-150 16M/48M 1.35G
2635 Pentium-150 16M/48M 2.10G
ThinkPad 385 2635 Pentium-150 16M/48M 1.08G
2635 Pentium-150 16M/48M 1.35G
2635 Pentium-150 16M/48M 2.10G
ThinkPad 500 2603-081 486SLC2-50/25 4M/12M 80M
2603-171 486SLC2-50/25 4M/12M 170M
ThinkPad 560 2640 Pentium-100 8M/40M 540M
2640 Pentium-100 8M/40M 810M
2640 Pentium-100 8M/40M 1.0G
ThinkPad 560 2640 Pentium-120 8M/40M 540M
2640 Pentium-120 8M/40M 810M
2640 Pentium-120 8M/40M 1.0G
ThinkPad 560 2640 Pentium-130 8M/40M 540M
2640 Pentium-130 8M/40M 810M
2640 Pentium-130 8M/40M 1.0G
ThinkPad 700 9552-300 486SLC-25 4M/16M 80M
9552-301 486SLC-25 4M/16M 120M
ThinkPad 700C 9552-30B 486SLC-25 4M/16M 120M
ThinkPad 701C 2630 486DX2-25/50 4M/32M 360MB
2630 486DX2-25/50 4M/32M 540MB
2630 486DX4-25/75 8M/32M 360MB
2630 486DX4-25/75 8M/32M 540MB
ThinkPad 701Cs 2630 486DX2-25/50 4M/32M 360MB
2630 486DX2-25/50 4M/32M 540MB
2630 486DX4-25/75 8M/32M 360MB
2630 486DX4-25/75 8M/32M 540MB
ThinkPad 710T 2523-09Y 486SLC2-25 4M/12M TPF
2523-302 486SLC2-25 4M/12M 60M
2523-303 486SLC2-25 4M/12M 60M
ThinkPad 720 9552-307 486SLC-25/50 4M/16M 120M
9552-308 486SLC-25/50 4M/16M 160M
ThinkPad 720C 9552-30J 486SLC-25/50 4M/16M 160M
ThinkPad 730T 2524 486SLC2-25 4M/12M 0M
2524 486SLC2-25 4M/12M 60M
ThinkPad 750 9545-006 486SL-33 4M/20M 170M
9545-008 486SL-33 4M/20M 340M
ThinkPad 750C 9545-306 486SL-33 4M/20M 170M
9545-308 486SL-33 4M/20M 340M
ThinkPad 750Ce 9545 P24S-50/25 4M/20M 340M
ThinkPad 750Cs 9545 486SL-33 4M/20M 170M
9545 486SL-33 4M/20M 340M
ThinkPad 750P 9545-40C 486SL-33 4M/20M 170M
9545-40E 486SL-33 4M/20M 340M
ThinkPad 755C 9545 486DX4-50/25 4M/32M 170M
9545 486DX4-50/25 4M/32M 340M
9545 486DX4-50/25 4M/32M 540M
9545 486DX4-75/25 4M/32M 170M
9545 486DX4-75/25 4M/32M 340M
9545 486DX4-75/25 4M/32M 540M
ThinkPad 755CD 9545 486DX4-100/33 8M/32M 540M
9545 486DX4-100/33 8M/32M 810M
ThinkPad 755CDV 9545 486DX4-100/33 8M/32M 540M
9545 486DX4-100/33 8M/32M 810M
ThinkPad 755Ce 9545 486DX4-100/33 8M/32M 340M
9545 486DX4-100/33 8M/32M 540M
9545 486DX4-100/33 8M/32M 810M
ThinkPad 755Cs 9545 486DX4-50/25 8M/32M 170M
9545 486DX4-50/25 8M/32M 340M
9545 486DX4-50/25 8M/32M 540M
9545 486DX4-75/25 8M/32M 170M
9545 486DX4-75/25 8M/32M 340M
9545 486DX4-75/25 8M/32M 540M
ThinkPad 755Cse 9545 486DX4-100/33 8M/32M 340M
9545 486DX4-100/33 8M/32M 540M
9545 486DX4-100/33 8M/32M 810M
C Color
M Megabyte
P Pen
T Tablet
TPF ThinkPad File
Introduction 3

