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Lenovo T420 User Manual

Lenovo T420
188 pages
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Table of Contents

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Lenovo T420 Specifications

General IconGeneral
ProcessorIntel Core i5 or i7 (2nd Gen)
RAMUp to 16GB DDR3
GraphicsIntel HD Graphics 3000 or NVIDIA NVS 4200M
Display14-inch, 1366x768 or 1600x900
Operating SystemWindows 7 Professional
Battery LifeUp to 9 hours
Battery6-cell Li-ion
PortsUSB 2.0, USB 3.0, VGA, DisplayPort, Ethernet
WirelessWi-Fi 802.11 a/b/g/n
StorageHDD or SSD
Weight2.2 kg (4.85 lbs)

Summary

About This Manual

Chapter 1. Safety Information

General Safety

Essential guidelines for safe handling and maintenance procedures.

Electrical Safety

Rules and precautions for working with electrical components.

Safety Inspection Guide

Checklist for identifying and mitigating potential safety hazards.

Handling ESD-Sensitive Devices

Procedures for protecting sensitive electronic components from static discharge.

Grounding Requirements

Guidelines for proper electrical grounding for safety and system function.

Safety Notices (Multilingual)

Important safety warnings and precautions in multiple languages.

Laser Compliance Statement

Information and warnings regarding laser safety compliance.

Chapter 2. Important Service Information

FRU Replacement Strategy

Guidelines for effective and economical replacement of Field Replaceable Units (FRUs).

Replacing a Hard Disk Drive

Procedures and considerations for replacing the HDD or SSD.

System Board Replacement Notice

Important precautions and handling guidelines for system board replacement.

Using Error Messages for Diagnosis

How to interpret and use error codes for troubleshooting.

FRU Identification for CTO/CMV/GAV

Methods for identifying FRUs for custom and standard product configurations.

Chapter 3. General Checkout

Initial Troubleshooting Steps

Steps to take before performing detailed diagnostics or checks.

Checkout Guide

A systematic approach to identifying and correcting ThinkPad issues.

PC-Doctor for DOS Diagnostics

How to use the PC-Doctor diagnostic tool for system testing.

Lenovo ThinkVantage Toolbox

Utilizing ThinkVantage Toolbox for system diagnostics and problem resolution.

FRU Tests

Specific diagnostic tests for individual Field Replaceable Units (FRUs).

Power System Checkout

Procedures for diagnosing and verifying power supply issues.

Chapter 4. Related Service Information

Factory Content Restoration

Steps for restoring the computer to its original factory configuration using recovery discs.

System Passwords Management

Information on Power-on, Hard-disk, and Supervisor passwords.

Power Management Modes

Explanation of screen blank, sleep, and hibernation power saving modes.

Symptom-to-FRU Index

A guide linking symptoms and errors to specific FRUs for troubleshooting.

Chapter 5. Status Indicators

Speaker and Microphone Mute Indicators

Status of speaker and microphone mute functions.

Wireless and Bluetooth Status

Indicates the status of wireless LAN, WAN, and Bluetooth features.

Device Access and Power Indicators

Shows activity on storage devices and system power status.

Serial Ultrabay and Caps Lock Indicators

Status of the Serial Ultrabay device and Caps Lock key.

Battery Status Indicators

Displays battery charge level, charging status, and errors.

Sleep/Standby Indicator

Indicates when the computer is in sleep or standby mode.

Chapter 6. Fn Key Combinations

System Lock and Power Plan Control

Fn key combinations for locking the system and managing power plans.

Sleep, Hibernation, and Wireless Control

Fn key combinations for sleep, hibernation, and wireless feature control.

Camera, Display, and Pointing Device Control

Fn keys for camera settings, display output, and UltraNav device.

Media Player and Other Function Keys

Fn key combinations for media playback and other system functions.

Chapter 7. FRU Replacement Notices

Screw Tightening Procedures

Guidelines for correctly tightening screws during FRU replacement.

