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IBM Mobile Systems

Hardware Maintenance Manual Volume 1:Laptop, Notebook, Portable

and ThinkPad Computers

May 1995

S82G-1501-01

This Manual Supports:

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

(8543) (8554) (2614) (8551) (8573) (2615) (2618) (2603) (2604) (2523) (3550) (3545) (3546)

IBM Mobile Systems

Hardware Maintenance Manual Volume 1: Laptop, Notebook, Portable

and ThinkPad Computers

May 1995

S82G-1501-01

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.

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

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 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 PS/2 FaxConcentrator/A HMS

Supplement PS/2 Comm. Cartridge I HMR 10G5992, S10G5992 PS/2 Comm. Cartridge I HMS 10G5993, S10G5993 PS/2 Comm. Cartridge II HML

(N51SX) PS/2 Comm. Cartridge II HML

(CL57SX) PS/2 Data/Fax Modem HML 04G5110, S04G5110 IBM High Speed Internal,

PCMCIA Data/Fax Modems

30H2357, S82G-1502-03

A211000, GA211000

15F2662, S15F2662

84F8541, S84F8541

04G5109, S04G5109

10G4421, S10G4421

61G1556, S61G1556

iv IBM Mobile Systems HMM - Volume 1

Obsolete Publications

This manual obsoletes the following publication:

Publication Part, Form Number

IBM Laptop, Notebook, and Portable Computers Vol. 1

82G1501, S82G1501

Related Diskettes

The following diskettes are available for IBM mobile products. For more information, contact IBM or your IBM Authorized Dealer.

Diskette Part, Form Number

Model L40 SX (8543) Reference Diskette

Model N45SL (2614) Advanced Diagnostics

Model N51 SX/SLC (8551) Reference and Diagnostic Package

Model CL57 SX (8554) Reference Diskette

Model P70 386 (8573) Reference Diskette

Model P75 486 (8573) Reference Diskette

ThinkPad Hardware Maintenance Diskette

10G5991, S10G5991

42G0495, S42G0495

04G5117, S04G5117

10G4422, S10G4422

84F8535, S84F8535

A380102, SA380102

82G3891, S82G3891

Trademark of the IBM Corporation.

vi IBM Mobile Systems HMM - Volume 1

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

x IBM 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

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

Model P75 486 8573-161 80486-33 8M/16M 160M

ThinkPad 300 2615-065 386SL-25 4M/12M 80M

ThinkPad 340 2610 486SLC2-50 4M/12M 125M ThinkPad 350 2618-AOE 486SL-25 4M/20M 85M

ThinkPad 350C 2618-NOA 486SL-25 4M/20M 125M

ThinkPad 355 2619 486SX-33 4M/16M 125M ThinkPad 355C 2619 486SX-33 4M/16M 125M

ThinkPad 355Cs 2619 486SX-33 2M/16M 170M

ThinkPad 360 2620 486SX-33 4M/16M 170M

ThinkPad 360C 2620 486SX-33 4M/16M 170M

ThinkPad 360Cs 2620 486SX-33 4M/16M 170M

ThinkPad 360Ce 2620 486DX2-50/25 4M/16M 170M

ThinkPad 360Cse 2620 486DX2-50/25 4M/16M 170M

ThinkPad 360P 2620 486SX-33 4M/16M 170M

ThinkPad 370C 9545 486DX4-75/25 4M/32M 340M

ThinkPad 500 2603-081 486SLC2-50/25 4M/12M 80M

ThinkPad 510 2604 486BLC2-50/25 4M/20M 200M ThinkPad 700 9552-300 486SLC-25 4M/16M 80M

ThinkPad 700C 9552-30B 486SLC-25 4M/16M 120M

C Color M Megabyte P Pen

2614-067 386SL-25 2M/8M 120M

8573-061 80386-20 2M/8M 60M 8573-121 80386-20 2M/8M 120M

8573-401 80486-33 8M/16M 400M

2615-067 386SL-25 4M/12M 120M

2618-JOA 486SL-25 4M/20M 125M 2618-LOA 486SL-25 4M/20M 250M

2618-POA 486SL-25 4M/20M 250M

2619 486SX-33 4M/16M 250M

2619 486SX-33 2M/16M 250M

2620 486SX-33 4M/16M 340M

2620 486DX2-50/25 4M/16M 340M 2620 486DX2-50/25 4M/16M 540M

2620 486SX-33 4M/16M 340M

9545 486DX4-75/25 4M/32M 540M 9545 486DX4-75/33 4M/32M 810M

2603-171 486SLC2-50/25 4M/12M 170M

9552-301 486SLC-25 4M/16M 120M

T Tablet TPF ThinkPad File

Trademark of the IBM Corporation.

2 IBM Mobile Systems HMM - Volume 1

Model Type Processor Memory Hrd Dsk

ThinkPad 701C 2630 486DX2-25/50 4M/32M 360MB

ThinkPad 701Cs 2630 486DX2-25/50 4M/32M 360MB

ThinkPad 710T 2523-09Y 486SLC2-25 4M/12M TPF

ThinkPad 720 9552-307 486SLC-25/50 4M/16M 120M

ThinkPad 720C 9552-30J 486SLC-25/50 4M/16M 160M ThinkPad 730T 2524 486SLC2-25 4M/12M 0M

ThinkPad 750 9545-006 486SL-33 4M/20M 170M

ThinkPad 750C 9545-306 486SL-33 4M/20M 170M

ThinkPad 750Ce 9545 P24S-50/25 4M/20M 340M ThinkPad 750Cs 9545 486SL-33 4M/20M 170M

ThinkPad 750P 9545-40C 486SL-33 4M/20M 170M

ThinkPad 755C 9545 486DX4-50/25 4M/32M 170M

ThinkPad 755CD 9545 486DX4-100/33 8M/32M 540M

ThinkPad 755CDV 9545 486DX4-100/33 8M/32M 540M

ThinkPad 755Ce 9545 486DX4-100/33 8M/32M 340M

ThinkPad 755Cs 9545 486DX4-50/25 8M/32M 170M

ThinkPad 755Cse 9545 486DX4-100/33 8M/32M 340M

ThinkPad 755CV 9545 486DX4-100/33 8M/32M 540M

C Color M Megabyte P Pen

2630 486DX2-25/50 4M/32M 540MB 2630 486DX4-25/75 8M/32M 360MB 2630 486DX4-25/75 8M/32M 540MB

2523-302 486SLC2-25 4M/12M 60M 2523-303 486SLC2-25 4M/12M 60M

9552-308 486SLC-25/50 4M/16M 160M

2524 486SLC2-25 4M/12M 60M

9545-008 486SL-33 4M/20M 340M

9545-308 486SL-33 4M/20M 340M

9545 486SL-33 4M/20M 340M

9545-40E 486SL-33 4M/20M 340M

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

9545 486DX4-100/33 8M/32M 810M

9545 486DX4-100/33 8M/32M 540M 9545 486DX4-100/33 8M/32M 810M

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

9545 486DX4-100/33 8M/32M 540M 9545 486DX4-100/33 8M/32M 810M

9545 486DX4-100/33 8M/32M 810M

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.

4 IBM 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)

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.

Device Code │ Logical Unit Number (SCSI)

Introduction

Drive and Diskette Compatibility Matrix

The following table provides identification information for diskettes and diskette drives.

Diskette Drive

3.5-Inch - 1.44MB 1.44 on the eject button

3.5-Inch - 2.88MB 2.88 on the eject button

Identifying Mark

The following table provides compatibility information for

3.5-inch diskettes and 3.5-inch diskette drives.

Diskette Capacity

1.0MB Read/Write Read/Write

2.0MB Read/Write Read/Write

4.0MB Not Compatible Read/Write

1.44MB Drive

2.88MB Drive

The following table provides identification information for

5.25-inch diskette drives.

Diskette Drive

5.25-Inch - 360KB (External) Asterisk on bezel

5.25-Inch - 1.2MB (Internal) 1.2 on the eject button

Identifying Mark

The following table provides compatibility information for

5.25-inch diskettes and 5.25-inch diskette drives.

Diskette Capacity

360KB Read/Write Read/Write

1.2MB Not Compatible Read/Write

360KB Drive

1.2MB Drive

Note: A 360KB diskette written to or formatted on a

1.2MB drive can be read reliably only on a 1.2MB drive.

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.

8 IBM Mobile Systems HMM - Volume 1

Safety Notice 3

The battery pack contains small amounts of nickel. Do not disassemble it, throw it into fire or water, or short-circuit it. Dispose of the battery pack as required by local ordinances or regulations. Use only the battery in the appropriate parts listing when replacing the battery pack. Use of an incorrect battery can result in ignition or explosion of the battery.

La batterie contient du nickel. Ne la demontez pas, ne l'exposez ni au feu ni à l'eau. Ne la mettez pas en court-circuit. Pour la mettre au rebut, conformez-vous à la reglementation en vigueur. Lorsque vous remplacez la batterie, veillez à n'utiliser que les modeles cites dans la liste de pieces detachees adequate. En effet, une batterie inappropriee risque de prendre feu ou d'exploser.

Auch Akkus enthalten geringe Mengen von Nickel. 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.

La batteria contiene piccole quantità di nichel. Non smontarla, gettarla nel fuoco o nell'acqua nè cortocircuitarla. Smaltirla secondo la normativa in vigore (DPR 915/82, successive disposizioni e disposizioni locali). Quando si sostituisce la batteria, 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.

Las baterías contienen pequeñas cantidades de niquel. 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 al sustituir la batería. La utilización de una batería no apropiada puede provocar la ignición o explosión de la misma.

Introduction 9

Safety Notice 4

The lithium battery can cause a fire, explosion, or severe burn. Do not recharge it, remove its polarized connector, disassemble it, heat it above 100 degrees C (212 degrees F), incinerate it, or expose its cell contents to water. Dispose of the battery as required by local ordinances or regulations. Use of an incorrect battery can result in ignition or explosion of the battery. Replacement batteries can be ordered from IBM or IBM Authorized Dealers.

La pile de sauvegarde contient du lithium. Elle presente des risques d'incendie, d'explosion ou de brûlures graves. Ne la rechargez pas, ne retirez pas son connecteur polarise et ne la demontez pas. Ne l'exposez pas à une temperature superieure à 100ØC, ne la faites pas brûler et n'en exposez pas le contenu à l'eau. Mettez la pile au rebut conformement à la reglementation en vigueur. Une pile inappropriee risque de prendre feu ou d'exploser. Les piles de rechange peuvent etre obtenues aupres d'IBM ou d'un distributeur agree IBM.

Die Sicherungsbatterie ist eine Lithiumbatterie. Sie kann sich entzunden, explodieren oder schwere Verbrennungen hervorrufen. Batterien dieses Typs durfen nicht aufgeladen, zerlegt, uber 100 C erhitzt, verbrannt, deren Polkappen abgenommen oder deren Inhalt mit Wasser in Verbindung gebracht werden. Die Batterien mussen vorschriftsmaBig entsorgt werden. Der Einsatz falscher Batterien kann zu Entzundung oder Explosion fuhren. Austauschbatterien können bei IBM oder IBM Vertragspartnern bestellt werden.

La batteria di supporto e una batteria al litio e puo incendiarsi, esplodere o procurare gravi ustioni. Evitare di ricaricarla, smontarne il connettore polarizzato, smontarla, riscaldarla ad una temperatura superiore ai 100 gradi centigradi, incendiarla o gettarla in acqua. Smaltirla secondo la normativa in vigore (DPR 915/82, successive disposizioni e disposizioni locali). L'impiego di una batteria non adatta potrebbe determinare l'incendio o l'esplosione della batteria stessa. Le batterie possono essere ordinate ai rivenditori autorizzati IBM o all'IBM.

La bateria de repuesto es una bateria de litio y puede provocar incendios, explosiones o quemaduras graves. No la recargue, ni quite el conector polarizado, ni la desmonte, ni caliente por encima de los 100oC (212oF), ni la incinere ni exponga el contenido de sus celdas al agua. Desechela tal como dispone la normativa local.

