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

Related Service Procedures ........... 334
Locations . . . . . . . . . . . . . . . . . . . . 336
Parts Listing . . . . . . . . . . . . . . . . . . 337
Dock I (3545) ................. 339
General Preparation . . . . . . . . . . . . . . . 340
General Checkout . . . . . . . . . . . . . . . . 341
Symptom-to-FRU Index . . . . . . . . . . . . . 351
Related Service Procedures ........... 358
Product Overview . . . . . . . . . . . . . . . . 366
FRU Removals and Replacements ........ 367
Locations . . . . . . . . . . . . . . . . . . . . 380
Parts Listing . . . . . . . . . . . . . . . . . . 386
Dock II (3546) ................. 389
General Checkout . . . . . . . . . . . . . . . . 390
Symptom-to-FRU Index . . . . . . . . . . . . . 416
Product Overview . . . . . . . . . . . . . . . . 422
Specifications . . . . . . . . . . . . . . . . . . 427
FRU Removals and Replacements ........ 428
Locations . . . . . . . . . . . . . . . . . . . . 450
Parts Listing . . . . . . . . . . . . . . . . . . 458
Common Devices Checkout .......... 463
External Diskette Drive Test ........... 464
External Display Self-Test ............ 464
External Keyboard/Auxiliary Input Device Checkout 465
Fax/Modem Checkout . . . . . . . . . . . . . . 466
Printer Checkout . . . . . . . . . . . . . . . . 468
Port Replicator Checkout ............ 469
TrackPoint II Checkout ............. 470
TV Tuner . . . . . . . . . . . . . . . . . . . . 471
Common Parts Listing ............. 477
Miscellaneous Information . . . . . . . . . . . 483
Acronyms, Abbreviations and Terms ....... 483
Problem Determination Tips ........... 485
Phone Numbers, U.S. and Canada ........ 486
Notices . . . . . . . . . . . . . . . . . . . . . 489
Contents ix

xIBM Mobile Systems HMM - Volume 1

Introduction
Portable Computer Descriptions .......... 2
Important Service Information ........... 4
FRU Replacement Strategy .......... 4
Hard Disk Drive Replacement Strategy ..... 5
How to Use Error Messages .......... 5
How to Read POST Error Messages ...... 5
Drive and Diskette Compatibility Matrix ....... 6
Safety Notices (Multi-lingual Translations) ..... 7
Safety Information . . . . . . . . . . . . . . . . 14
General Safety . . . . . . . . . . . . . . . . 14
Electrical Safety . . . . . . . . . . . . . . . . 15
Safety Inspection Guide ............ 16
Handling Electrostatic Discharge-Sensitive Devices 18
Grounding Requirements . . . . . . . . . . . . 18
Screw Size Chart ................. 19
 Copyright IBM Corp. 1995 1

Portable Computer Descriptions
All models in the following table have VGA video. Models
N51, CL57, P70/75, and Thinkpads 700x and 720x are
Micro Channel* systems. All others are AT* 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 4M/12M 125M
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 370C 9545 486DX4-75/25 4M/32M 340M
9545 486DX4-75/25 4M/32M 540M
9545 486DX4-75/33 4M/32M 810M
ThinkPad 500 2603-081 486SLC2-50/25 4M/12M 80M
2603-171 486SLC2-50/25 4M/12M 170M
ThinkPad 510 2604 486BLC2-50/25 4M/20M 200M
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
C Color
M Megabyte
P Pen
T Tablet
TPF ThinkPad File
*Trademark of the IBM Corporation.
2IBM Mobile Systems HMM - Volume 1

Model Type Processor Memory Hrd Dsk
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
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
C Color
M Megabyte
P Pen
T Tablet
TPF ThinkPad File
Introduction 3

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 might 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.
Warning: A customized setup configuration (other than
default settings) might exist on the computer you are
servicing. Running Automatic Configuration might 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.
4IBM Mobile Systems HMM - Volume 1

