User Manuals: Lenovo DF21 Desktop Computer

Manuals and User Guides for Lenovo DF21 Desktop Computer. We have 1 Lenovo DF21 Desktop Computer manual available for free PDF download: Hardware Maintenance Manual

Lenovo DF21 Hardware Maintenance Manual

Lenovo DF21 Hardware Maintenance Manual (105 pages)

Brand: Lenovo | Category: Desktop | Size: 49.21 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 Battery and Operational Charging
  35
- Checking the Coin-Cell Battery
  35
Chapter 4. Related Service Information

37
- Reset or Restore Windows
  37
- Passwords
  37
- Power-On Password
  37
- Nvme Password
  37
- Supervisor Password
  38
- System Management Password
  38
- How to Remove the Power-On Password
  38
- 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
- LCD-Related Symptoms
  45
- Intermittent Problems
  46
- Undetermined Problems
  46
Chapter 5. Use the Keyboard Shortcuts

47
Chapter 6. Locations

49
- Computer Controls, Connectors, and Indicators
  49
- Front View
  49
- Side View
  51
- Bottom View
  52
- Locating Frus and Crus
  52
- Major Frus
  54
- Miscellaneous Parts and Other Frus
  56
- Connector and Cable Guide
  56
- Looking up FRU Information
  60
Chapter 7. FRU Replacement Notices

61
- Service Tool Kit
  61
- Screw Notices
  61
- Retaining Serial Numbers
  62
- Restoring the Serial Number of the System Unit
  62
- Retaining the UUID
  63
- Reading or Writing the ECA Information
  64
Chapter 8. Removing or Replacing a FRU

65
Appendix A. Notices

101

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