Lenovo 20R4 Manuals

Manuals and User Guides for Lenovo 20R4. We have 1 Lenovo 20R4 manual available for free PDF download: Hardware Maintenance Manual

Lenovo 20R4 Hardware Maintenance Manual

Lenovo 20R4 Hardware Maintenance Manual (111 pages)

Brand: Lenovo | Category: Laptop | Size: 24.43 MB

Table of Contents

Table of Contents
3
About this Manual
5
Chapter 1. Safety Information

7
Chapter 2. Important Service Information

27
Chapter 3. General Checkout

31
- What to Do First
  31
- Checkout Guide
  32
- Diagnosing Problems
  32
- Quick Test Programs
  32
- UEFI Diagnostic Program
  33
- Bootable Diagnostic Programs
  33
- Power System Checkout
  34
- Checking the Ac Power Adapter
  34
- Checking Operational Charging
  35
- Checking the Built-In Battery
  35
- Checking the Coin-Cell Battery
  36
Chapter 4. Related Service Information

37
- Recovery Overview for the Windows 10 Operating System
  37
- Resetting Your Computer
  37
- Using Advanced Startup Options
  37
- Recovering Your Operating System if Windows 10 Fails to Start
  38
- Creating and Using a Recovery USB Drive
  38
- Passwords
  38
- Power-On Password
  39
- Hard Disk Password
  39
- Supervisor Password
  39
- System Management Password
  39
- How to Remove the Power-On Password
  40
- How to Remove the Hard Disk Password
  40
- How to Remove the System Management Password
  41
- Power Management
  42
- Sleep Mode
  42
- Hibernation Mode
  42
- Symptom-To-FRU Index
  43
- Numeric Error Codes
  43
- Error Messages
  45
- Beep Errors
  45
- Beep Symptoms
  47
- LCD-Related Symptoms
  47
- Intermittent Problems
  48
- Undetermined Problems
  48
Chapter 5. Special Keys

49
Chapter 6. Locations

51
- Locating Computer Controls, Connectors, and Indicators
  51
- Front
  51
- Base
  52
- Left
  53
- Right
  54
- Bottom View
  55
- Locating Frus and Crus
  56
- Major Frus and Crus
  57
- LCD Frus and Crus
  59
- Miscellaneous Parts
  62
- Connector and Cable Guide
  63
- Looking up FRU Information
  64
Chapter 7. FRU Replacement Notices

65
- Service Tool Kit
  65
- Screw Notices
  66
- Retaining Serial Numbers
  66
- Restoring the Serial Number of the System Unit
  67
- Retaining the UUID
  67
Chapter 8. Removing or Replacing a FRU

69
Appendix A. Notices

105
Appendix B. Abbreviation and Acronym Table

107

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