10 IBM Mobile Systems HMM - Volume 1

Safety Notice 5

If the LCD breaks and the fluid from inside the LCD gets into your eyes or on your hands, immediately wash the affected areas with water for at least 15 minutes. Seek medical care if any symptoms from the fluid are present after washing.

Si le panneau d'affichage à cristaux liquides se brise et que vous recevez dans les yeux ou sur les mains une partie du fluide, rincez-les abondamment pendant au moins quinze minutes. Consultez un medecin si des symptomes persistent apres le lavage.

Wenn die LCD-Anzeige zerbrechen sollte und die darin enthaltene Flussigkeit mit Augen oder Handen in Beruhrung kommt, sofort mindestens 15 Minuten lang die betroffenen Korperstellen mit Wasser abwaschen. Sollten danach noch durch die LCD-Flussigkeit hervorgerufene Symptome auftreten sollte ein Arzt aufgesucht werden.

In caso l'LCD si dovesse rompere ed il liquido in esso contenuto entrasse in contatto con gli occhi o le mani, lavare immediatamente le parti interessate con acqua corrente per almeno 15 minuti; poi consultare un medico se i sintomi dovessero permanere.

Si la LCD se rompe y el fluido de su interior entra en contacto con sus ojos o sus manos, lave inmediatamente las áreas afectadas con agua durante 15 minutos como minimo. Obtenga atención medica si se presenta algún sintoma del fluido despues de lavarse.

Safety Notice 6

To avoid shock, do not remove the plastic cover that surrounds the lower portion of the inverter card.

Afin d'viter tout risque de choc lectrique, ne retirez pas le cache en plastique prot geant la partie inf rieure de la carte d'alimentation.

Aus Sicherheitsgr nden die Kunststoffabdeckung, die den unteren Teil der Spannungswandlerplatine umgibt, nicht entfernen.

Per evitare scosse elettriche, non rimuovere la copertura in plastica che avvolge la parte inferiore della scheda invertitore.

Para evitar descargas, no quite la cubierta de pl stico que rodea la parte baja de la tarjeta invertida.

Introduction 11

Safety Notice 7

Though main batteries have low voltage, a shorted or grounded battery can produce enough current to burn combustible materials or personnel.

Bien que le voltage des batteries principales soit peu eleve, le court-circuit ou la mise à la masse d'une batterie peut produire suffisamment de courant pour brûler des materiaux combustibles ou causer des brûlures corporelles graves.

Obwohl Hauptbatterien eine niedrige Spannung haben, konnen sie doch bei KurzschluB oder Erdung genug Strom erzeugen, um brennbare Materialien zu entzunden oder Verletzungen bei Personen hervorzurufen.

Sebbene le batterie di alimentazione siano a basso voltaggio, una batteria in corto circuito o a massa può fornire corrente sufficiente da bruciare materiali combustibili o provocare ustioni ai tecnici di manutenzione.

Aunque las baterías principales tienen un voltaje bajo, una batería cortocircuitada o con contacto a tierra puede producir la corriente suficiente como para quemar mate- rial combustible o provocar quemaduras en el personal.

12 IBM Mobile Systems HMM - Volume 1

Safety Notice 8

Before removing any FRU, power-off the computer, unplug all power cords from electrical outlets, remove the battery pack, then disconnect any interconnecting cables.

Avant de retirer une unite remplacable en clientele, mettez le systeme hors tension, debranchez tous les cordons d'alimentation des socles de prise de courant, retirez la batterie et deconnectez tous les cordons d'interface.

Die Stromzufuhr muB abgeschaltet, alle Stromkabel aus der Steckdose gezogen, der Akku entfernt und alle Verbindungskabel abgenommen sein, bevor eine FRU entfernt wird.

Prima di rimuovere qualsiasi FRU, spegnere il sistema, scollegare dalle prese elettriche tutti i cavi di alimentazione, rimuovere la batteria e poi scollegare i cavi di interconnessione.

Antes de quitar una FRU, apague el sistema, desenchufe todos los cables de las tomas de corriente electrica, quite la batería y, a continuación, desconecte cualquier cable de conexión entre dispositivos.

Introduction 13

Safety Information

The following section contains the safety information that you need to be familiar with before servicing an IBM mobile computer.

General Safety

Follow these rules to ensure general safety:

 Observe good housekeeping in the area of the

machines during and after maintenance.

 When lifting any heavy object:

1. Ensure you can stand safely without slipping.

2. Distribute the weight of the object equally between your feet.

3. Use a slow lifting force. Never move suddenly or twist when you attempt to lift.

4. Lift by standing or by pushing up with your leg muscles; this action removes the strain from the muscles in your back.

objects that weigh more than 16 kg (35 lb) or objects that you think are too heavy for you.

 Do not perform any action that causes hazards to the

customer, or that makes the equipment unsafe.

 Before you start the machine, ensure that other

service representatives and the customer's personnel are not in a hazardous position.

 Place removed covers and other parts in a safe

place, away from all personnel, while you are servicing the machine.

 Keep your tool case away from walk areas so that

other people will not trip over it.

 Do not wear loose clothing that can be trapped in the

moving parts of a machine. Ensure that your sleeves are fastened or rolled up above your elbows. If your hair is long, fasten it.

 Insert the ends of your necktie or scarf inside clothing

or fasten it with a nonconductive clip, approximately 8 centimeters (3 inches) from the end.

 Do not wear jewelry, chains, metal-frame eyeglasses,

or metal fasteners for your clothing. Remember: A metal object is a conductor of

electricity.

 Wear safety glasses when you are:

– Hammering – Drilling – Soldering – Cutting wire – Attaching springs – Using solvents

– Working in any other conditions that might be

hazardous to your eyes

Do not attempt to lift any

14 IBM Mobile Systems HMM - Volume 1

 After service, reinstall all safety shields, guards,

labels, and ground wires. Replace any safety device that is worn or defective.

 Reinstall all covers correctly before returning the

machine to the customer.

Electrical Safety

Observe the following rules when working on electrical equipment.

Important

Use only approved tools and test equipment. Some hand tools have handles covered with a soft material that does not insulate you when working with live electrical currents.

Many customers have, near their equipment, rubber floor mats that contain small conductive fibers to decrease electrostatic discharges. Do not use this type of mat to protect yourself from electrical shock.

 Find the room emergency power-off (EPO) switch,

disconnecting switch, or electrical outlet. If an electrical accident occurs, you can then operate the switch or unplug the power cord quickly.

 Do not work alone under hazardous conditions or

near equipment that has hazardous voltages.

 Disconnect all power before:

– Performing a mechanical inspection – Working near power supplies – Removing or installing main units

 Before you start to work on the machine, unplug the

power cord. If you cannot unplug it, ask the customer to power-off the wall box that supplies power to the machine and to lock the wall box in the off position.

 If you need to work on a machine that has

electrical circuits, observe the following precautions:

– Ensure that another person, familiar with the

power-off controls, is near you. Remember: Another person must be there to

switch off the power, if necessary.

– Use only one hand when working with

powered-on electrical equipment; keep the other hand in your pocket or behind your back.

Remember: There must be a complete circuit to cause electrical shock. By observing the above rule, you might prevent a current from passing through your body.

– When using testers, set the controls correctly

and use the approved probe leads and accessories for that tester.

exposed

Introduction

– Stand on suitable rubber mats (obtained locally,

if necessary) to insulate you from grounds such as metal floor strips and machine frames.

Observe the special safety precautions when you work with very high voltages; these instructions are in the safety sections of maintenance information. Use extreme care when measuring high voltages.

 Regularly inspect and maintain your electrical hand

tools for safe operational condition.

 Do not use worn or broken tools and testers. 

Never assume

from a circuit. First, powered-off.

 Always look carefully for possible hazards in your

work area. Examples of these hazards are moist floors, nongrounded power extension cables, power surges, and missing safety grounds.

 Do not touch live electrical circuits with the reflective

surface of a plastic dental mirror. The surface is conductive; such touching can cause personal injury and machine damage.

 Do not service the following parts

when they are removed from their normal operating places in a machine:

– Power supply units

– Pumps

– Blowers and fans

– Motor generators and similar units. (This practice ensures correct

grounding of the units.)

 If an electrical accident occurs:

– Use caution; do not become a victim

yourself.

– Switch off power. – Send another person to get medical aid.

that power has been disconnected

check

that it has been

with the power on

Safety Inspection Guide

The intent of this inspection guide is to assist you in identifying potentially unsafe conditions on these products. Each machine, as it was designed and built, had required safety items installed to protect users and service personnel from injury. This guide addresses only those items. However, good judgment should be used to identify potential safety hazards due to attachment of non-IBM features or options not covered by this inspection guide.

If any unsafe conditions are present, you must determine how serious the apparent hazard could be and whether you can continue without first correcting the problem.

Consider these conditions and the safety hazards they present:

16 IBM Mobile Systems HMM - Volume 1

 Electrical hazards, especially primary power (primary

voltage on the frame can cause serious or fatal electrical shock).

 Explosive hazards, such as a damaged CRT face or

bulging capacitor

 Mechanical hazards, such as loose or missing

hardware

The guide consists of a series of steps presented in a checklist. Begin the checks with the power off, and the power cord disconnected.

Checklist:

1. Check exterior covers for damage (loose, broken, or sharp edges).

2. Power-off the computer. Disconnect the power cord.

3. Check the power cord for:

a. A third-wire ground connector in good condition.

Use a meter to measure third-wire ground continuity for 0.1 ohm or less between the external ground pin and frame ground.

b. The power cord should be the appropriate type

as specified in the parts listings.

c. Insulation must not be frayed or worn.

4. Remove the cover.

5. Check for any obvious non-IBM alterations. Use good judgment as to the safety of any non-IBM alterations.

6. Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination, water or other liquids, or signs of fire or smoke damage.

7. Check for worn, frayed, or pinched cables.

8. Check that the power-supply cover fasteners (screws or rivets) have not been removed or tampered with.

Introduction

Handling Electrostatic Discharge-Sensitive Devices

Any computer part containing transistors or integrated circuits (ICs) should be considered sensitive to electrostatic discharge (ESD). ESD damage can occur when there is a difference in charge between objects. Protect against ESD damage by equalizing the charge so that the machine, the part, the work mat, and the person handling the part are all at the same charge.

Notes:

1. Use product-specific ESD procedures when they exceed the requirements noted here.

2. Make sure that the ESD protective devices you use have been certified (ISO 9000) as fully effective.

When handling ESD-sensitive parts:

 Keep the parts in protective packages until they are

inserted into the product.

 Avoid contact with other people.  Wear a grounded wrist strap against your skin to

eliminate static on your body.

 Prevent the part from touching your clothing. Most

clothing is insulative and retains a charge even when you are wearing a wrist strap.

 Use the black side of a grounded work mat to provide

a static-free work surface. The mat is especially useful when handling ESD-sensitive devices.

 Select a grounding system, such as those listed

below, to provide protection that meets the specific service requirement.

Note: The use of a grounding system is desirable

but not required to protect against ESD damage.

– Attach the ESD ground clip to any frame ground,

ground braid, or green-wire ground.

– Use an ESD common ground or reference point

when working on a double-insulated or battery-operated computer. You can use coax or connector-outside shells on these computers.

– Use the round ground-prong of the AC plug on

AC-operated computers.

Grounding Requirements

Electrical grounding of the PS/2 computer is required for operator safety and correct computer function. Proper grounding of the electrical outlet can be verified by a certified electrician.

18 IBM Mobile Systems HMM - Volume 1

Screw Size Chart

Use the chart below to match the size and shape of the screws used in the computer you are servicing.

Silver

Black

Silver

Brass

Black

Brass

Silver

Brass

Silver

Introduction 19

Black

Brass

Screw Size Chart (continued):

to match the size and shape of the screws used in the computer you are servicing.

Use the chart below

Brass

Black

Brass

Black

Brass

Black

Brass

Black

Brass

Black

Silver

20 IBM Mobile Systems HMM - Volume 1

Screw Size Chart (continued):

to match the size and shape of the screws used in the computer you are servicing.

