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Manuals and User Guides for ThinkPad T420. We have
1
ThinkPad T420 manual available for free PDF download: Hardware Maintenance Manual
ThinkPad T420 Hardware Maintenance Manual (186 pages)
Brand:
ThinkPad
| Category:
Laptop
| Size: 22.03 MB
Table of Contents
Table of Contents
3
About this Manual
5
Chapter 1. Safety Information
7
General Safety
7
Electrical Safety
8
Safety Inspection Guide
9
Handling Devices that Are Sensitive to Electrostatic Discharge
9
Grounding Requirements
10
Safety Notices (Multilingual Translations)
11
Laser Compliance Statement (Multilingual Translations)
23
Chapter 2. Important Service Information
29
Strategy for Replacing Frus
29
Strategy for Replacing a Hard Disk Drive
29
Important Notice for Replacing a System Board
30
How to Use Error Message
30
Strategy for Replacing Frus for CTO, CMV, and GAV
31
Product Definition
31
FRU Identification for CTO, CMV, and GAV Products
31
Chapter 3. General Checkout
33
What to Do First
34
Checkout Guide
35
System Supporting the Lenovo Thinkvantage Toolbox Program and the PC-Doctor for DOS Diagnostics Program
35
Lenovo Thinkvantage Toolbox
37
System Supporting the Lenovo Diagnostics Programs
39
Bootable Diagnostic Programs
41
Power System Checkout
43
Checking the Ac Power Adapter
43
Checking Operational Charging
43
Checking the Battery Pack
44
Checking the Backup Battery
44
Chapter 4. Related Service Information
47
Restoring the Factory Contents by Using Recovery Disc Set
47
Copyright Lenovo 2012
47
Passwords
48
Power-On Password
48
Hard-Disk Password
48
Supervisor Password
49
How to Remove the Power-On Password
49
How to Remove the Hard-Disk Password
49
Power Management
51
Screen Blank Mode
51
Sleep (Standby) Mode
51
Hibernation Mode
51
Symptom-To-FRU Index
53
Numeric Error Codes
53
Numeric Error Codes
54
Error Messages
55
Beep Symptoms
56
No-Beep Symptoms
56
LCD-Related Symptoms
56
Intermittent Problems
58
Undetermined Problems
58
Chapter 5. Status Indicators
59
Chapter 6. Fn Key Combinations
63
Chapter 7. FRU Replacement Notices
67
Screw Notices
67
Retaining Serial Numbers
68
Restoring the Serial Number of the System Unit
68
Retaining the UUID
69
Reading or Writing the ECA Information
69
Chapter 8. Removing and Replacing a FRU
71
Before Servicing Thinkpad T420 and T420I
72
1010 Battery Pack
73
1020 Expresscard Blank Bezel
74
1030 Serial Ultrabay Enhanced Device or Travel Bezel
75
1040 Hard Disk Drive (HDD) and Solid State Drive (SSD)
76
1050 DIMM Slot Cover
79
1060 DIMM (in the Slot on the Underside of the Computer)
80
1070 PCI Express Mini Card for Wireless WAN
81
1080 Keyboard
83
1090 DIMM (in the Slot under the Keyboard)
87
1100 Backup Battery
89
1110 PCI Express Mini Card for Wireless LAN
91
1120 Keyboard Bezel Assembly, FPC Cable, and Bluethooth Daughter Card
93
Step Screw (Quantity)
94
1130 Smartcard
98
1140 Modem Daughter Card (MDC)
100
1150 Speaker Assembly
101
1160 LCD Unit
103
1170 Fan Assembly
107
Color Torque Silver 0.181 Nm (1.85 Kgf-CM)
108
1180 Cpu
111
1190 Base Cover Assembly and DC-In Connector Cable
112
1200 Magnesium Structure Frame
116
1210 System Board and Expresscard Slot Assembly
118
1220 Msata Solid State Drive
120
Step Screw (Quantity)
121
M2 × 3 MM, Wafer-Head, Nylon-Coated
121
2010 LCD Bezel Assembly
122
1010 Battery Pack
122
2020 LED Board
123
Color
123
Torque
123
2030 Integrated Camera
125
2040 LCD Panel and LCD Cable
127
2050 Camera Cable
129
2060 Wireless LAN Antenna Assembly or Wireless LAN/WAN Antenna Assembly
130
2070 Hinges and LCD Rear Cover Assembly
132
Chapter 9. Locations
135
Front View
135
Rear View
137
Bottom View
138
Chapter 10. Parts List
139
Overall
140
LCD Frus
161
Keyboard
166
Miscellaneous Parts
168
Information about Ac Power Adapters
170
Power Cords
171
Recovery Discs
172
Common Service Tools
179
Appendix A. Notices
181
Electronic Emissions Notices
182
Trademarks
183
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