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Lenovo 21JK User Manual
108 pages
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ThinkPad
E14
Gen
5
/
ThinkPad
E16
Gen
1
Hardware
Maintenance
Manual
2
Table of Contents
default chapter
3
Table of Contents
3
About this Manual
5
Chapter 1. Safety Information
7
General Safety
7
Electrical Safety
7
Safety Inspection Guide
9
Handling Devices that Are Sensitive to Electrostatic Discharge
9
Grounding Requirements
10
Safety Notices (Multilingual Translations)
10
Chapter 2. Important Service Information
25
Strategy for Replacing Frus
25
Strategy for Replacing a Solid-State Drive
25
How to Use Error Message
26
Strategy for Replacing Frus for CTO, Special-Bid, and Standard Models
26
Product Definition
26
FRU Identification
26
Chapter 3. General Checkout
27
What to Do First
27
Checkout Guide
28
Diagnosing Problems
28
Quick Test Programs
29
UEFI Diagnostic Program
29
Bootable Diagnostic Programs
30
Power System Checkout
30
Checking the Ac Power Adapter
31
Checking the Built-In Battery and Operational Charging
31
Checking the Coin-Cell Battery
31
Chapter 4. Related Service Information
33
Reset or Restore Windows
33
Passwords
33
Power-On Password
33
Nvme Passwords
33
Supervisor Password
34
System Management Password
34
How to Remove the Power-On Password
35
How to Remove the Nvme Password
35
How to Remove the System Management Password
35
Power Management
36
Sleep Mode
36
Hibernation Mode
36
Symptom-To-FRU Index
37
Numeric Error Codes
38
Error Messages
39
Beep Errors
39
Beep Symptoms
41
LCD-Related Symptoms
42
Intermittent Problems
43
Undetermined Problems
43
Chapter 5. Special Keys
45
Chapter 6. Locations
47
Locating Computer Controls and Connectors
47
Front View
47
Side View
49
Locating Frus and Crus
52
Major Frus and Crus
53
LCD Frus and Crus
57
Miscellaneous Parts
59
Connector and Cable Guide
59
Looking up FRU Information
62
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 a FRU
67
General Guidelines
67
Before Servicing the Computer
67
Disabling the Built-In Battery
67
1010 Base Cover Assembly
68
1020 Built-In Battery
71
1030 Memory Module and Memory Module Bracket
71
1040 M.2 Solid-State Drive
72
1050 Speaker Assembly
73
1060 Wireless LAN Card
74
1070 Thermal Fan Assembly
75
1080 I/O Board and I/O Board Cable
77
1090 Power Button with or Without Fingerprint Reader and Fingerprint Reader Cable
80
1100 Coin-Cell Battery
81
1110 Trackpad and Trackpad Cable
82
1120 System Board
84
1130 LCD Unit
88
1140 LCD Bezel Assembly
92
1150 LCD Panel and Elastic Adhesive Tapes
93
1160 LCD Hinges
96
1170 Camera and Microphone Rubber(for Selected Models)
97
1180 Edp Cable Assembly
99
1190 Wireless LAN Antenna Assembly (for Selected Models)
99
1200 LCD Cover Assembly
100
Appendix A. Notices
103
Appendix B. Abbreviation Table
105
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Lenovo 21JK Specifications
General
Category
Laptop
Storage
256GB SSD
Display
14-inch FHD (1920x1080)
Operating System
Windows 10 Pro
Model
21JK
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