Use the chart below

Silver

Brass

Silver

Black

Brass

Silver

Brass

Black

Introduction 21

Silver

Black

22 IBM Mobile Systems HMM - Volume 1

Model L40 SX (8543)

General Checkout . . . . . . . . . . . . . . . . . 24

Memory Checkout . . . . . . . . . . . . . . . 25

Power Systems Checkout ........... 27

Symptom-to-FRU Index . . . . . . . . . . . . . . 32

Undetermined Problem . . . . . . . . . . . . . 36

Related Service Procedures ............ 37

Checking Installed Devices ........... 37

Power-on Password . . . . . . . . . . . . . . 37

How to Run Advanced Diagnostics ....... 37

Product Overview . . . . . . . . . . . . . . . . . 38

FRU Removals and Replacements ......... 39

Locations . . . . . . . . . . . . . . . . . . . . . 42

Parts Listing . . . . . . . . . . . . . . . . . . . 43

 Copyright IBM Corp. 1995 23

General Checkout

001

DOES THE POWER SOURCE APPEAR TO BE OK? Yes No

002

Go to “Power Systems Checkout” on page 27.

003

– Power-off the computer and all external devices. – Insert the backup copy of the Advanced Diagnostics

diskette into the diskette drive.

– Power-on the computer and check for the following

responses:

1. All icons on the system-status display appear once for about 1 second.

Note: Some icons remain on after 1 second.

2. Memory counts.

3. One or two short beeps

4. The Speaker icon starts blinking and continues blinking until any key is pressed.

5. The IBM Logo is displayed on the screen.

DID YOU RECEIVE THE CORRECT RESPONSES? Yes No

004

Go to “Symptom-to-FRU Index” on page 32.

005

– Advance to the Main Menu. – Press Ctrl+A, then type 0 to run the tests.

DID YOU RECEIVE AN ERROR MESSAGE OR ERROR CODE? Yes No

006

The diagnostic tests have completed without detecting an error.

007

Go to “Symptom-to-FRU Index” on page 32.

24 IBM Mobile Systems HMM - Volume 1

Memory Checkout

Notes:

1. Power-off the computer before removing or replacing any parts.

2. Run AUTOMATIC CONFIGURATION after removing or replacing memory modules. (If you have to run configuration with your own diskette, be sure the customer has all the correct option diskettes available.)

3. Disregard 164 Memory-Size Errors. (Model L40 does not work with the combination of two 4MB memory modules installed.)

001

– Remove the memory module kits in connectors 1 and 2

if installed. Note which memory module kit is in connector 1.

– Run the memory tests.

Use the RUN TESTS ONE TIME option.

DID THE MEMORY TESTS END WITHOUT AN ERROR? Yes No

002

Replace the system board.

003

DID YOU REMOVE THE MEMORY MODULE KIT IN CONNECTOR 1? Yes No

004

Go to Step 007.

005

– Reinstall the memory module in connector 1. – Run the memory test.

Use the RUN TESTS ONE TIME option.

DID THE MEMORY TESTS END WITHOUT AN ERROR? Yes No

006

Replace the memory module in connector 1. If that does not correct the problem, replace the system board.

007

(Step 007 continues)

Model L40 SX (8543) 25

(CONTINUED)

007 (continued) DID YOU REMOVE THE MEMORY MODULE KIT IN CONNECTOR 2? Yes No

008

Go to Step 011.

009

– Reinstall the memory module in connector 2. – Run the memory test.

Use the RUN TESTS ONE TIME option.

DID THE MEMORY TESTS END WITHOUT AN ERROR? Yes No

010

Replace the memory module in connector 2. If that does not correct the problem, replace the system board.

011

Check if the actual memory size of the memory module is different from the displayed memory size on the screen. If the problem occurs intermittently, run the memory tests multiple times to have an error log.

26 IBM Mobile Systems HMM - Volume 1

Power Systems Checkout

Note

One or all of the batteries can discharge if there is a short circuit in the computer.

1. Replace the failing FRU if the power supply problem is caused by a short circuit.

2. Determine if one (or all) of the batteries have become discharged. Replace a discharged battery with a known-good spare (or recharge the main or standby battery.)

The test procedures for each power supply are found on the following pages.

 “Testing the AC Adapter” on page 29.  “Testing the Rechargeable Battery” on page 29.  “Testing the Backup Battery” on page 30.  “Testing the Standby Battery” on page 30.  “Testing the Quick Charger” on page 31.

None of the above? Follow the steps below.

001

DID THE PROBLEM OCCUR ONLY WHEN USING THE AC ADAPTER? Yes No

002

Go to Step 004.

003

Go to “Testing the AC Adapter” on page 29. If that does not correct the problem, replace the system board.

004

DID THE PROBLEM OCCUR ONLY WHEN USING THE BATTERY? Yes No

005

Go to Step 011 on page 28.

006

DOES A FULLY-CHARGED BATTERY DISCHARGE QUICKLY? Yes No

007

Go to Step 010 on page 28.

Model L40 SX (8543)

(CONTINUED)

008

– Run advanced diagnostics for all devices using the AC

adapter. Use the ‘RUN TEST ONE TIME’ option.

DID ALL THE TESTS END WITHOUT AN ERROR? Yes No

009

Follow the instructions on the screen. If the instructions do not appear or do not correct the problem, replace the system board.

010

Go to “Testing the Rechargeable Battery” on page 29. If that does not correct the problem, replace the system board.

011

– Remove the following if installed:

 Rechargeable battery  Standby battery  Backup battery

 Memory module kits in connectors 1 and 2  Internal Data/Fax Modem adapter

 Serial adapter  Numeric keypad  TrackPoint  Mouse  External keyboard

 External CRT display  Cables to the hard disk drive  Cables to the diskette drive  Power cable to the LCD  Signal cables to the LCD

– Connect the AC adapter and power-on the computer.

DID YOU HEAR ONE LONG OR TWO SHORT BEEPS? Yes No

012

Replace the system-status display to verify the fix. If the problem still remains, put back the original system-status display, then replace the system board.

013

– Suspect one of the options or devices. Reinstall each of

the options or devices to the computer one at a time, and power-on the computer to see if the original problem occurs.

(Step 013 continues)

28 IBM Mobile Systems HMM - Volume 1

013 (continued)

– Replace the last installed option or device when the

problem occurs.

Testing the AC Adapter

1. If a noise can be heard from the AC adapter when it is plugged into line voltage, replace the AC adapter.

If a noise still comes from the AC adapter, suspect the computer. If not, the AC adapter has a problem. Replace the AC adapter with the original one, then go to the next step.

2. Measure the output voltage at the plug of the AC adapter cable.

Pin Voltage (V dc)

1 +14.3 to +15.8 2 Ground

If the voltage is not correct, replace the AC adapter.

Testing the Rechargeable Battery

1. Remove the keyboard.

2. Set the rechargeable battery in place without connecting any external power devices.

3. Measure the voltage between terminals 1 (+) and 2 (−) and note the voltage.

1(+)

4. Using the AC adapter, apply external power to the computer. Make sure that a charge arrow appears in the system-status display.

5. Measure the voltage again between terminals 1 (+) and 2 (−).

If the voltage is not greater than the one measured in Step 3, replace the AC adapter. If the voltage is greater than the one measured in Step 3, go to the next step.

Model L40 SX (8543) 29

6. Remove the rechargeable battery from the computer.

7. Measure the voltage at the battery terminals.

3( )

2(T)

1(+)

Pin Voltage (V dc)

1 +8.5 to +12.6 3 Ground

If the voltage is not correct, the rechargeable battery is discharged or defective. If the voltage is correct, go to the next step.

8. Using a low-power ohm meter, measure the resistance at the battery terminals between 2 (T) and 3 (−). The resistance must be 4 kilohms to 30 kilohms.

If the resistance is out of range, replace the rechargeable battery.

Testing the Backup Battery

1. Remove the keyboard and the top cover.

2. Measure the voltage at the connectors of the backup battery.

Pin Voltage (V dc)

1 +2.8 to +3.2 2 Ground

If the voltage is not correct, the backup battery is discharged by a short circuit or is defective.

Testing the Standby Battery

Note: The charging time required is 48 hours.

1. Remove the keyboard and the top cover.

2. Connect the AC adapter to the computer.

30 IBM Mobile Systems HMM - Volume 1

3. Disconnect the standby battery connector from the system board and measure the voltage at the connector of the standby battery as shown.

(Black)

Pin Voltage (V dc)

1 +3.0 to +4.5 2 Ground

(Red)

If the voltage is correct, perform the failing operation with a fully-charged standby battery to isolate the problem.

If the voltage is not correct, continue.

4. Measure the output voltage at the connector on the system board.

(-) (+)

(Top View)

If the voltage is higher than measured in Step 3, the standby battery is discharged or is defective.

If the voltage is the same as measured in Step 3 or less than +3.0 V dc, replace the standby battery. If the problem remains, replace the system board.

Testing the Quick Charger: If a noise can be

heard from the operating quick charger, replace it.

1. Perform steps 6 through 8 on page 30 of the “Testing the Rechargeable Battery” to verify the rechargeable battery for correct operation.

2. Plug the quick charger into an electrical outlet. If the amber power indicator does not turn on, replace

the quick charger.

3. Install the rechargeable battery. If the green charging indicator is not blinking, replace

the quick charger.

Model L40 SX (8543) 31

Symptom-to-FRU Index

The Symptom-to-FRU Index lists symptoms and errors and the possible causes. The most likely cause is listed first.

If the computer displays an error message, first replace FRUs listed in the error message. An

in an error

message can be any number. Note: If you have an IBM device with its own service

manual or a device not supported by the advanced diagnostics tests, refer to the manual for that device.

Symptom/Error FRU/Action

One or more keys do not work. (See “External Keyboard/Auxiliary Input Device Checkout” on page 465 before replacing any FRUs.)

No beep and a blank or unreadable display during POST. (See “Power Systems Checkout” on page 27 before replacing any FRUs.)

No beep with a normal display during POST.

Continuous beep 1. System Board

Repeating short beeps. (See “External Keyboard/Auxiliary Input Device Checkout” on page 465 before replacing any FRUs.)

Dew Point or Temperature icon appears with one long and one short beep.

One long and one short beep.

One long and two short beeps.

One short beep and a blank, unreadable, or flashing display with no external display attached.

One short beep and Diskette Prompt or a program load from the hard disk drive or unable to read diskette(s).

1. Keyboard

2. System Board

1. System Board

2. Any options or devices

3. Power source when failing

4. Speaker

1. Speaker

2. System Board

2. Any options or devices

1. System Board

2. Keyboard

1. System Board

2. Power source when failing

1. System Board

2. Power source when failing

1. System Board

2. Power source when failing

1. Display (LCD)

2. System Board

3. Power source when failing

1. Diskette Drive

2. System Board

3. Diskette Drive Cable

32 IBM Mobile Systems HMM - Volume 1

Symptom/Error FRU/Action

Two short beeps and a blank display.

External display problems. (See “External Display Self-Test” on page 464 before replacing any FRUs.)

Incorrect memory size during POST. (See “Memory Checkout” on page 25 before replacing any FRUs.)

Computer hang-up or intermittent hang-up.

Computer does not suspend or resume. (Check the Suspend icon to make sure of the failure.)

Computer does not power off.

Real-time clock inaccurate. 1. System Board Printer problems. 1. See “Printer

Serial or parallel port device problems.

ICON is incorrectly blinking or stays on.

ICON incorrectly remains off, but diagnostics runs without an error.

Internal Data/Fax Modem does not communicate with a remote modem or a fax. (See “Fax/Modem Checkout” on page 466 before replacing any FRUs.)

101, 103, 107, 111 1. System Board

109, 110, 121

(See “Memory Checkout” on page 25 before replacing any FRUs.)