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.
Warning: 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
┌────┬────┬────┬────┐
│ │ │ │ │
┌────┬────┬────┬────┬────┬────┬────┬────┐
│ │ │ │ │ │ │ │ │
└────┴────┴────┴────┴────┴────┴────┴────┘
│ │ │ │ │ │ │ │
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 5

Drive and Diskette Compatibility Matrix
The following table provides identification information for
diskettes and diskette 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
6IBM Mobile Systems HMM - Volume 1

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 apres
remplacement d'une unite en clientele, verifiez que
tous les ressorts, vis et autres pieces sont bien en
place et bien fixes. Pour ce faire, secouez l'unite et
assurez-vous qu'aucun bruit suspect ne se produit.
Des pieces metalliques ou des copeaux de metal
pourraient causer un court-circuit.
Bevor nach einem FRU-Austausch der Computer
wieder angeschlossen wird, muB sichergestellt
werden, daB keine Schrauben, Federn oder andere
Kleinteile fehlen oder im Gehause vergessen wurden.
Der Computer muß geschuttelt und auf
Klappergerausche gepruft werden. Metallteile
oder-splitter konnen Kurzschlusse erzeugen.
Prima di accendere l'elaboratore dopo che 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 scosse elettriche.
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.
Compruebelo agitando el sistema y escuchando los
posibles ruidos que provocarían. Las piezas metálicas
pueden causar cortocircuitos electricos.
Introduction 7

Safety Notice 2
Some standby batteries contain a small amount of
nickel and cadmium. Do not disassemble it, recharge
it, throw it into fire or water, or short-circuit it. Dispose
of the battery as required by local ordinances or
regulations. Use only the battery in the appropriate
parts listing when replacing the RTC or backup
battery. Use of an incorrect battery can result in
ignition or explosion of the battery.
Certaines batteries de secours contiennent du nickel
et du cadmium. Ne les demontez pas, ne les
rechargez pas, ne les exposez ni au feu ni à l'eau.
Ne les mettez pas en court-circuit. Pour les mettre au
rebut, conformez-vous à la reglementation en vigueur.
Lorsque vous remplacez la pile de sauvegarde ou
celle de l'horloge temps reel, veillez à n'utiliser que les
modèles cites dans la liste de pieces detachees
adequate. Une batterie ou une pile inappropriee
risque de prendre feu ou d'exploser.
Einige Hilfsbatterien enthalten geringe Mengen Nickel
und Cadmium. Sie durfen nicht zerlegt,
wiederaufgeladen, Feuer oder Wasser ausgesetzt,
oder kurzgeschlossen werden. Die Batterien mussen
vorschriftsmaBig entsorgt werden. Beim Ersetzen von
RTC oder der Sicherungsbatterie nur Batterien des
Typs verwenden, der in der Ersatzteilliste aufgefuhrt
ist. Der Einsatz falscher Batterien kann zu
Entzundung oder Explosion fuhren.
Alcune batterie di riserva contengono una piccola
quantità di nichel e cadmio. Non smontarle, ricaricarle,
gettarle nel fuoco o nell'acqua n cortocircuitarle.
Smaltirle secondo la normativa in vigore (DPR 915/82,
successive disposizioni e disposizioni locali). Quando
si sostituisce la batteria dell'RTC (real time clock) o la
batteria di supporto, utilizzare soltanto i tipi inseriti
nell'appropriato Catalogo parti. L'impiego di una
batteria non adatta potrebbe determinare l'incendio o
l'esplosione della batteria stessa.
Algunas baterías de reserva contienen una pequeña
cantidad de niquel y cadmio. No las desmonte, ni
recargue, ni las eche al fuego o al agua ni las
cortocircuite. Desechelas tal como dispone la
normativa local. Utilice sólo baterías que se
encuentren en la lista de piezas para sustituir la
batería de reserva o RTC. La utilización de una
batería no apropiada puede provocar la ignición o
explosión de la misma.
8IBM Mobile Systems HMM - Volume 1