Serial Number Management

Procedures for restoring system unit serial numbers after board replacement.

ECA Information Handling

How to read and write Engineering Change Announcement (ECA) information.

Chapter 8. Removing and Replacing a FRU

General FRU Servicing Rules

Key rules to follow before, during, and after FRU replacement.

SIM Card Removal

Steps to remove the SIM card before servicing the computer.

Battery Pack Replacement

Detailed instructions for removing and installing the battery pack.

ExpressCard Bezel Replacement

Procedure for removing and installing the ExpressCard blank bezel.

Ultrabay Device/Bezel Replacement

Steps to remove and replace the Serial Ultrabay Enhanced device or travel bezel.

HDD/SSD Replacement

Instructions for removing and installing the hard disk or solid state drive.

DIMM Slot Cover Removal

Procedure for removing the DIMM slot cover.

DIMM Replacement (Underside)

Steps for removing and installing DIMM modules from the underside.

Wireless WAN Card Replacement

Instructions for replacing the PCI Express Mini Card for wireless WAN.

Keyboard Replacement

Detailed steps for removing and installing the keyboard.

DIMM Replacement (Under Keyboard)

Steps for removing and installing DIMM modules from under the keyboard.

Backup Battery Replacement

Procedure for removing and installing the backup battery.

Wireless LAN Card Replacement

Instructions for replacing the PCI Express Mini Card for wireless LAN.

Keyboard Bezel/FPC/Bluetooth Card Replacement

Steps to replace the keyboard bezel, FPC cable, and Bluetooth daughter card.

SmartCard Reader Replacement

Procedure for removing and installing SmartCard readers.

Modem Daughter Card (MDC) Replacement

Instructions for replacing the Modem daughter card.

Speaker Assembly Replacement

Steps to remove and install the speaker assembly.

LCD Unit Replacement

Detailed procedure for removing and replacing the LCD unit.

Fan Assembly Replacement

Instructions for removing and installing the CPU fan assembly.

CPU Replacement

Critical steps for handling and replacing the CPU.

Base Cover/DC-in Cable Replacement

Procedure for removing and replacing the base cover and DC-in cable.

Magnesium Structure Frame Replacement

Steps for removing and replacing the internal magnesium structure frame.

System Board Replacement

Critical procedures and precautions for system board replacement.

LCD Bezel Assembly Replacement

Instructions for removing and installing the LCD bezel assembly.

LED Board Replacement

Procedure for removing and installing the LED board.

Integrated Camera Replacement

Steps for removing and installing the integrated camera module.

LCD Panel and Cable Replacement

Detailed instructions for replacing the LCD panel and its cable.

Camera Cable Replacement

Procedure for removing and installing the camera cable.

Wireless Antenna Assembly Replacement

Steps for removing and installing wireless LAN/WAN antenna assemblies.

Hinges and LCD Rear Cover Replacement

Procedure for removing and replacing hinges and the LCD rear cover.

Chapter 9. Locations

Rear View Port Locations

Shows the location of ports and connectors on the rear of the ThinkPad.

Bottom View Component Locations

Identifies hardware components on the bottom of the ThinkPad.

Front View Component Locations

Identifies hardware components visible on the front of the ThinkPad.

Chapter 10. Parts List

Overall Parts List

Comprehensive listing of all FRUs with part numbers and CRU IDs.

LCD Parts List

Specific part numbers for different LCD panel types.

Keyboard Parts List

List of available keyboard FRUs by language layout.

Miscellaneous Parts List

Includes screws, seals, and other small components.

AC Power Adapter Information

Details on compatible AC power adapters.

Power Cords List

Lists power cords available for different countries and regions.

Recovery Discs Information

Details on operating system and driver recovery DVDs.

Common Service Tools

List of tools required for servicing the ThinkPad.

Appendix A. Notices

Trademarks

Related product manuals