1. System Board

2. Any options or devices

1. External Display

2. System Board

1. System Board

2. Memory Module Kits

1. System Board

2. Hard Disk Drive

3. Math Coprocessor

4. Replace the last device being tested

(See “Undetermined Problem” on page 36.)

1. System Board

2. System-Status Display Assembly

3. Any options or devices

1. System-Status

Display Assembly

2. System Board

Checkout” on page 468.

1. Device

2. Cable

3. System Board

1. System Board

2. Related Device

1. System Board

2. Related Device

3. System-Status Display Assembly

1. Internal Data/Fax

Modem

(Make sure

Modem power

set to on in the Set Features program.)

2. Hard Disk Drive

3. Diskette Drive

4. Any attached devices

1. Memory Module Kits

2. System Board

Data/Fax

option is

Model L40 SX (8543) 33

Symptom/Error FRU/Action 122, 124 1. System Board

123 1. Hard Disk Drive

141 1. System-Status

149 1. System Board

161 1. Run Automatic

162 1. Run Automatic

163 1. Time and Date Set?

164

(See “Memory Checkout” on page 25 before replacing any FRUs.)

199 1. See “Checking

1XX

(not listed above)

211

(on POST)

221

(on POST)

204, 214, 224, 240 1. System Board

25X 1. System Board 2XX

(not listed above) (See “Memory Checkout” on page 25 before replacing any FRUs.)

2. Auxiliary Input Device

3. Keyboard

2. System Board

3. Hard Disk Drive Cable

Display Assembly

2. System Board

2. Hard Disk Drive

3. Hard Disk Drive Cable

Configuration

2. Backup Battery

3. System Board

Configuration, then check the installed devices using the View configuration utility.

2. System Board

3. Diskette Drive

4. Hard Disk Drive

5. Math Coprocessor

6. Diskette Drive Cable

7. Hard Disk Drive Cable

2. System Board

1. Run Automatic

Configuration

2. Memory Module Kits

3. System Board

Installed Devices” on page 37.

1. System Board

2. Memory Module Kits

1. System Board

2. Memory Module Kits

1. Memory Module Kits

2. System Board

34 IBM Mobile Systems HMM - Volume 1

Symptom/Error FRU/Action 301, 302 1. System Board

303 1. System Board

304, 305

(See “External Keyboard/Auxiliary Input Device Checkout” on page 465 before replacing any FRUs.)

306, 310 1. System Board 308 1. Numeric Keypad 3XX

(not listed above) (See “External Keyboard/Auxiliary Input Device Checkout” on page 465 before replacing any FRUs.)

602, 653, 654 1. Defective diskette

655, 660, 661 1. System Board 6XX

(not listed above)

7XX 1. Math Coprocessor

9XX 1. System Board

1107 1. Communication

11XX 1. System Board

1207 1. Communication

12XX 1. Any serial adapter

1705 to 1707, 1709, 1711, 1718 to 1720, 1730, 1732

2. Keyboard

2. Numeric Keypad

3. Keyboard

1. Keyboard

2. System Board

3. Numeric Keypad

1. System Board

2. Auxiliary input device

3. Keyboard

2. Diskette Drive

3. System Board

1. Diskette Drive

2. System Board

3. Diskette Drive Cable

2. System Board (IBM does not supply a math coprocessor)

2. Any parallel Device

3. Communication Cable

Cable

2. Any serial adapter

3. Communication Cable

Cable

2. System Board

3. Any serial device

4. Communication Cable

1. Hard Disk Drive (Reformatting the hard disk can recover from the problem.)

Model L40 SX (8543) 35

Symptom/Error FRU/Action 17XX

(not listed above)

24XX 1. System Board 5001 to 5016 1. System Board 5017 to 502X 1. System Board

503X 1. External CRT Display

8601, 8602 1. Pointing Device

8604 1. System Board 86XX

(not listed above)

101XX

(See “Fax/Modem Checkout” on page 466 before replacing any FRUs.)

102XX 1. System-Status

1. Hard Disk Drive

2. System Board

3. Hard Disk Drive Cable

2. LCD Display Assembly

2. System Board

3. Numeric Keypad

1. System Board

2. Pointing Device

3. Numeric Keypad

1. Internal Data/Fax

Modem

2. System Board

3. Any serial device

Display Assembly

2. System Board

3. Related device

Undetermined Problem

You are here because the diagnostics tests did not identify the failing FRU.

Check the power supply in use (see “Power Systems Checkout” on page 27). If the power systems are operating correctly, return here and continue with the following procedure.

1. Power-off the computer and remove the battery packs from the computer.

2. Remove or disconnect one of the following devices or adapter (do not isolate FRUs that are known to be good). a. Non-IBM devices

b. Modem, printer, mouse, or other external device

c. IC DRAM card d. Hard disk drive (fixed disk drive) or diskette drive e. Any adapter and device.

3. Power-on the computer and start the system program.

4. If the symptom remains, repeat steps 2 and 3 until you find the failing FRU or until all FRUs have been removed.

5. If all of the FRUs listed have been removed and the problem remains, replace the system board.

36 IBM Mobile Systems HMM - Volume 1

Related Service Procedures Checking Installed Devices

The Installed Devices List shows the presence of devices in the computer. If an adapter or device is missing from the list, you might have one of the following conditions.

 An adapter or device is defective.  The device missing from the list is an unrecognizable

drive or adapter.

 The device missing from the list requires an additional

diskette. (See the device service manual.)

 A power supply voltage is incorrect (see “Power

Systems Checkout” on page 27).

If the adapter is on the list, run the adapter diagnostics tests. If the list contains an adapter or device that is not installed, go to “Undetermined Problem” on page 36.

Power-on Password

Important

This information is not available in this HMM online format. See your IBM Servicer or IBM Authorized Dealer for this procedure.

How to Run Advanced Diagnostics

1. Power-off the computer.

2. Insert the backup copy of the Reference Diskette into the diskette drive.

3. Power-on the computer.

4. Advance to the Main Menu.

5. Press Ctrl+A to run the System Checkout.

Model L40 SX (8543)

Product Overview

The following table provides a brief overview of the computer features.

Feature Description

Processor (MHz) 386SX 20-Mhz Bus Architecture AT Bus Memory (Standard) 2MB Memory (Maximum) 18MB Video VGA Diskette Drive 3.5-inch Hard Drive 60MB

38 IBM Mobile Systems HMM - Volume 1

FRU Removals and Replacements

Follow the numerical sequence in the FRU removal sequence list and the exploded view to remove or disconnect parts in the correct order. The letters in parentheses in the list indicate screw types. See the “Screw Size Chart” on page 19 to match the letters to the correct screw type and size before replacing each screw.

Safety Notice 8: Translation on page 13

Before removing any FRU, power-off the computer, unplug all power cords from electrical outlets, remove the battery pack, then disconnect any interconnecting cables.

Safety Notice 1: Translation on page 7

.1/ Battery Pack

.2/ Three Screw Covers and Three Screws (C) .3/ Loosen Keyboard Assembly

(Raise front until it clears case.)

.4/ Two Ribbon Cables and Keyboard

(Slide keyboard forward and flip it over in front of computer.)

.5/ Three Top Cover Screws (C)

(Inside right and left rear access doors along top edge)

.6/ Two Status Display Ribbon Cables

.7/ Top Cover

(Use small screwdriver to release latch on left side, if necessary.)

.8/ Two Status Display Screws (F)

(One on each end)

.9/ Status Display Assembly

(contains on/off and power saver switches)

.1ð/ Four Hinge Screws (C)

(Two on each end, inside two rear access doors)

.11/ Left Hinge Cables .12/ Right Hinge Cables .13/ LCD Assembly .14/ Memory Modules

(Do not install two 4MB memory module kits. Install a 2MB memory module kit in connector 1 and a 4MB or 8MB memory module kit in connector 2.)

.15/ Two Screws (F)

(At front edge of diskette drive)

Model L40 SX (8543) 39

.16/ Two Diskette Drive Ribbon Cables .17/ Diskette Drive and Drive Mounting Bracket .18/ Standby Battery .19/ Battery Shield .2ð/ Backup Battery .21/ Adapter Bezel .22/ One Screw (F)

(In corner of serial/modem card)

.23/ Serial/Modem Card .24/ Two Screws (F)

(At front edge of hard disk drive)

.25/ Two Ribbon Cables and Hard Disk Drive

(Have customer backup all information on hard disk drive before removal.)

.26/ External Adapter and Battery Doors .27/ Eight System Board Screws (F) .28/ One Screw (C)

(Inside right-rear access door)

.29/ Two Threaded Hex Spacers

(Inside right-rear access door)

Remaining System Board Cables

.3ð/ System Board

(When replacing system board, install old memory module kits and math coprocessor on new system board. Run Automatic Configuration using customer's backup Reference Diskette.)

.31/ Speaker

40 IBM Mobile Systems HMM - Volume 1

Model L40 Exploded View

Model L40 SX (8543) 41

Locations

System Board

.1/ Suspend/Resume Switch .2/ Backup Battery Connector .3/ Battery Contacts .4/ Standby-Battery Connector .5/ Diskette-Drive Connectors .6/ Display Power Connector .7/ Math Coprocessor Connector .8/ Memory-Module Connector 1 .9/ Memory-Module Connector 2

.1ð/ Speaker Connector .11/ Keyboard Connectors .12/ Password-Override Connector .13/ Switch-Assembly Connector .14/ System-Status Display Connector .15/ Option Connector .16/ Hard-Disk Drive Connectors .17/ Display Signal Connectors .18/ Suspend/Resume Switch Connector

18 17

4 3

(Top View)

4 5 6

78902

42 IBM Mobile Systems HMM - Volume 1

Parts Listing

Model L40 SX (8543) 43

System Unit

Index 1 Display Assembly (LCD) 95F4878 2 System-Status Display Assembly 79F0991 3 Top Cover 79F3893 4 2MB Memory Module Kit 79F1002 4 4MB Memory Module Kit 79F1003 4 8MB Memory Module Kit 79F1004 6 80387SX** Math Coprocessor 79F1006 7 Bottom Cover 79F3884 8 System Board 95F4879

System Board (with attached speaker) 8123176

9 Speaker 79F0989

Speaker (for p/n 8123176) 79F0989

10 Bezel, Blank 79F3888 10 Bezel, Modem 79F3889 10 Bezel, Serial Adapter 79F3868 11 Backup Battery, Lithium 79F0986 13 Shield, Battery 79F3891 14 Standby Battery 79F0992 15 Door, Bus Connector 79F3886 16 Door, Battery 79F3887 17 Door, I/O Connector 79F3885 18 Rechargeable Battery 79F0994 18 Rechargeable Battery

(Switzerland only) System Board Fuse Card 95F6731 Miscellaneous Kit

(screws, rubber bumpers, and bottom cover caps)

79F3881

79F3894

DASD

Index 5 Diskette Drive 79F0983 Cable, Diskette Drive 79F0987 Bezel, Diskette Drive 79F3892 12 60MB Hard Disk Drive 79F1009

80MB Hard Disk Drive 95F4714 Cable, Hard Disk Drive 79F0988

80387SX is a trademark of the Intel Corporation.

