IBM N51 Series Owner's manual

Laptop L40SX
Laptop CL57
Notebook N45SL
Notebook N51XX
Portable P70/P75
ThinkPad 300
ThinkPad 350
ThinkPad 500
ThinkPad 510
ThinkPad 710T
Expansion Unit
Dock Station I
Dock Station II
This Manual Supports:
(8543)
(8554)
(2614)
(8551)
(8573)
(2615)
(2618)
(2603)
(2604)
(2523)
(3550)
(3545)
(3546)
S82G-1501-01
IBM Mobile Systems
Hardware Maintenance Manual
Volume 1:Laptop, Notebook, Portable
and ThinkPad Computers
May 1995

S82G-1501-01
IBM Mobile Systems
Hardware Maintenance Manual
Volume 1: Laptop, Notebook, Portable
and ThinkPad Computers
May 1995
IBM

Note
Before using this information and the product it
supports, be sure to read the general information
under “Notices” on page 489.
Second Edition (May 1995)
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.
It is possible that this publication may contain reference to,
or information about, IBM 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 IBM
intends to announce such IBM products, programming, or
services in your country.
Requests for technical information about IBM products
should be made to your IBM authorized reseller or IBM
marketing representative.
 Copyright International Business Machines
Corporation 1995. 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 HMM - Volume 1

About This Manual
This manual contains service and reference information for
IBM* Laptop, Notebook, Portable, and ThinkPad Computer
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 majority of the manual consists of
product-specific sections that include service,
reference, and product-specific parts information.
The Common Devices Checkout section contains
information for testing optional attachable devices
common to the products in this manual.
The Common Parts Listing section contains parts
listings for parts and tools common to the products in
this manual.
The Miscellaneous section contains acronyms,
abbreviations, terms, and a telephone number listing.
Important
This manual is intended for trained servicers who are
familiar with IBM mobile 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 7 and “Safety
Information” on page 14.
*Trademark of the IBM Corporation.
iii

Related Publications
The following publications are available for IBM mobile
products. For more information, contact IBM or your IBM
Authorized Dealer.
Publication Part, Form Number
Mobile Systems HMM Volume 2:
Thinkpad Computers 30H2357, S82G-1502-03
Model L40 SX (8543) HMR 15F2267, S15F2267
Model L40 SX (8543) HMS 15F2266, S15F2266
Model N45SL (2614) HMR 42G0485, S42G0485
Model N45SL (2614) HMS 42G0486, S42G0486
Model N51 SX/SLC (8551) HMR 04G5111, S04G5111
Model N51 SX/SLC (8551) HMS 04G5112, S04G5112
Model CL57 SX (8554) HMR 10G4419, S10G4419
Model CL57 SX (8554) HMS 10G4420, S10G4420
Model P70 386 (8573) HMR 64F3994, S64F3994
Model P70 386 (8573) HMS 15F2198, S15F2198
Model P75 486 (8573) HMR 84F8525, S84F8525
Model P75 486 (8573) HMS 84F7593, S84F7593
ThinkPad 350/350C (2618),
PS/Note 425/425C HMS A211000, GA211000
Expansion Unit (3550-001) HMR 42G2335, S42G2335
Expansion Unit (3550-001) HMS 42G2336, S42G2336
Expansion Unit (3550-002) HMR 42G2331, S42G2331
Expansion Unit (3550-002) HMS 42G2332, S42G2332
PS/2 FaxConcentrator/A HMR
Supplement 15F2662, S15F2662
PS/2 FaxConcentrator/A HMS
Supplement 84F8541, S84F8541
PS/2 Comm. Cartridge I HMR 10G5992, S10G5992
PS/2 Comm. Cartridge I HMS 10G5993, S10G5993
PS/2 Comm. Cartridge II HML
(N51SX) 04G5109, S04G5109
PS/2 Comm. Cartridge II HML
(CL57SX) 10G4421, S10G4421
PS/2 Data/Fax Modem HML 04G5110, S04G5110
IBM High Speed Internal,
PCMCIA Data/Fax Modems 61G1556, S61G1556
iv IBM Mobile Systems HMM - Volume 1

Obsolete Publications
This manual obsoletes the following publication:
Related Diskettes
The following diskettes are available for IBM mobile
products. For more information, contact IBM or your IBM
Authorized Dealer.
Publication Part, Form Number
IBM Laptop, Notebook, and
Portable Computers Vol. 1 82G1501, S82G1501
Diskette Part, Form Number
Model L40 SX (8543)
Reference Diskette 10G5991, S10G5991
Model N45SL (2614)
Advanced Diagnostics 42G0495, S42G0495
Model N51 SX/SLC (8551)
Reference and Diagnostic
Package
04G5117, S04G5117
Model CL57 SX (8554)
Reference Diskette 10G4422, S10G4422
Model P70 386 (8573)
Reference Diskette 84F8535, S84F8535
Model P75 486 (8573)
Reference Diskette A380102, SA380102
ThinkPad Hardware
Maintenance Diskette 82G3891, S82G3891
* Trademark of the IBM Corporation.
v

