Lenovo 21D4 Manuals

Manuals and User Guides for Lenovo 21D4. We have 1 Lenovo 21D4 manual available for free PDF download: Hardware Maintenance Manual

Lenovo 21D4 Hardware Maintenance Manual

Lenovo 21D4 Hardware Maintenance Manual (104 pages)

Brand: Lenovo | Category: Laptop | Size: 31.95 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
  33
- UEFI Diagnostic Program
  33
- Bootable Diagnostic Programs
  33
- Power System Checkout
  34
- Checking the Ac Power Adapter
  34
- Checking the Built-In Battery and Operational Charging
  35
Chapter 4. Related Service Information

37
- Reset or Restore Windows
  37
- Passwords
  37
- Power-On Password
  37
- Nvme Passwords
  38
- Supervisor Password
  38
- System Management Password
  38
- How to Remove the Power-On Password
  39
- How to Remove the Nvme Password
  39
- How to Remove the System Management Password
  39
- Power Management
  40
- Sleep Mode
  40
- Hibernation Mode
  41
- Symptom-To-FRU Index
  41
- Numeric Error Codes
  42
- Error Messages
  43
- Beep Errors
  43
- Beep Symptoms
  45
- LCD-Related Symptoms
  45
- Intermittent Problems
  46
- Undetermined Problems
  46
Chapter 5. Special Keys

49
Chapter 6. Locations

51
- Locating Computer Controls and Connectors
  51
- Front View
  51
- Side View
  53
- Bottom View
  55
- Locating Frus and Crus
  56
- Major Frus and Crus (for Thinkpad Z13 Gen 1)
  57
- Major Frus and Crus (for Thinkpad Z16 Gen 1)
  59
- Miscellaneous Parts
  61
- Connector and Cable Guide
  61
- Looking up FRU Information
  64
Chapter 7. FRU Replacement Notices

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

69
Appendix A. Notices

99
Appendix B. Abbreviation Table

101

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