44 IBM Mobile Systems HMM - Volume 1

Options and Adapters

2MB Memory Module (80ns) 79F1002 4MB Memory Module (80ns) 79F1003

5.25-inch Drive Adapter/A (360KB/1.2MB) 15F7996 6154 Real-Time Coprocessor (128KB) 60X8192 6166 Real-Time Coprocessor (512KB) 76X1013 8MB Memory Module (80ns) 79F1004 8MB Memory Module Kit (80ns) 64F3607 80386 Memory Expansion Adapter 72X6671 AC Adapter 79F0993 ActionMedia II Display Adapter 69F9731 ActionMedia II Capture Option 69F9735 ActionMedia II Video Cable 69F9737 ActionMedia II Audio/Video Capture Cable 69F9736 ActionMedia II Display CD-ROM Cable 69F9747 Carrying Case 79F3869 Communication Cable (for 79F0996) 94X1540 Data/Fax Modem (U.S., Canada only) 79F0996 Diskette Drive Bus Adapter 72X8524 Enhanced 5250 Emulation Adapter 64G3956 External Diskette Drive Adapter 72X6757 Game Control Adapter 8529151 PC Network Adapter 8286171 PC Network Adapter II 72X8105 PC Network Baseband Adapter 72X8101 PhoneCommunicator Adapter 33F4846 PhoneCommunicator Cable (Black-L) 57F1261 PhoneCommunicator Cable (Black-S) 57F1262 PhoneCommunicator Cable (Beige-L) 57F1263 PhoneCommunicator Cable (Beige-S) 57F1264 Printer Cable 8529214 Quick Charger 79F0995 Realtime Interface Coprocessor 6-Port V.35 72F0164 Screen Reader Adapter 33F4842 Screen Reader Keypad 1393515 Screen Reader Keypad Cable 72X8537 SCSI Adapter/A (with Cache) 85F0063 SCSI Adapter/A (without Cache) 85F0002 SCSI Cable (internal) 64F4127 SDLC Adapter 8286099 Serial Adapter 79F0998 Serial Adapter Cable 8286170 Serial Adapter Connector 8286194 Serial/Parallel Adapter 8286147 SpeechViewer Adapter 15F8511 Strap 07G1449 Token-Ring 16/4 Adapter 93F0334 Token-Ring Adapter 16F0463 Token-Ring Adapter (with RPL Module) 83X7839

Model L40 SX (8543) 45

Keyboard

Arabic 1396825 Belgian 1396812 Canadian French 1396810 Danish 1396813 Dutch 1396817 French 1396814 German 1396815 Greek 1396826 Hebrew 1396827 Icelandic 1396828 Italian 1396816 Norwegian 1396818 Portuguese 1396819 Spanish 1396820 Spanish Speaking 1396811 Swedish/Finish 1396821 Swiss/French 1396822 Swiss/German 1396823 Turkish 1396829 U.K. English 1396824 U.S. English 1396181

Numeric Keypad and Mouse

U.S. 1396182 Arabic 1396806 Canadian French 1396800 French 1396801 German 1396802 Greek 1396807 Italian 1396803 Spanish 1396804 Swedish/Finland 1396805 Swiss/French 1396809 Swiss/German 1396808 Trackpoint (Model L40 SX) 1397090

46 IBM Mobile Systems HMM - Volume 1

Model N45SL (2614)

General Checkout . . . . . . . . . . . . . . . . . 48

Symptom-to-FRU Index . . . . . . . . . . . . . . 53

Undetermined Problem . . . . . . . . . . . . . 62

Related Service Procedures ............ 63

Power-on Password . . . . . . . . . . . . . . 63

Status Indicators . . . . . . . . . . . . . . . . 63

How to Run Advanced Diagnostics ....... 63

Running PREP . . . . . . . . . . . . . . . . 64

Updating Flash Memory ............ 65

Product Overview . . . . . . . . . . . . . . . . . 66

FRU Removals and Replacements ......... 67

Locations . . . . . . . . . . . . . . . . . . . . . 70

Parts Listing . . . . . . . . . . . . . . . . . . . 71

 Copyright IBM Corp. 1995 47

General Checkout

Note: The hardware configuration in the Setup program is

the responsibility of the customer. However, some settings can cause symptoms of a hardware failure to appear during operation or diagnostic checkout. Setup affects power management, parallel and serial ports, disk drive operation, operating speed, boot source, and memory configuration. Refer to the

Guide to Operations

Setup.

001

HAS A REST/RESUME PROBLEM BEEN REPORTED? Yes No

002

Go to Step 010 on page 49.

003

1. Power-on the computer.

2. Make sure the power button is set up for REST/RESUME in Setup configuration.

3. Press the power button to put the computer into REST.

Note: LCD display and backlight off, all LEDs off (except

charge indicator when AC is connected and battery pack is installed).

DID THE COMPUTER REST? Yes No

for information about

004

Do the following:

 Replace the system board.  If that does not solve the problem, replace the

DC/DC board.

 If the problem remains, replace the top cabinet

assembly.

005

Press the power button to bring the computer out of REST.

DID THE COMPUTER FAIL TO RESUME? Yes No

006

Go to Step 010 on page 49.

007

(Step 007 continues)

48 IBM Mobile Systems HMM - Volume 1

007 (continued)

Check backup battery connections and voltage (+5 V dc).

ARE THE BACKUP BATTERY AND BATTERY CONNECTIONS OK? Yes No

008

Replace the battery and verify operation.

009

Do the following:

 Replace the system board.  If that does not solve the problem, replace the DC/DC

board.

 If the problem remains, replace the top cabinet

assembly.

010

1. Connect the AC adapter to the computer and to the AC supply.

2. Make sure there is no diskette in the diskette drive.

3. Disconnect any peripherals from the computer.

4. Power-on the computer.

IS THE POWER LED LIT? Yes No

011

Go to Step 029 on page 51.

012

IS THE POWER LED AMBER? Yes No

013

IS THE POWER LED GREEN? Yes No

014

Replace the top cabinet. If that does not solve the problem, replace the system board.

015

Replace FRUs in the following order:  AC Adapter

 DC/DC Board  System Board  Top Cabinet

Model N45SL (2614) 49

016

IS THE CHARGE LED LIT? Yes No

017

Replace FRUs in the following order:  AC Adapter

 Battery Pack

 Battery Contact Cable Assembly

 Top Cabinet

018

IS THE CHARGE LED RED? Yes No

019

DOES THE LCD DISPLAY TURN ON? Yes No

020

Adjust the brightness and contrast controls. If this does not correct the problem, return to Step 001.

(CONTINUED)

021

DOES THE COMPUTER BOOT FROM THE HARD DRIVE? Yes No

022

If you receive a POST error, go to the Symptom-to-FRU index. If you do not receive a POST error, go to “Undetermined Problem” on page 62.

023

IS THE BACKLIGHT ON? Yes No

024

Go to Step 029 on page 51.

025

(Step 025 continues)

50 IBM Mobile Systems HMM - Volume 1

025 (continued) IS THE DISPLAY READABLE? Yes No

026

Go to Step 029.

027

If you receive a POST error, go to the Symptom-to-FRU index. If you do not receive a POST error, go to “Undetermined Problem” on page 62.

028

Replace the battery contact cable assembly. If this does not correct the problem, replace the battery pack.

029

1. Disconnect the computer from AC power.

2. Remove the battery pack.

3. Open the computer and look for damaged or unconnected cables.

ARE THE CABLES OK? Yes No

030

Reconnect or replace the cables, then close the computer. Verify operation.

031

– Close the computer and install a freshly charged battery

pack. Power-on the computer.

DO ANY LEDS LIGHT? Yes No

032

Replace FRUs in the following order:  Top Cabinet

 DC/DC Board  System Board

033

DOES THE LCD BACKLIGHT LIGHT? Yes No

034

(Step 034 continues)

Model N45SL (2614)

034 (continued)

Replace FRUs in the following order:  DC/DC Board

 System Board

 LCD Display Panel

035

DOES THE COMPUTER ATTEMPT TO AUTOBOOT? Yes No

036

Replace FRUs in the following order:  Suspected Drive

 System Board

037

IS THE OPERATING SYSTEM PROMPT LEGIBLE? Yes No

038

Replace FRUs in the following order:

 Top Cabinet Assembly

 System Board

(CONTINUED)

039

Replace the system board.

52 IBM Mobile Systems HMM - Volume 1

Symptom-to-FRU Index

The Symptom-to-FRU Index lists the symptoms and errors and the possible causes. The most likely cause is listed first.

Note: Perform the FRU replacement or actions in the

sequence shown in the FRU/Action columns. If a FRU did not solve the problem, put the original part back in the computer. Do not replace a non-defective part.

This index can also be used to help you decide which FRUs to have available when servicing a computer.

Note

For IBM devices not supported by the N45 diagnostics, see the manual for that device.

Symptom/Error FRU/Action

No access to A or C drive after POST.

“CHECKSUM ERROR! Bad image file.

ERROR occurred while reading file.”

“Device error during erasing process.”

“Device error during programming process.”

“DISK ERROR: Bad disk controller!”

“DISK ERROR: Cannot reset drive!”

“DISK ERROR: CRC error!” 1. Diskette

“DISK ERROR: Data Corrected!”

1. Ensure boot

sequence is not set to “Monitor.”

1. Advanced

Diagnostics diskette

1. System Board

1. DC-to-DC board

2. System Board

1. Check disk drive

cable connection.

2. Diskette Drive Cable

1. Verify drive

installation.

2. Diskette Drive

3. System Board

2. Diskette Drive Cable

3. Run Advanced Diagnostics to test drive.

4. Diskette Drive

5. System Board

1. If this message

occurs regularly, see “DISK ERROR: CRC error!”

Model N45SL (2614) 53

Symptom/Error FRU/Action

“DISK ERROR: Disk not bootable!”

“DISK ERROR: DMA overrun!”

“DISK ERROR: Drive not ready!”

“DISK ERROR: Invalid address mark!”

1. Use a bootable

diskette.

2. For a hard disk, reinstall the operating system.

3. Back up the hard disk, if possible, and run PREP to reinitialize the disk (see “Running PREP” on page 64). Reformat disk and install operating system.

4. Hard Disk Drive

1. Diskette Drive

2. System Board

1. Remove and reinsert

diskette.

2. Verify the correct drive was specified.

3. Diskette Drive

1. If the problem is a

diskette:

a. Copy any

b. Diskette c. Diskette Drive

2. If the problem is a

hard disk:

a. Back up the hard

b. Hard Disk Drive

readable files to another diskette and reformat faulty diskette. If bad sectors are reported, discard the faulty diskette.

disk, if possible, and run PREP to reinitialize the disk (see “Running PREP” on page 64). Reformat disk and install operating system.

54 IBM Mobile Systems HMM - Volume 1

Symptom/Error FRU/Action

“DISK ERROR: Invalid data read!”

“DISK ERROR: Must run SETUP to boot from Winchester!”

“DISK ERROR: No bootable partitions”

1. If the problem is a

2. If the problem is a

1. Run Setup program

2. System Board

1. Retry the boot

2. Format partition and

diskette:

a. Copy any

readable files to another diskette and reformat faulty diskette. If bad sectors are reported, discard

the faulty diskette. b. Diskette c. Diskette Drive

hard disk:

a. Back up the hard

disk, if possible,

and run PREP to

reinitialize the disk

(see “Running

PREP” on

page 64).

Reformat disk and

install operating

system.

b. Hard Disk Drive

to specify correct hard disk drive type.

command syntax and verify a valid partition is selected using the DOS “FDISK” command.

install operating system using the DOS “FORMAT” command.

Model N45SL (2614) 55

Symptom/Error FRU/Action

“DISK ERROR: Sector not found!”

“DISK ERROR: Seek failure!”

“ERROR: Bad configuration information found in CMOS!”

“ERROR: Base memory size error: SETUP: XXXK ACTUAL: XXXK!”

“ERROR: Can't locate input file.”

“ERROR: CMOS memory failure!”

“ERROR: CPU failure!” 1. System Board

1. If the problem is a

diskette:

a. Copy any

readable files to another diskette and reformat faulty diskette. If bad sectors are reported, discard

the faulty diskette. b. Diskette c. Diskette Drive

2. If the problem is a

hard disk:

a. Back up the hard

disk, if possible,

and run PREP to

reinitialize the disk

(see “Running

PREP” on

page 64).

Reformat disk and

install operating

system.

b. Hard Disk Drive

1. Copy any readable

files to another diskette and format the faulty diskette.

2. If bad sectors are reported, discard the faulty diskette.

3. Diskette

4. Diskette Drive

5. System Board

1. Run Setup program

to reconfigure.

2. Backup Battery

3. System Board

1. Run Setup program

to verify correct base memory size.

2. Run the Advanced Diagnostics Memory Test to check base memory.

3. System Board

1. Correct Advanced

Diagnostics diskette?

2. Advanced Diagnostics diskette

1. Run Setup program

to verify configuration.