Model Type Processor Memory Hrd Dsk
ThinkPad 755CV 9545 486DX4-100/33 8M/32M 540M
9545 486DX4-100/33 8M/32M 810M
ThinkPad 755CV 9545 486DX4-100/33 8M/32M 540M
9545 486DX4-100/33 8M/32M 810M
ThinkPad 760C/CD 9546 Pentium-90 8M/40M 360M
9546 Pentium-120 8M/40M 720M
9546 Pentium-90 8M/40M 810M
9546 Pentium-120 8M/40M 1.2G
ThinkPad 760E/ED 9546 Pentium-120 8M/80M 810M
9546 Pentium-133 8M/80M 1.0G
9546 Pentium-150 8M/80M 1.2G
9546 Pentium-166 8M/80M 1.3G
9546 Pentium-166 8M/80M 2.1G
ThinkPad 760EL/ELD 9547 Pentium-100 8M/80M 810M
9547 Pentium-100 8M/80M 1.0G
9547 Pentium-100 8M/80M 1.2G
9547 Pentium-120 8M/80M 810M
9547 Pentium-120 8M/80M 1.0G
9547 Pentium-120 8M/80M 1.2G
9547 Pentium-133 8M/80M 810M
9547 Pentium-133 8M/80M 1.0G
9547 Pentium-133 8M/80M 1.2G
ThinkPad 760L/LD 9547 Pentium-90 8M/40M 810M
9547 Pentium-90 8M/40M 1.1G
9547 Pentium-90 8M/40M 1.2G
9547 Pentium-120 8M/40M 810M
9547 Pentium-120 8M/40M 1.1G
9547 Pentium-120 8M/40M 1.2G
ThinkPad 760X 9546 Pentium-150 32M/80M 3.0G
ThinkPad 760XD 9546 Pentium-166 32M/80M 3.0G
ThinkPad 760XL 9547 Pentium-166 16M/80M 2.1G
9547 Pentium-166 16M/80M 3.0G
C Color
M Megabyte
P Pen
T Tablet
TPF ThinkPad File
4IBM Mobile Systems - ThinkPad HMM Volume 3

Drive and Diskette Compatibility Matrix
The following table provides identification information for
3.5-inch drives.
Diskette
Drive Identifying Mark
3.5-Inch - 1.44MB 1.44 on the eject button
3.5-Inch - 2.88MB 2.88 on the eject button
The following table provides compatibility information for
3.5-inch diskettes and 3.5-inch diskette drives.
The following table provides identification information for
5.25-inch diskette drives.
Diskette
Capacity 1.44MB Drive 2.88MB Drive
1.0MB Read/Write Read/Write
2.0MB Read/Write Read/Write
4.0MB Not Compatible Read/Write
Diskette
Drive Identifying Mark
5.25-Inch - 360KB (External) Asterisk on bezel
5.25-Inch - 1.2MB (Internal) 1.2 on the eject button
The following table provides compatibility information for
5.25-inch diskettes and 5.25-inch diskette drives.
Note: A 360KB diskette written to or formatted on a
1.2MB drive can be read reliably only on a 1.2MB
drive.
Diskette
Capacity 360KB Drive 1.2MB Drive
360KB Read/Write Read/Write
1.2MB Not Compatible Read/Write
Introduction 5

Important Service Information
Important
Diskette fixes are customer installable. The diskette
fixes are located on the PC Company Bulletin Board
Service (BBS). The direct phone line for modem
connection is 919-557-0001 or tieline 255-0001.
Advise customers to contact the PC Company
HelpCenter at 800-772-2227 if they need assistance in
obtaining or installing any diskette fixes.
Customers in Canada should call IBM HelpPC at
800-565-3344 for assistance or down-load information.
The Canadian BBS phone numbers are:
Montreal 514-938-3022
Toronto 905-316-4255
Vancouver 604-664-6464
Winnipeg 204-934-2735
FRU Replacement Strategy
Before Replacing Parts
Ensure that all diskette fixes are installed prior to
replacing any FRUs listed in this manual.
Use the following strategy to prevent unnecessary FRU
replacement and service expense:
If you are instructed to replace a FRU and that
does not correct the problem, reinstall the original
FRU before you continue.
Some computers have both a processor board and a
system board. If you are instructed to replace either
the processor board or the system board, and the first
board that you replaced does not correct the problem,
reinstall the original board, then replace the other
(processor or system) board.
If an adapter or device consists of more than one
FRU, an error code may be caused by any of the
FRUs. Before replacing the adapter or device,
remove the FRUs, one by one, to see if the
symptoms change. Replace only the FRU that
changed the symptoms.
Attention
A customized setup configuration (other than default
settings) may exist on the computer you are servicing.
Running Automatic Configuration may alter those
settings. Note the current configuration settings (using
the View Configuration option) and verify that the
settings are in place when service is complete.
6IBM Mobile Systems - ThinkPad HMM Volume 3

