Lenovo ThinkPad T420si Hardware Maintenance Manual - Page 3

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Contents About this manual iii Chapter 1. Safety information 1 General safety 1 Electrical safety 2 Safety inspection guide 3 Handling devices that are sensitive to electrostatic discharge 3 Grounding requirements 4 Safety notices (multilingual translations 4 Laser compliance statement (multilingual translations 24 Chapter 2. Important service information 31 Strategy for replacing FRUs 31 Strategy for replacing a hard disk drive . . . 32 Important notice for replacing a system board 32 How to use error message 32 Strategy for replacing FRUs for CTO, CMV, and GAV 32 Product definition 32 FRU identification for CTO, CMV, and GAV products 33 Chapter 3. General checkout . . . . . 35 What to do first 35 Checkout guide 36 System supporting the Lenovo ThinkVantage Toolbox program and the PC-Doctor for DOS diagnostics program 36 System supporting the Lenovo diagnostics programs 40 Power system checkout 42 Checking the ac power adapter 43 Checking operational charging 44 Checking the battery pack 44 Checking the backup battery 44 Chapter 4. Related service information 47 Restoring the factory contents by using Product Recovery discs 47 Restoring the factory contents by using Recovery Disc Set 47 Passwords 49 Power-on password 49 Hard disk password 49 © Copyright Lenovo 2012 Supervisor password 49 How to remove the power-on password . . . 49 How to remove the hard disk password . . . 50 Power management 50 Screen blank mode 50 Sleep (standby) mode 51 Hibernation mode 51 Symptom-to-FRU index 52 Numeric error codes 53 Error messages 54 Beep symptoms 54 No-beep symptoms 55 LCD-related symptoms 55 Intermittent problems 56 Undetermined problems 56 Chapter 5. Status indicators . . . . . 57 Chapter 6. Fn key combinations . . . 61 Chapter 7. FRU replacement notices 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 and replacing a FRU 67 Before servicing ThinkPad T420s and T420si models 67 1010 Battery pack 68 1020 Serial Ultrabay Slim device or travel bezel . . 69 1030 Solid state drive (SSD) or hard disk drive (HDD 70 1040 DIMM 72 1050 PCI Express Mini Card for wireless LAN . . 74 1060 PCI Express Mini Card for wireless WAN . . 77 1070 4-in-1 media card reader 79 1080 Keyboard 80 1090 Backup battery 83 1100 Palm rest with fingerprint reader, smart card reader, and speaker 84 1110 LCD unit 88 1120 DC-in sub card 90 1130 Bluetooth daughter card (BDC-3.0) . . . . 91 i

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Contents
About this manual
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iii
Chapter 1. Safety information
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1
General safety
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1
Electrical safety
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2
Safety inspection guide
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3
Handling devices that are sensitive to electrostatic
discharge
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3
Grounding requirements
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4
Safety notices (multilingual translations)
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4
Laser compliance statement (multilingual
translations)
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24
Chapter 2. Important service
information
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31
Strategy for replacing FRUs
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31
Strategy for replacing a hard disk drive
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32
Important notice for replacing a system
board
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32
How to use error message
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32
Strategy for replacing FRUs for CTO, CMV, and
GAV
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32
Product definition
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32
FRU identification for CTO, CMV, and GAV
products
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33
Chapter 3. General checkout
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35
What to do first
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35
Checkout guide
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36
System supporting the Lenovo ThinkVantage
Toolbox program and the PC-Doctor for DOS
diagnostics program
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36
System supporting the Lenovo diagnostics
programs
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40
Power system checkout
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42
Checking the ac power adapter
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43
Checking operational charging
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44
Checking the battery pack
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44
Checking the backup battery
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44
Chapter 4. Related service
information
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47
Restoring the factory contents by using Product
Recovery discs
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47
Restoring the factory contents by using Recovery
Disc Set
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47
Passwords
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49
Power-on password
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49
Hard disk password
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49
Supervisor password
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49
How to remove the power-on password .
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49
How to remove the hard disk password .
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50
Power management
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50
Screen blank mode
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50
Sleep (standby) mode
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51
Hibernation mode
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51
Symptom-to-FRU index
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52
Numeric error codes
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53
Error messages
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54
Beep symptoms
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54
No-beep symptoms
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55
LCD-related symptoms
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55
Intermittent problems
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56
Undetermined problems
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56
Chapter 5. Status indicators
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57
Chapter 6. Fn key combinations
...
61
Chapter 7. FRU replacement
notices
................
63
Screw notices
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63
Retaining serial numbers
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64
Restoring the serial number of the system
unit
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64
Retaining the UUID
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65
Reading or writing the ECA information .
.
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65
Chapter 8. Removing and replacing a
FRU
..................
67
Before servicing ThinkPad T420s and T420si
models
.
.
.
.
.
.
.
.
.
.
.
.
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.
.
67
1010 Battery pack
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68
1020 Serial Ultrabay Slim device or travel bezel .
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69
1030 Solid state drive (SSD) or hard disk drive
(HDD)
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70
1040 DIMM
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72
1050 PCI Express Mini Card for wireless LAN
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74
1060 PCI Express Mini Card for wireless WAN .
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77
1070 4–in–1 media card reader
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79
1080 Keyboard
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80
1090 Backup battery
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83
1100 Palm rest with fingerprint reader, smart card
reader, and speaker
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84
1110 LCD unit
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88
1120 DC-in sub card
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90
1130 Bluetooth daughter card (BDC-3.0)
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91
© Copyright Lenovo 2012
i