2. System Board

56 IBM Mobile Systems HMM - Volume 1

Symptom/Error FRU/Action

“ERROR: Divide by zero!” 1. Try another copy of

“ERROR: Extended memory size error! SETUP: XXXK ACTUAL: XXXXK”

“ERROR: File too long for program buffers.”

“ERROR: File too long for ROM size.”

“ERROR: File too short to fill ROM.”

the software, or have the customer contact the software manufacturer or dealer and report the problem. Unless this message occurs during the power-up sequence, the problem is with the software.

2. Power-off computer, wait 15 seconds, then power-on computer. If the message reappears, replace system board.

1. Run Setup program

to verify the extended RAM memory size matches the memory installed.

2. Check the memory module installation.

3. Run Advanced Diagnostics to test extended memory. If you cannot boot the computer, replace the system board and try again. If the tests identify an expansion memory module, replace it. If the tests identify a problem in the base memory, replace the system board.

1. Correct Advanced

Diagnostics diskette?

2. Advanced Diagnostics diskette

1. Correct Advanced

Diagnostics diskette?

2. Advanced Diagnostics diskette

1. Correct Advanced

Diagnostics diskette?

2. Advanced Diagnostics diskette

Model N45SL (2614) 57

Symptom/Error FRU/Action

“ERROR: Invalid command!”

“ERROR: Keyboard not responding or not connected!”

“ERROR: Memory parity failure!”

“ERROR occurred while reading Boot Sector.”

“ERROR occurred while reading FAT table.”

“ERROR occurred while reading root directory.”

“ERROR: Please replace the backup battery!”

“Error programming FLASH Device. Retrying.”

“ERROR: RAM failure! Address: XXXX”

“ERROR: RAM failure! SIMM module: XXXX”

1. Retry the command.

2. Try another copy of the software or have the customer contact the software manufacturer or dealer and report the problem.

3. System Board

1. Check keyboard

connections.

2. Keyboard

3. System Board

1. Run Advanced

Diagnostics Memory Test to check base and extended memory.

2. Memory Module

3. System Board

1. Advanced

Diagnostics diskette

1. Advanced

Diagnostics diskette

1. Advanced

Diagnostics diskette

1. If backup battery was recently replaced, run Setup program to configure computer.

2. Backup Battery

3. System Board

1. System Board

1. Inspect memory

modules for proper installation.

2. Swap the installed memory modules with known good modules.

3. Memory Board

4. System Board

1. Inspect the memory

modules for proper installation.

2. Swap the installed memory modules with known good modules.

3. Memory Board

4. System Board

58 IBM Mobile Systems HMM - Volume 1

Symptom/Error FRU/Action

“ERROR: ROM checksum failure!”

“ERROR: System control processor failure!”

“ERROR: The image file is not for this machine.”

“ERROR: Timer interrupt failure!”

“ERROR: Wild Hardware Interrupt.”

“Fatal Error; Cannot Continue!”

“File not found, try another diskette.”

“FLASH Device failure! Device content has been corrupted.”

“High ROM Checksum Error! Flash ROM needs to be reprogrammed”

1. Power-off computer,

1. Correct Advanced

2. Advanced Diagnostics

1. Power-off computer,

2. If message reoccurs at

3. System Board

1. Refer to first error

1. Try another

1. System Board

1. BIOS within the Flash

wait 15 seconds, then power-on computer. If the message reappears, replace system board.

wait 15 seconds, then power-on computer. If message reappears, replace system board.

Diagnostics diskette?

diskette

wait 15 seconds, then power-on computer. If message reappears, replace system board.

wait 15 seconds, then power-on computer. Rerun the program.

the same place during operation of a program, it is probably software related. Have the customer contact the software manufacturer or dealer to report problem.

message and follow instructions to resolve the problem.

Advanced Diagnostics diskette.

ROM is corrupt. The

NEWBIOS command will automatically be executed. See “Updating Flash Memory” on page 65.

Model N45SL (2614) 59

Symptom/Error FRU/Action

“Low ROM Checksum Error! Flash ROM needs to be reprogrammed”

“Non-maskable interrupt received!”

“No system” 1. Install the operating

“Not a bootable partition” 1. Retry the boot

“Overflow!” 1. Power-off computer,

1. See “Updating Flash

Memory” on page 65.

1. If a software problem is suspected, have the customer contact the software manufacturer or dealer and report the problem.

2. Run Advanced Diagnostics.

3. AC Adapter

system. Refer to the operating system documentation for instructions.

2. Retry the boot command syntax and verify a valid drive was selected.

command syntax and make certain a valid partition was selected.

2. Back up the hard disk, if possible, and run PREP to reinitialize the disk (see “Running PREP” on page 64). Reformat disk and install operating system.

3. Hard Disk Drive

wait 15 seconds, then power-on computer. If message reappears during power up, replace system board.

2. If a software problem is suspected, try another copy of the program, or have the customer contact the software manufacturer or dealer and report the problem.

60 IBM Mobile Systems HMM - Volume 1

Symptom/Error FRU/Action

“Password Security Violation: System Shutdown”

“Program verify failure.” 1. System Board “Remove diskette and insert

again, otherwise reboot.”

“Retries exhausted, please remove diskette.”

“Slush BIOS Checksum Error!”

“Slush RAM Data Error!” 1. System Board “Slush Video Checksum

Error!” “Wild Interrupt!” 1. Power-off computer,

1. Power-off computer,

wait 15 seconds, then power-on the computer.

2. Retry the password. If password is unknown, clear the password (see “Power-on Password” on page 63).

1. Try another

Advanced Diagnostics diskette.

2. System Board

1. Try another

Advanced Diagnostics diskette.

2. System Board

1. System Board

wait 15 seconds, then power-on computer. Rerun the program.

2. If the message reoccurs at the same place during the operation of a program, it is probably software related. Have the customer contact the software manufacturer or dealer to report problem.

3. If the message reoccurs randomly, run Advanced Diagnostics. Replace any faulty assemblies.

Model N45SL (2614) 61

Undetermined Problem

You are here because the diagnostics tests did not identify the failing FRU.

1. Power-off the computer and remove the battery packs from the computer.

2. Remove or disconnect one of the following devices or adapter (do not isolate FRUs that are known to be good). a. Non-IBM devices

b. Modem, printer, mouse, or other external device

c. IC DRAM card d. Hard disk drive (fixed disk drive) or diskette drive e. Any adapter and device.

3. Power-on the computer and start the system program.

4. If the symptom remains, repeat steps 2 and 3 until you find the failing FRU or until all FRUs have been removed.

5. If all of the FRUs listed have been removed and the problem remains, replace the system board.

62 IBM Mobile Systems HMM - Volume 1

Related Service Procedures

This section provides related service information on the following:

“Power-on Password” “Status Indicators” “How to Run Advanced Diagnostics” “Running PREP” on page 64 “Updating Flash Memory” on page 65

Power-on Password

Important

This information is not available in this HMM online format. See your IBM Servicer or IBM Authorized Dealer for this procedure.

Status Indicators

Light Status Indicated

Hard disk drive is active Diskette drive is active Keyboard is in Caps Lock mode Keyboard is in Num Lock mode Imbedded keypad is locked on Keyboard is in Scroll Lock mode

Amber Computer is operating

Green Computer is operating

Red (flashing) Battery pack is almost

Red (steady) Battery pack is

Green Battery pack is fully charged

Amber Battery pack is being fast

Red Problem in the battery circuit Off Computer is operating from

from AC power

from battery power

discharged

completely discharged

and being trickle charged

charged

AC with no battery pack installed

How to Run Advanced Diagnostics

1. Power-off the computer.

2. Insert the Advanced Diagnostics Diskette into the diskette drive.

3. Power-on the computer.

Model N45SL (2614)

4. Press Ctrl+Alt+Ins to start the Monitor program.

5. In the Monitor program, type BF and press Enter to boot from the diskette drive.

6. Follow the Advanced Diagnostics menus to test the computer. (Press F1 for help.)

Running PREP

The PREP utility initializes and prepares the hard disk surface for storage of data. It performs a low level format then checks for bad sectors. If any bad sectors are found, they are marked in a way that prevents data from being stored in them.

There are two situations when PREP is used:

1. To prepare the hard disk surface for formatting when installing a new hard disk drive.

2. To exclude sectors of the hard disk that have become unusable, indicated by intermittent or continuous hard disk drive read failures.

Warning: PREP erases all data on the hard disk. If possible, back up the data on the hard disk to diskettes before running PREP.

To run PREP:

1. Boot the Advanced Diagnostics diskette.

2. Press the right arrow key to select the “Run Tests” menu.

3. Press the down arrow key to select “Advanced Utilities” from the menu and press Enter.

4. Select “PREP” and press Enter.

PREP displays its version number, a list of informational messages, and then asks if you want to proceed.

Do you want to proceed with PREP (Y/N)?

Press N if you want to cancel PREP and return to the DOS command line. Press Y to continue with PREP.

PREP asks for the hard disk drive unit number (drive C = 0 and D = 1).

Hard disk drive unit number (0 - 7):

Enter the drive number. You will then be offered one more chance to cancel PREP. PREP will prompt you to press P to continue. Pressing any other key will cancel PREP and return you to the DOS prompt.

PREP first scans the hard disk for bad sectors that have previously been marked. It displays the message:

Scanning for previous bad sectors...

PREP then performs a low level format of the hard disk surface. It display the message:

64 IBM Mobile Systems HMM - Volume 1

Initializing the disk...

PREP will then write data to each sector of the hard disk and read this data back to verify each sector. This is repeated four times. PREP displays the message:

Verify: pass n, Cylinder xxx

Where n is the number of the current pass (1-4) and the current cylinder under test.

If any bad sectors are found, PREP marks them to prevent them from being used when the hard disk is formatted.

After the hard disk is verified, PREP displays the message:

xxx

Operation complete, press any key to exit to monitor

The hard disk is now ready to be formatted and have an operating system loaded onto it.

Updating Flash Memory

Note on Updating Flash Memory

Perform this NEWBIOS function only while operating on AC power.

Reprogramming Flash BIOS: To reprogram the

Flash ROM, do the following.

1. Access the Monitor program with the Ctrl+Alt+Ins key combination.

2. Insert the Advanced Diagnostics diskette in the diskette drive.

3. Type NEWBIOS, then press Enter.

The NEWBIOS function tests the size of the file, the computer type, and the checksum of the file. After the tests complete successfully, the Flash ROM is reprogrammed. The following prompt appears:

Programming success. Press

In order for the computer to read the new code, the computer must be rebooted. Press Enter to reboot the computer.

If the NEWBIOS function fails and displays any error messages, power-off computer, wait 15 seconds, then power-on computer. If the Flash ROM is corrupt, the computer will initiate the NEWBIOS function automatically.

Enter

to reboot system...

Model N45SL (2614)

Product Overview

The following table provides a brief overview of the computer features.

Feature Description

Processor (MHz) 386SL 25-Mhz Bus Architecture AT Bus Memory (Standard) 2MB Memory (Maximum) 8MB Video VGA Diskette Drive 3.5-inch Hard Drive 120MB

66 IBM Mobile Systems HMM - Volume 1

FRU Removals and Replacements

Safety Notice 8: Translation on page 13

Before removing any FRU, power-off the computer, unplug all power cords from electrical outlets, remove the battery pack, then disconnect any interconnecting cables.

Safety Notice 1: Translation on page 7

.1/ Battery Pack

.2/ Three Screws (1-G, 2-J)

(Two on bottom of cabinet near front, one inside battery compartment)

Loosen Keyboard

.3/ Two Ribbon Cables and Remove Keyboard

.4/ Hinge Covers

(Apply pressure to hinge cover sides and pull up.)

.5/ Memory Module Cover

(Gently pry from rear.)

.6/ Three Screws (1-J, 2-WW)

(One screw at each hinge and one at back edge under memory module cover.)

.7/ Three LCD Assembly Cables

(These cables attach to underside of LCD assembly. Observe cable routing and place cables in same position when replacing top cover.)