vi IBM Mobile Systems HMM - Volume 1

Contents
Introduction . . . . . . . . . . . . . . . . . . . 1
Portable Computer Descriptions .......... 2
Important Service Information ........... 4
Drive and Diskette Compatibility Matrix ....... 6
Safety Notices (Multi-lingual Translations) ..... 7
Safety Information . . . . . . . . . . . . . . . . 14
Screw Size Chart ................. 19
Model L40 SX (8543) ............... 23
General Checkout . . . . . . . . . . . . . . . . . 24
Symptom-to-FRU Index . . . . . . . . . . . . . . 32
Related Service Procedures ............ 37
Product Overview . . . . . . . . . . . . . . . . . 38
FRU Removals and Replacements ......... 39
Locations . . . . . . . . . . . . . . . . . . . . . 42
Parts Listing . . . . . . . . . . . . . . . . . . . 43
Model N45SL (2614) ............... 47
General Checkout . . . . . . . . . . . . . . . . . 48
Symptom-to-FRU Index . . . . . . . . . . . . . . 53
Related Service Procedures ............ 63
Product Overview . . . . . . . . . . . . . . . . . 66
FRU Removals and Replacements ......... 67
Locations . . . . . . . . . . . . . . . . . . . . . 70
Parts Listing . . . . . . . . . . . . . . . . . . . 71
Model N51 (8551) ................ 73
General Checkout . . . . . . . . . . . . . . . . . 74
Symptom-to-FRU Index . . . . . . . . . . . . . . 87
Related Service Procedures ............ 95
Product Overview (N51 SX) ............ 98
Product Overview (N51 SLC) ........... 98
FRU Removals and Replacements ......... 99
Locations . . . . . . . . . . . . . . . . . . . . 103
Parts Listing . . . . . . . . . . . . . . . . . . 105
Model CL57 (8554) ............... 111
General Checkout . . . . . . . . . . . . . . . . 112
Symptom-to-FRU Index . . . . . . . . . . . . . 122
Related Service Procedures ........... 131
Product Overview . . . . . . . . . . . . . . . . 134
FRU Removals and Replacements ........ 135
Locations . . . . . . . . . . . . . . . . . . . . 140
Parts Listing . . . . . . . . . . . . . . . . . . 141
Model P70 and P75 (8573) ........... 145
General Checkout . . . . . . . . . . . . . . . . 146
Symptom-to-FRU Index . . . . . . . . . . . . . 151
Related Service Procedures ........... 157
Product Overview (P70) . . . . . . . . . . . . 160
Product Overview (P75) . . . . . . . . . . . . 160
 Copyright IBM Corp. 1995 vii

FRU Removals and Replacements ........ 161
Locations . . . . . . . . . . . . . . . . . . . . 170
Parts Listing (P70) ............... 172
Parts Listing (P75) ............... 178
ThinkPad 300 (2615) .............. 183
General Checkout . . . . . . . . . . . . . . . . 184
Symptom-to-FRU Index . . . . . . . . . . . . . 185
Related Service Procedures ........... 193
Product Overview . . . . . . . . . . . . . . . . 196
FRU Removals and Replacements ........ 197
Locations . . . . . . . . . . . . . . . . . . . . 200
Parts Listing . . . . . . . . . . . . . . . . . . 201
ThinkPad 350, PS/Note 425 (2618) ....... 205
General Checkout . . . . . . . . . . . . . . . . 206
Symptom-to-FRU Index . . . . . . . . . . . . . 211
Related Service Procedures ........... 215
Product Overview . . . . . . . . . . . . . . . . 220
FRU Removals and Replacements ........ 221
Locations . . . . . . . . . . . . . . . . . . . . 225
Parts Listing . . . . . . . . . . . . . . . . . . 226
ThinkPad 500 (2603) .............. 231
General Checkout . . . . . . . . . . . . . . . . 232
Symptom-to-FRU Index . . . . . . . . . . . . . 237
Related Service Procedures ........... 240
Product Overview . . . . . . . . . . . . . . . . 247
FRU Removals and Replacements ........ 248
Locations . . . . . . . . . . . . . . . . . . . . 251
Parts Listing . . . . . . . . . . . . . . . . . . 253
ThinkPad 510 (2604) .............. 257
General Checkout . . . . . . . . . . . . . . . . 258
Symptom-to-FRU Index . . . . . . . . . . . . . 264
Related Service Procedures ........... 268
Product Overview . . . . . . . . . . . . . . . . 275
FRU Removals and Replacements ........ 276
Locations . . . . . . . . . . . . . . . . . . . . 280
Parts Listing . . . . . . . . . . . . . . . . . . 282
ThinkPad 710T (2523) ............. 285
General Checkout . . . . . . . . . . . . . . . . 286
Symptom-to-FRU Index . . . . . . . . . . . . . 296
Related Service Procedures ........... 302
Product Overview . . . . . . . . . . . . . . . . 302
FRU Removals and Replacements ........ 304
Locations . . . . . . . . . . . . . . . . . . . . 307
Parts Listing . . . . . . . . . . . . . . . . . . 310
Expansion Unit (3550) ............. 315
General Checkout (3550-001) .......... 316
General Checkout (3550-002) .......... 322
Symptom-to-FRU Index . . . . . . . . . . . . . 329
viii IBM Mobile Systems HMM - Volume 1