The advanced diagnostic tests are intended to test only
IBM products. Non-IBM products or modified options can
give false errors and invalid responses.
Hard Disk Drive Replacement Strategy:
Always try to run a low-level format before replacing a hard
disk drive.
Attention
The drive startup sequence in the computer you are
servicing might have been changed. Be extremely
careful during write operations such as copying,
saving, or formatting. Data or programs can be
overwritten if you select an incorrect drive.
How to Use Error Messages
Use the error codes displayed on the screen to diagnose
failures. If more than one error code is displayed, begin
the diagnosis with the first error code. The cause of the
first error code can result in false error codes being
displayed. If no error code is displayed, see if the error
symptom is listed in the Symptom-to-FRU Index for the
computer you are servicing.
How to Read POST Error Messages
POST error messages are displayed on the screen as
three, four, five, or eight digits. The error messages that
can be displayed as shorter POST messages are
highlighted in this index. Some digits will represent
different information for SCSI errors versus non-SCSI
errors.
The following example shows which digits display the
shorter POST error messages and also defines the SCSI
information in an eight-digit error message.
Shorter POST Messages
┌────┬────┬────┬────┐
│ │ │ │ │
┌────┬────┬────┬────┬────┬────┬────┬────┐
│ ð│ ð│ ð│ ð│ ð│ ð│ ð│ ð│
└────┴────┴────┴────┴────┴────┴────┴────┘
│ │ │ │ │ │ │ │
Reserved ││││││Size (SCSI)
└────┴────┘ │ │ Slot Number (SCSI)
Device Code │ Logical Unit Number (SCSI)
ID (SCSI)
All SCSI devices are set to a different SCSI ID.
Duplicate SCSI ID settings can generate a false error
message. Use the SCSI ID to determine whether the error
message is coming from an internal or an external device.
Introduction 7

Safety Notices (Multi-lingual
Translations)
In this manual, safety notices appear in English with a
page number reference to the appropriate multi-lingual,
translated safety notice found in this section.
The following safety notices are provided in English,
French, German, Italian, and Spanish languages.
Safety Notice 1
Before the computer is powered-on after FRU
replacement, make sure all screws, springs, or other
small parts are in place and are not left loose inside
the computer. Verify this by shaking the computer
and listening for rattling sounds. Metallic parts or
metal flakes can cause electrical shorts.
Avant de remettre l'ordinateur sous tension après
remplacement d'une unité en clientèle, vérifiez que
tous les ressorts, vis et autres pièces sont bien en
place et bien fixées. Pour ce faire, secouez l'unité et
assurez-vous qu'aucun bruit suspect ne se produit.
Des pièces métalliques ou des copeaux de métal
pourraient causer un court-circuit.
Bevor nach einem FRU-Austausch der Computer
wieder angeschlossen wird, muß sichergestellt
werden, daß keine Schrauben, Federn oder andere
Kleinteile fehlen oder im Gehäuse vergessen wurden.
Der Computer muß geschüttelt und auf
Klappergeräusche geprüft werden. Metallteile oder
-splitter können Kurzschlüsse erzeugen.
Prima di accendere l'elaboratore dopo che é stata
effettuata la sostituzione di una FRU, accertarsi che
tutte le viti, le molle e tutte le altri parti di piccole
dimensioni siano nella corretta posizione e non siano
sparse all'interno dell'elaboratore. Verificare ciò
scuotendo l'elaboratore e prestando attenzione ad
eventuali rumori; eventuali parti o pezzetti metallici
possono provocare cortocircuiti pericolosi.
Antes de encender el sistema despues de sustituir
una FRU, compruebe que todos los tornillos, muelles
y demás piezas pequeñas se encuentran en su sitio y
no se encuentran sueltas dentro del sistema.
Compruébelo agitando el sistema y escuchando los
posibles ruidos que provocarían. Las piezas metálicas
pueden causar cortocircuitos eléctricos.
8IBM Mobile Systems - ThinkPad HMM Volume 3