.8/ Three Screws and LCD Assembly

(Top cover is part of LCD assembly. Only part of LCD is shown. Long silver screws are located at front edge of LCD assembly.)

.9/ Two Screws (J)

(At front edge of diskette drive)

.1ð/ Diskette Drive Ribbon Cable .11/ Diskette Drive .12/ Three Screws (J)

(Move shielding aside. Do not crease shielding.)

Model N45SL (2614)

.13/ Memory Module Expansion Card .14/ Hard Disk Drive Ribbon Cable .15/ Hard Disk Drive

(One screw on cabinet bottom holds hard disk drive in place. Have customer backup hard disk drive before removing drive. Run Prep after installing new hard disk drive.)

.16/ Two Screws (J)

(At each end of memory module support bracket)

.17/ Memory Module Support Bracket .18/ Backup Battery, Battery Compartment Cables

(Look for .18/ twice in illustration.)

.19/ Two Screws (J)

(At each end of DC to DC PCB Assembly)

.2ð/ DC to DC PCB Assembly

(Lift front to unplug assembly from system board. Be careful not to damage or lose shielding.)

.21/ Modem Ribbon Cable .22/ Three Modem Housing Screws (J)

(Front right screw holds a black grounding cable down.)

.23/ Modem Housing Assembly .24/ Mouse Cable .25/ One System Board Screw (J) .26/ Three System Board Threaded Hex Spacers .27/ Cable .28/ System Board

(Transfer math coprocessor (if installed) to new system board.)

.29/ Backup Battery

68 IBM Mobile Systems HMM - Volume 1

Model N45 Exploded View

Model N45SL (2614) 69

Locations

System Board

.1/ External Display Connector .2/ Parallel Connector .3/ Serial Connector .4/ Memory Adapter Card Connector .5/ Auxiliary Device Connector .6/ Hard Disk Drive Connector .7/ Diskette Drive Connector .8/ Status Light Panel Connector .9/ Keyboard Connectors

.1ð/ LCD Connector .11/ Modem Connector Jack

DC to DC Board (Top)

.12/ AC Adapter Connector .13/ Backup Battery Connector .14/ Battery Pack Connector .15/ Battery Status Indicator Connector

DC to DC Board (Bottom)

.16/ System Board Connector

70 IBM Mobile Systems HMM - Volume 1

Parts Listing

Model N45SL (2614) 71

System Unit

Index 1 Top Cabinet Assembly 92F8858

French 92F8839 German 92F8837 Italian 92F8845 Spanish 92F8838 U.K. English 92F8836 U.S. English 92F8835

3 Power Cord, US 6952301 3 Power Cord, UK 14F0033 3 Power Cord, Switzerland 14F0051 3 Power Cord, Europe 13F9979 7 System Board 92F8827 8 PS/2 Mouse Board 92F8833 9 Bottom Cover Assembly 92F8819 10 Parts Package, Cover 92F8825

(Left/right LCD hinge covers, memory expansion cover, memory cover, modem door door, coprocessor door, rear I/O cover, modem cover plug, modem door, coprocessor door, black lid switch knob) Battery Pack 92F8840

13 Backup Battery 92F8834

Battery Contact Assembly 92F8841

14 DC to DC PCB Assembly 92F8820

Speaker 33G9475 Parts Package, Screws 92F8824 (3-2.5x4; 3-2.5x12; 2-2.6x6 (tap); 3-2.6x6; 5-2x6 (tap); 3-2.5x4; 11-2.5x6)

DASD

5 Diskette Drive 92F8821 6 80MB Hard Disk Drive 92F8822 6 120MB Hard Disk Drive 33G6366

Options and Adapters

4 AC Adapter 92F8832

Modem, 2400 BPS, US 92F8846

12 Modem Housing Assembly 92F8826

Fax/Modem, US 92F8896 Fax/Modem, Worldwide 92F6293 Fax/Modem DAA Adapter, US 92F8847 Fax/Modem DAA Adapter, UK 92F8848 Fax/Modem DAA Adapter, Danish 92F8849 Fax/Modem DAA Adapter, French 92F8850 Fax/Modem DAA Adapter, German 92F8851 Fax/Modem DAA Adapter, Italian 92F8852 Fax/Modem DAA Adapter, Norwegian 92F8853 Fax/Modem DAA Adapter, Spanish 92F8854 Fax/Modem DAA Adapter, Swedish 92F8855 Fax/Modem DAA Adapter, Swiss 92F8856

16 Expansion Memory Module 92F8823 15 Memory Module Support (part of P/N 92F8823)

72 IBM Mobile Systems HMM - Volume 1

Model N51 (8551)

General Checkout . . . . . . . . . . . . . . . . . 74

Memory Checkout . . . . . . . . . . . . . . . 77

Power Systems Checkout ........... 78

Symptom-to-FRU Index . . . . . . . . . . . . . . 87

Numeric Error Codes .............. 87

Beep Symptoms . . . . . . . . . . . . . . . . 91

Miscellaneous Symptoms . . . . . . . . . . . 91

Undetermined Problem . . . . . . . . . . . . . 94

Related Service Procedures ............ 95

Checking Installed Devices ........... 95

Power-on Password . . . . . . . . . . . . . . 96

How to Run the Advanced Diagnostics ..... 96

Hard Disk Partition ............... 96

Restoring the Partition ............. 97

Setting System Configuration .......... 97

Product Overview (N51 SX) ............ 98

Product Overview (N51 SLC) ........... 98

FRU Removals and Replacements ......... 99

Locations . . . . . . . . . . . . . . . . . . . . 103

Parts Listing . . . . . . . . . . . . . . . . . . 105

General Checkout

The diagnostic tests are intended to test products. Non-IBM products, prototype cards, or modified options can give false errors and invalid computer responses.

001

DOES THE PROBLEM APPEAR TO BE A POWER SUPPLY FAILURE? Yes No

002

Go to Step 006.

003

DO ALL SYSTEM-STATUS INDICATORS REMAIN OFF? Yes No

004

Go to Step 006.

005

Go to “Power Systems Checkout” on page 78.

only

IBM

006

– Power-off the computer and all external devices. – Check all cables and power cords. – Make sure no diskette is in the drive. – Power-on all external devices. – Power-on the computer and check for the following

responses:

1. All system-status indicators appear once for about 1 second.

Note: Some indicators remain on and others go

off after 1 second.

2. Memory test (the number increases.)

3. One or two short beeps.

DID YOU RECEIVE THE RESPONSES LISTED ABOVE? Yes No

007

1. If the memory count is incorrect, go to “Memory Checkout” on page 77.

2. Go to “Symptom-to-FRU Index” on page 87. If that does not correct the problem, go to “Undetermined Problem” on page 94.

74 IBM Mobile Systems HMM - Volume 1

008

– Press Ctrl+Alt+Del. When the cursor moves to the

upper right, press Ctrl+Alt+Ins to start the system program. If the IBM logo screen does not appear, insert the backup Reference Diskette into the diskette drive and repeat this step.

1. If you are not at the Main Menu, follow the instructions on the screen to advance to the Main Menu.

If you cannot advance to the Main Menu, go to “Symptom-to-FRU Index” on page 87.

- or If that does not correct the problem, go to “Undetermined Problem” on page 94.

Notes:

a. If the computer has an incorrect keyboard or

numeric keypad response, go to “External Keyboard/Auxiliary Input Device Checkout” on page 465.

b. If the printer has incorrect responses, go to

“Printer Checkout” on page 468.

c. If the external display has problems such as

jittering, rolling, shifting, or being out-of-focus, go to “External Display Self-Test” on page 464.

2. Press Ctrl+A and run the system checkout.

IS THE LIST OF INSTALLED DEVICES CORRECT? Yes No

009

Go to “Checking Installed Devices” on page 95.

010

– Run the diagnostic tests.

DID THE TEST IDENTIFY A FAILURE? Note: If the test stops and you cannot continue, replace

the last device tested.

- or If any POST error code appears, go to “Symptom-to-FRU Index” on page 87.

Yes No

011

You might have an intermittent problem:

 Check for damaged cables and connectors.  Reseat all adapters, drives, and modules.

(Step 011 continues)

Model N51 (8551) 75

011 (continued)

 Start an error log and run the tests multiple

times.

 Check the power supply in use when the error

is reported (see “Power Systems Checkout” on page 78).

 Check “Symptom-to-FRU Index” on page 87. If

this does not fix the problem, go to “Undetermined Problem” on page 94.

012

Go to “Symptom-to-FRU Index” on page 87.

(CONTINUED)

76 IBM Mobile Systems HMM - Volume 1

Memory Checkout

Customer diagnostics can eliminate defective memory so no memory error code appears at power-on reset. After you replace a defective memory module kit, run 5. Automatic configuration or the new memory will not be recognized. (If you have to run configuration with your own diskette, be sure the customer has all the correct option diskettes available.) Power-off the computer before removing or replacing parts.

001

– Remove the memory module kit in the connector if

installed.

– Run the memory tests.

Use the RUN TESTS ONE TIME option.

DID THE MEMORY TESTS END WITHOUT AN ERROR? Yes No

002

Replace the system board.

003

DID YOU REMOVE THE MEMORY MODULE KIT IN THE CONNECTOR? Yes No

004

Go to Step 007.

005

– Reinstall the memory module kit in the connector and

run 5. Automatic configuration.

– Run the memory test.

Use the RUN TESTS ONE TIME option.

DID THE MEMORY TESTS END WITHOUT AN ERROR? Yes No

006

Replace the memory module kit in the connector. If that does not correct the problem, replace the system board.

007

If the problem occurs intermittently, run the memory tests multiple times to have an error log.

Model N51 (8551) 77

Power Systems Checkout

Note

One or all of the batteries can discharge if there is a short circuit in the computer.

1. Replace the failing FRU if the power supply problem is caused by a short circuit.

2. Determine if one (or all) of the batteries have become discharged. Replace a discharged battery with a known-good spare.

The test procedures for each power supply are found on the following pages.

“Testing the AC Adapter” on page 81. “Testing the Battery Pack” on page 82. “Testing the Backup Battery” on page 83. “Testing the Standby Battery” on page 83. “Testing the Quick Charger” on page 84. “Testing the Car Battery Adapter” on page 85. “Testing the Voltage Converter” on page 85.

None of the above? Follow the steps below.

001

DID THE PROBLEM OCCUR ONLY WHEN USING THE AC ADAPTER? Yes No

002

Go to Step 004.

003

Go to “Testing the AC Adapter” on page 81. If “Testing the AC Adapter” does not correct the problem, replace the voltage converter.

004

DID THE PROBLEM OCCUR ONLY WHEN USING THE CAR BATTERY ADAPTER? Yes No

005

Go to Step 007.

006

Go to “Testing the Car Battery Adapter” on page 85.

007

(Step 007 continues)

78 IBM Mobile Systems HMM - Volume 1

007 (continued) DID THE PROBLEM OCCUR ONLY WHEN USING THE BATTERY? Yes No

008

Go to Step 014.

009

DOES A FULLY-CHARGED BATTERY DISCHARGE QUICKLY? Yes No

010

Go to Step 013.

011

– Run advanced diagnostics for all devices using the AC

adapter. Use the ‘RUN TEST ONE TIME’ option.

DID ALL THE TESTS END WITHOUT AN ERROR? Yes No

012

Follow the instructions on the screen. If the instructions do not appear or do not correct the problem, replace the system board.

013

Go to “Testing the Battery Pack” on page 82. If “Testing the Battery Pack” does not correct the problem, go to “Testing the Voltage Converter” on page 85.

014

– Unplug the AC adapter if used. – Remove the bottom cover and disconnect the flat cable

from connector CN6 on the voltage converter. (See page 86 for the connector location.)

– Check that the resistance at connector CN5 is greater

than 5 ohms between pins 7 and 1, and also between 7 and 3.

IS THE RESISTANCE CORRECT? Yes No

015

Go to Step 017 on page 80.

016

Go to “Testing the Voltage Converter” on page 85. If “Testing the Voltage Converter” does not correct the problem, go to Step 017 on page 80.

