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IBM ThinkPad T21

IBM ThinkPad T21
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IBM Mobile Systems
ThinkPad Computer
Hardware Maintenance Manual
April 2002
This manual supports:
ThinkPad T20, T21, T22, T23
(MT 2647/2648)
ThinkPad Dock (MT 2631)


Table of Contents

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IBM ThinkPad T21 Specifications

General IconGeneral
ProcessorIntel Pentium III
Display14.1 inches
Resolution1024x768 (XGA)
Hard Drive10 GB - 32 GB
Optical DriveCD-ROM
Operating SystemWindows 2000
Weight5.1 lbs (2.3 kg)
NetworkingEthernet, Modem
Ports2 x USB 1.1, VGA, Parallel, Serial, Infrared
Dimensions1.4 inches

Summary

About This Manual

Introduction

Important Service Information

Crucial pre-service details, BIOS/driver updates, and contact info.

FRU Replacement Strategy

Method to minimize costs and ensure correct FRU replacement.

Error Diagnosis and Diskette Compatibility

Using error codes for diagnosis and understanding diskette drive compatibility.

Safety Notices

FRU Handling and General Safety

Precautions for FRU handling, small parts, and general safety.

Battery Safety Warnings

Warnings for Ni-Cd, Nickel, and Lithium batteries: handling, disposal, hazards.

Component-Specific Safety

Safety for LCD fluid contact and inverter card shock hazards.

Electrical Precaution for FRU Removal

Safety notice on powering off and disconnecting cables before FRU removal.

General Safety Precautions

Safe Lifting Practices

Rules for safely lifting heavy objects, including weight limits and technique.

Customer & Equipment Safety

Guidelines to avoid customer hazards and ensure equipment safety.

Personal Safety During Servicing

Precautions against loose clothing, jewelry, and hair hazards.

Electrical Safety

Tool and Equipment Usage

Recommends using approved tools and test equipment for electrical work.

Emergency Power Controls

Importance of knowing emergency power-off switch locations for quick response.

Power Disconnection Procedures

Lists critical tasks requiring power disconnection before proceeding.

Safety Inspection Guide

Exterior Cover Inspection

Guide for inspecting exterior covers for damage like cracks or sharp edges.

ESD Sensitive Device Handling

Precautions for handling ESD-sensitive parts to prevent damage.

Grounding Requirements

ESD Grounding Procedures

Steps for handling ESD-sensitive parts, including packaging and wrist straps.

Laser Compliance Statement

General Descriptions

Read This First

Important notes and guidelines to read before proceeding with service.

FRU Return Information

Information required when returning or exchanging a FRU.

Warranty Exclusions

Details specific types of damage not covered by the warranty.

Related Service Information

Service Web Site

Info on finding maintenance diskettes and system program updates.

Restoring Preloaded System

Steps to restore original software using recovery media.

Product Recovery Program

Detailed steps on using the Product Recovery program to restore software.

Password Management

Explains POP, HDP, SVP passwords and their functions.

Power Management Modes

Overview of the computer's power management modes (screen blank, standby, hibernation).

Checkout Guide

Testing the Computer

Instructions for using PC-Doctor DOS for diagnostics and testing.

Power System Checkout

Procedures for troubleshooting power system issues.

Checking Battery Pack

Steps to check the battery pack's voltage and resistance.

ThinkPad T20, T21, T22 and T23 Series

Product Overview and Specifications

Presents product-unique info, specs, and status indicators.

FRU Tests

Details the applicable tests for each Field Replaceable Unit (FRU).

Fn Key Combinations

Describes the functions of various Fn key combinations for controlling the computer.

Symptom-to-FRU Index

Error Codes and Messages

Lists numeric error codes and messages with FRU actions.

Beep and No-Beep Symptoms

Describes beep codes and no-beep symptoms with FRU actions.

LCD and Intermittent Problems

Details LCD symptoms, intermittent issues, and their FRU solutions.

FRU Replacement Notices

Screw Notices

Guidelines for using special nylon-coated screws and proper tightening.

Restoring Serial Numbers

Procedures for saving and restoring system unit serial numbers and UUIDs.

Removing and Replacing a FRU

Battery Pack and Backup Battery Replacement

Steps for removing and replacing the main and backup batteries.

Hard-Disk Drive and DIMM Replacement

Procedures for replacing the hard-disk drive and DIMM.

Keyboard and Bezel Replacement

Guide for removing and replacing the keyboard and keyboard bezel.

System Board Replacement

Procedure for removing and replacing the system board.

Locations

Front, Rear, and Bottom Views

Identifies and labels components, ports, and views of the computer.

Parts List

Model Matrix and Specifications

Table summarizing model characteristics to identify FRU needs.

Keyboard and Recovery CDs

Lists part numbers for keyboards by language and recovery CDs by OS.

LCD FRUs and Adapters

Lists specific LCD parts, screens, and AC adapters with P/Ns.

Notices

Trademarks

Lists IBM and other company trademarks relevant to the manual.

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