User Manuals: Lenovo 4178A56 ThinkPad T420

Manuals and User Guides for Lenovo 4178A56 ThinkPad T420. We have 2 Lenovo 4178A56 ThinkPad T420 manuals available for free PDF download: Hardware Maintenance Manual, Brochure

Lenovo 4178A56 Hardware Maintenance Manual

Lenovo 4178A56 Hardware Maintenance Manual (188 pages)

Lenovo ThinkPad T420 2620: User Guide

Brand: Lenovo | Category: Laptop | Size: 20.76 MB

Table of Contents

Table of Contents
3
About this Manual

5
Chapter 1. Safety Information

7
Chapter 2. Important Service Information

29
- Strategy for Replacing Frus
  29
- Strategy for Replacing Frus for CTO, CMV, and GAV
  31
  - Product Definition
    31
  - FRU Identification for CTO, CMV, and GAV Products
    31
Chapter 3. General Checkout

33
- What to Do First
  34
- Checkout Guide
  35
  - Diagnostics Using PC-Doctor for DOS
    35
  - Lenovo Thinkvantage Toolbox
    37
  - FRU Tests
    39
- Power System Checkout
  41
Chapter 4. Related Service Information

45
- Restoring the Factory Contents by Using Recovery Disc Set
  45
  - Copyright Lenovo 2011
    45
- Passwords
  46
  - Power-On Password
    46
  - Hard-Disk Password
    46
  - Supervisor Password
    47
  - How to Remove the Power-On Password
    47
  - How to Remove the Hard-Disk Password
    47
- Power Management
  49
  - Screen Blank Mode
    49
  - Sleep (Standby) Mode
    49
  - Hibernation Mode
    50
- Symptom-To-FRU Index
  51
  - Numeric Error Codes
    51
  - Numeric Error Codes
    52
  - Error Messages
    53
  - Beep Symptoms
    54
  - No-Beep Symptoms
    54
  - LCD-Related Symptoms
    55
  - Intermittent Problems
    56
  - Undetermined Problems
    56
Chapter 5. Status Indicators

57
Chapter 6. Fn Key Combinations

61
Chapter 7. FRU Replacement Notices

65
- Screw Notices
  65
- Retaining Serial Numbers
  66
Chapter 8. Removing and Replacing a FRU

69
Chapter 9. Locations

135
- Front View
  135
- Rear View
  137
- Bottom View
  138
Chapter 10. Parts List

139
- Overall
  140
- LCD Frus
  160
- Keyboard
  172
- Miscellaneous Parts
  173
- Information about Ac Power Adapters
  176
- Power Cords
  177
- Recovery Discs
  178
- Common Service Tools
  184
Appendix A. Notices

185
- Trademarks
  186

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Lenovo 4178A56 Brochure

Lenovo 4178A56 Brochure (4 pages)

Brochure

Brand: Lenovo | Category: Laptop | Size: 2.33 MB

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