Model N51 (8551)

(CONTINUED)

017

– Remove the following if installed:

 Battery pack  Standby battery  Backup battery

 Memory module kit  Internal Data/Fax modem

 Serial adapter  Numeric keypad  Mouse  External display

 Hard disk drive

 Diskette drive

 LCD inverter cable  LCD panel cable.

– Make sure the voltage converter is correctly installed. – Plug in the AC adapter and power-on the computer.

DID YOU HEAR ONE LONG OR TWO SHORT BEEPS? Yes No

018

Replace the following FRUs one at a time until the problem is corrected.

 Voltage converter

 I/O panel assembly

 System board

019

Replace the voltage converter to verify the fix. If the problem still remains, do the following. – Suspect one of the options or devices. Reinstall each of

the options or devices to the computer one at a time, and power-on the computer to see if the original problem occurs.

– Replace the last installed option or device when the

problem occurs.

80 IBM Mobile Systems HMM - Volume 1

Testing the AC Adapter: If the Power-On

indicator is not on, check the power cord of the AC adapter for proper installation and continuity.

1. If any noise can be heard from the AC adapter when it is plugged into line voltage, replace the AC adapter with a new one.

If no noise can be heard from the adapter, go to Step

2. If the noise still comes from the new AC adapter, suspect the computer. Replace the AC adapter with the original one, then go to the next step. If no noise comes from the new adapter, the original adapter has the problem.

3. Unplug the AC adapter cable from the computer and measure the output voltage at the plug of the AC adapter cable.

Pin Voltage (V dc)

1 +19.0 to +21.0 2 Ground

 If the voltage is not correct:

1. Unplug the AC adapter from the ac power outlet and leave it for a few minutes.

2. Plug the AC adapter into the ac outlet.

3. Measure the output voltage of the AC adapter.

4. If the voltage is still not correct, replace the AC adapter.

 If the voltage is OK, plug the cable into the computer

and try the failing operation again.

If the problem still remains, replace the voltage converter. If the problem disappeared, suspect the installation and continuity of the AC adapter cable.

Model N51 (8551) 81

Testing the Battery Pack

1. Place the computer bottom-side up.

2. Remove the battery pack and measure the voltage at the battery terminals between 1 (+) and 3 (−).

1(+)

2(T)

3( )

Pin Voltage (V dc)

1 +8.5 to +18.0 2 Thermal Detection 3 Ground

 If the voltage is less than +8.5 V dc, the battery

pack is discharged or defective.

 If the voltage is more than +8.5 V dc, go to the

next step.

3. Using a low-power ohm meter, measure the resistance at the battery terminals between 2 (T) and 3 (−). The resistance must be 4 kilohms to 30 kilohms. If the resistance is out of range, replace the battery pack.

4. Remove the bottom cover and set the battery pack in place without connecting any external power devices.

5. Measure the voltage at the connector between terminals 1 (+) and 3 (−) on the voltage converter and note the voltage.

1(+)

3( )

6. Using the AC adapter, apply external power to the computer.

Warning: Be careful not to cause a short circuit while doing the following steps. The charging circuit is active even if the computer power switch is set to off.

7. Measure the voltage again between terminals 1 (+) and 3 (−).

 If the voltage is not greater than that measured

in Step 5, replace the AC adapter, then go to the next step.

 If the voltage is greater than that measured in

Step 5, the battery pack is good.

82 IBM Mobile Systems HMM - Volume 1

 Repeat Steps 6 and 7 using a new AC adapter.

If the voltage is still not greater than that measured in Step 5, replace the voltage converter.

Testing the Backup Battery

1. Place the computer bottom-side up.

2. Remove the bottom cover.

3. Disconnect the battery connector from the voltage converter.

4. Measure the voltage of the backup battery.

(Black)

+(Red)

Wire Voltage (V dc)

Red +2.5 to +3.7 Black Ground

If the voltage is correct, replace the system board. If it is not, the backup battery is discharged by a short circuit or is defective.

Testing the Standby Battery

1. Place the computer bottom-side up.

2. Remove the battery pack from the computer and remove the bottom cover.

3. Disconnect the battery connector from the voltage converter.

4. Plug the AC adapter into the computer and power-on the computer.

5. Measure the output voltage at the connector on the voltage converter.

Model N51 (8551) 83

+ (Red)

- (Black)

Pin Voltage (V dc)

1 +4 3 Ground

 If the voltage is less than +4 V dc, replace the

voltage converter.

 If the voltage is greater than +4 V dc, go to the

next step.

6. Power-off the computer.

7. Reconnect the standby battery to the voltage converter.

8. Power-on the computer and leave it approximately 30 minutes to allow the standby battery to be charged.

9. Power-off the computer again and disconnect the standby battery.

10. Measure the voltage of the standby battery.  If the voltage is less than 3.5 V dc, replace the

standby battery.

 If the voltage is greater than 3.5 V dc, replace

the voltage converter.

Testing the Quick Charger: If an unusual noise

can be heard from the operating quick charger, replace it.

1. Perform steps 1 through 3 on page 82 of the “Testing the Battery Pack” to verify the battery pack is operating correctly.

2. Connect the power cord to the quick charger and the other end to the electrical outlet. Ensure that the power indicator turns on.

If the power indicator does not turn on, check the power cord of the quick charger for proper installation and continuity. If this does not correct the problem, replace the quick charger.

3. Install the battery pack. If the charging indicator does not start blinking,

replace the quick charger.

84 IBM Mobile Systems HMM - Volume 1

Testing the Car Battery Adapter: If an output

voltage from a cigarette lighter socket is less than 10.5 V dc, the power-on indicator on the car battery adapter blinks and a noise can be heard continuously. The battery of the car is defective.

1. Unplug the car battery adapter from the computer if connected.

2. Plug the car battery adapter into the cigarette lighter socket.

Note: If the adapter is already plugged in, be sure to

unplug the adapter from the cigarette lighter socket, then plug it into the socket again.

3. Measure the output voltage of the car battery adapter.

Pin Voltage (V dc)

1 +19.0 to +21.0 2 Ground

If the voltage is correct and the power-on indicator on the car battery adapter is on steady, the car battery adapter is working correctly.

If the voltage is out of range, do one of the following.

 Try the above test procedures in another car if

available.

 Replace the car battery adapter if the computer

works with the AC adapter and does not work with the car battery adapter.

Testing the Voltage Converter: Use the

following procedure to isolate the voltage converter from the problem.

Note: If the problem occurs only when using the

computer with a good battery pack, replace the voltage converter.

1. Power-off the computer.

2. Power-off all attached devices and disconnect them from the computer.

3. Unplug the AC adapter from the computer.

4. Remove the battery pack and the bottom cover.

5. Disconnect the standby-battery connector and the flexible cable from connector CN6 on the voltage converter.

6. Power-off the computer.

7. Plug the AC adapter into the computer.

Model N51 (8551) 85

Important

The computer goes into suspend mode in about 20 seconds after plugging in the AC adapter. The following procedure must be performed during this period. If the computer is already in suspend mode, unplug the AC adapter and plug it in again to reactivate it.

8. Check the voltages of the voltage converter using the following table.

CN8

CN7

CN5

40 39

CN6

Connector

CN5 1

CN7 2

Pin Signal V dc

3 7, 8 9, 10 13 21 32

23, 24

VCCA VCCB GND GND +20 V dc POWER_GD POWER_ON#

VCCG GND

Min.

+4.9 +4.7

– –

+19.0 +4.0

0 +4.7

–

V dc Max.

+5.3 +5.3

– –

+21.0 +5.3 +0.5

+5.3

–

 If all the voltages are correct, the voltage converter is

good.

 If +20 V dc is not correct, check the output voltage of

the AC adapter (see “Testing the AC Adapter” on page 81). If the voltage is correct, replace the voltage converter.

 If any of the measured voltages except +20 V dc is

not correct, replace the following FRUs one at a time to correct the problem.

1. Voltage converter

2. System board

3. I/O panel assembly

Note: Reconnect the standby-battery connector and the

flexible cable that were removed in Step 5 on page 85 before leaving this procedure.

86 IBM Mobile Systems HMM - Volume 1

Symptom-to-FRU Index

The Symptom-to-FRU Index lists error symptoms and possible causes. The most likely cause is listed first. Always begin with “General Checkout” on page 74. This index also can be used to help you decide which FRUs to have available when servicing a computer.

If you are unable to correct the problem using this index, go to “Undetermined Problem” on page 94.

IMPORTANT:

1. If you have both an error message and an incorrect audio response, diagnose the error message first.

2. If you cannot run the advanced diagnostics tests, but did receive a POST error message, diagnose the POST error message.

3. If you did not receive an error message, look for a description of your error symptoms in the first part of this index.

4. Check all power supply voltages before you replace the system board. (See “Power Systems Checkout” on page 78.)

5. If an error message is not listed, there is a device installed that requires an additional diskette or service manual. Refer to the diskette or service manual for that device.

How to Read POST Error Messages

POST error messages are displayed on the screen as 3, 4, 5, or 8 digits. The error messages that can be displayed as shorter POST messages are highlighted in this Symptom-to-FRU Index.

In the following index, an

in an error message can be

any number.

Numeric Error Codes

Symptom/Error FRU/Action

00010200, 00010300, 00010400, 00010700

00010800 1. System Board

00011000 (See “Memory Checkout” on page 77 before replacing any FRUs.)

000113XX 1. System Board

Model N51 (8551) 87

1. System Board

2. Communications Cartridge

1. Memory Module Kit

2. System Board

2. Communications Cartridge

3. Any Drive

Symptom/Error FRU/Action

000114XX 1. Communications

000118XX 1. Memory Module Kit 00016100 1. See “Testing the

00016300, 00016400, 00016500, 00016900 (If setting configuration does not solve the problem, see “Checking Installed Devices” on page 95.)

000166XX 1. Communications

000171XX, 000172XX 1. System Board 00017300 1. See “Testing the

00017400 (If Automatic Configuration does not solve the problem, run Advanced Diagnostics.)

00019000, 000191XX 1. System Board 00019200 1. Lid Switch

00019300 1. System Board 000199XX 1. System Board 0001XXXX

(not listed above)

0002XXXX (See “Memory Checkout” on page 77 before replacing any FRUs.)

00030100, 00030500 (Always power-on the computer before external any external device.)

00030200, 00030300, 00030400

Cartridge

Battery Pack” on page 82.

2. System Board

3. Voltage Converter

1. Set Configuration

2. System Board

3. Communications Cartridge

4. Hard Disk Drive

5. Memory Module Kit

Cartridge

Battery Pack” on page 82.

2. System Board

3. Voltage Converter

1. Set Configuration

2. Keyboard Control Card

3. System Board

1. System Board

2. Communications Cartridge

3. I/O Panel Assembly

1. Memory Module Kit

2. System Board

1. Keyboard Control

Card

2. System Board

3. Keyboard

4. Numeric Keypad

1. System Board

2. Keyboard Control Card

3. Keyboard or Numeric Keypad

88 IBM Mobile Systems HMM - Volume 1

IBM thinkpad doo schematic

Specifications and Main Features

Frequently Asked Questions

User Manual

About This Manual

Related Publications

Related Diskettes

Contents

Important Service Information

Model L40 SX (8543)

General Checkout

Memory Checkout

Power Systems Checkout

Symptom-to-FRU Index

Undetermined Problem

Power-on Password

How to Run Advanced Diagnostics

Product Overview

FRU Removals and Replacements

Locations

System Board

Parts Listing

Options and Adapters

Model N45SL (2614)

General Checkout

Symptom-to-FRU Index

Undetermined Problem

Related Service Procedures

Power-on Password

Status Indicators

How to Run Advanced Diagnostics

Running PREP

Updating Flash Memory

Product Overview

FRU Removals and Replacements

Locations

Parts Listing

Model N51 (8551)

General Checkout

Memory Checkout

Power Systems Checkout

Symptom-to-FRU Index

Numeric Error Codes