Lenovo ThinkPad T420 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 5 Laser compliance statement (multilingual translations 17 Chapter 2. Important service information 23 Strategy for replacing FRUs 23 Strategy for replacing a hard disk drive . . . 23 Important notice for replacing a system board 24 How to use error message 24 Strategy for replacing FRUs for CTO, CMV, and GAV 25 Product definition 25 FRU identification for CTO, CMV, and GAV products 25 Chapter 3. General checkout . . . . . 27 What to do first 28 Checkout guide 29 System supporting the Lenovo ThinkVantage Toolbox program and the PC-Doctor for DOS diagnostics program 29 System supporting the Lenovo diagnostics programs 33 Power system checkout 37 Checking the ac power adapter 37 Checking operational charging 37 Checking the battery pack 38 Checking the backup battery 38 Chapter 4. Related service information 41 Restoring the factory contents by using Recovery Disc Set 41 Passwords 42 Power-on password 42 Hard-disk password 42 Supervisor password 43 How to remove the power-on password . . . 43 How to remove the hard-disk password . . . 43 Power management 45 Screen blank mode 45 Sleep (standby) mode 45 Hibernation mode 45 Symptom-to-FRU index 47 Numeric error codes 47 Error messages 49 Beep symptoms 50 No-beep symptoms 50 LCD-related symptoms 50 Intermittent problems 52 Undetermined problems 52 Chapter 5. Status indicators . . . . . 53 Chapter 6. Fn key combinations . . . 57 Chapter 7. FRU replacement notices 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 . . . 63 Chapter 8. Removing and replacing a FRU 65 Before servicing ThinkPad T420 and T420i . . . 66 1010 Battery pack 67 1020 ExpressCard blank bezel 68 1030 Serial Ultrabay Enhanced device or travel bezel 69 1040 Hard disk drive (HDD) and solid state drive (SSD 70 1050 DIMM slot cover 73 1060 DIMM (in the slot on the underside of the computer 74 1070 PCI Express Mini Card for wireless WAN . . 75 1080 Keyboard 77 1090 DIMM (in the slot under the keyboard) . . . 81 1100 Backup battery 83 1110 PCI Express Mini Card for wireless LAN . . 85 1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card 87 1130 SmartCard 92 1140 Modem daughter card (MDC 94 © Copyright Lenovo 2012 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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Electrical safety
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Safety inspection guide
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3
Handling devices that are sensitive to electrostatic
discharge
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Grounding requirements
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4
Safety notices (multilingual translations)
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5
Laser compliance statement (multilingual
translations)
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17
Chapter 2. Important service
information
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23
Strategy for replacing FRUs
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23
Strategy for replacing a hard disk drive
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Important notice for replacing a system
board
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24
How to use error message
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24
Strategy for replacing FRUs for CTO, CMV, and
GAV
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25
Product definition
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25
FRU identification for CTO, CMV, and GAV
products
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25
Chapter 3. General checkout
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27
What to do first
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28
Checkout guide
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29
System supporting the Lenovo ThinkVantage
Toolbox program and the PC-Doctor for DOS
diagnostics program
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29
System supporting the Lenovo diagnostics
programs
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33
Power system checkout
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37
Checking the ac power adapter
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37
Checking operational charging
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37
Checking the battery pack
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38
Checking the backup battery
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38
Chapter 4. Related service
information
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41
Restoring the factory contents by using Recovery
Disc Set
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41
Passwords
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42
Power-on password
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42
Hard-disk password
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42
Supervisor password
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43
How to remove the power-on password .
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43
How to remove the hard-disk password .
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43
Power management
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45
Screen blank mode
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Sleep (standby) mode
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45
Hibernation mode
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45
Symptom-to-FRU index
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47
Numeric error codes
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Error messages
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49
Beep symptoms
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50
No-beep symptoms
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50
LCD-related symptoms
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50
Intermittent problems
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52
Undetermined problems
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52
Chapter 5. Status indicators
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53
Chapter 6. Fn key combinations
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57
Chapter 7. FRU replacement
notices
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61
Screw notices
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61
Retaining serial numbers
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62
Restoring the serial number of the system
unit
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62
Retaining the UUID
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63
Reading or writing the ECA information .
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63
Chapter 8. Removing and replacing a
FRU
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65
Before servicing ThinkPad T420 and T420i
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66
1010 Battery pack
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67
1020 ExpressCard blank bezel
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68
1030 Serial Ultrabay Enhanced device or travel
bezel
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69
1040 Hard disk drive (HDD) and solid state drive
(SSD)
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1050 DIMM slot cover
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73
1060 DIMM (in the slot on the underside of the
computer)
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74
1070 PCI Express Mini Card for wireless WAN .
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1080 Keyboard
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77
1090 DIMM (in the slot under the keyboard)
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81
1100 Backup battery
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83
1110 PCI Express Mini Card for wireless LAN
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85
1120 Keyboard bezel assembly, FPC cable, and
Bluethooth
daughter card
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87
1130 SmartCard
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92
1140 Modem daughter card (MDC)
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94
© Copyright Lenovo 2012
i