Lenovo 21AH Manuals

Manuals and User Guides for Lenovo 21AH. We have 2 Lenovo 21AH manuals available for free PDF download: Hardware Maintenance Manual, User Manual

Lenovo 21AH Hardware Maintenance Manual

Lenovo 21AH Hardware Maintenance Manual (104 pages)

Brand: Lenovo | Category: Laptop | Size: 46 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

29
- What to Do First
  29
- Checkout Guide
  30
- Diagnosing Problems
  30
- Quick Test Programs
  31
- UEFI Diagnostic Program
  31
- Bootable Diagnostic Programs
  31
- Power System Checkout
  32
- Checking the Ac Power Adapter
  33
- Checking the Built-In Battery and Operational Charging
  33
- Checking the Coin-Cell Battery
  33
Chapter 4. Related Service Information

35
- Reset or Restore Windows
  35
- Passwords
  35
- Power-On Password
  35
- Nvme Passwords
  36
- Supervisor Password
  36
- System Management Password
  36
- How to Remove the Power-On Password
  37
- How to Remove the Nvme Password
  37
- How to Remove the System Management Password
  37
- Power Management
  38
- Sleep Mode
  38
- Hibernation Mode
  39
- Symptom-To-FRU Index
  39
- Numeric Error Codes
  40
- Error Messages
  41
- Beep Errors
  41
- No-Beep Symptoms
  43
- LCD-Related Symptoms
  43
- Intermittent Problems
  44
- Undetermined Problems
  44
Chapter 5. Special Keys

45
Chapter 6. Locations

47
- Locating Computer Controls and Connectors
  47
- Front
  47
- Left and Right
  49
- Rear
  51
- Bottom
  51
- Locating Frus and Crus
  52
- Major Frus and Crus
  53
- LCD Frus and Crus
  56
- Miscellaneous Parts
  58
- Connector and Cable Guide
  58
- Looking up FRU Information
  61
Chapter 7. FRU Replacement Notices

63
- Service Tool Kit
  63
- Screw Notices
  63
- Retaining Serial Numbers
  64
- Restoring the Serial Number of the System Unit
  64
- Retaining the UUID
  65
- Reading or Writing the ECA Information
  65
Chapter 8. Removing or Replacing an FRU

67
Appendix A. Notices

99
Appendix B. Abbreviation Table

101

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Lenovo 21AH User Manual

Lenovo 21AH User Manual (68 pages)

Brand: Lenovo | Category: Laptop | Size: 29 MB

Table of Contents

Table of Contents
3
About this Documentation
5
Chapter 1. Meet Your Computer
7
Front View
7
Side View
11
Bottom View
13
Rear View
15
USB Connectors
16
Chapter 2. Get Started with Your Computer
17
Get Started with Your Desktop
17
Manage Networks
17
Connect to Wi-Fi Networks
17
Airplane Mode
18
Interact with Your Computer
18
Use the Camera
18
Use the Keyboard Shortcuts
18
Use the Trackpoint Pointing Device
19
Use the Trackpad
20
Use the Multi-Touch Screen (for Selected Models)
21
Connect to an External Display
22
Chapter 3. Explore Your Computer
25
Use the Intelligent Cooling Feature
25
Use the P-To-P 2.0 Charging Function
25
Set the Power Plan
25
Connect to a Bluetooth-Enabled Device
26
Enabling Nvidia Proprietary Drivers in Fedora (for Selected Models)
26
Accessories
26
Purchase Options
27
Chapter 4. Secure Your Computer and Information
29
Lock the Computer
29
Use the Fingerprint Reader (for Selected Models)
29
Use Privacy Protection (for Selected Models)
30
Use Passwords
30
Password Types
30
Set, Change, and Remove a Password
31
Use Power Loss Protection Function (for Selected Models)
32
Chapter 5. Configure Advanced Settings
33
Uefi Bios
33
What Is UEFI BIOS
33
Enter the UEFI BIOS Menu
33
Navigate in the UEFI BIOS Interface
33
Change the Startup Sequence
33
Detect Memory Retraining
34
Set the System Date and Time
34
Update UEFI BIOS
34
Chapter 6. CRU Replacement
35
CRU List
35
Disable the Built-In Battery
35
Replace a CRU
36
Base Cover Assembly
36
Keyboard
39
Wireless WAN Card and Wireless-WAN-Card Bracket (for Selected Models)
44
Memory Module (for Intel Models Only)
45
Solid-State Drive and M.2 Solid-State Drive Bracket (for Intel Models Only)
46
Solid-State Drive and M.2 Solid-State Drive Bracket (for AMD Models Only)
48
Chapter 7. Help and Support
51
Frequently Asked Questions
51
Error Messages
52
Beep Errors
53
Self-Help Resources
54
Call Lenovo
55
Before You Contact Lenovo
55
Lenovo Customer Support Center
56
Purchase Additional Services
57
Appendix A. Compliance Information
59
Certification-Related Information
59
Operating Environment
62
Appendix B. Notices and Trademarks
65

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