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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 denition. . . . . . . . . . . . 25
FRU identication for CTO, CMV, and GAV
products . . . . . . . . . . . . . . . 25
Chapter 3. General checkout . . . . . 27
What to do rst . . . . . . . . . . . . . . 28
Checkout guide . . . . . . . . . . . . . . 29
Diagnostics using PC-Doctor for DOS. . . . 29
Lenovo ThinkVantage Toolbox . . . . . . . 31
FRU tests . . . . . . . . . . . . . . . 33
Power system checkout . . . . . . . . . . . 34
Checking the ac power adapter . . . . . . 34
Checking operational charging . . . . . . 34
Checking the battery pack . . . . . . . . 35
Checking the backup battery . . . . . . . 35
Chapter 4. Related service
information . . . . . . . . . . . . . . 37
Restoring the factory contents by using Recovery
Disc Set . . . . . . . . . . . . . . . . . 37
Passwords . . . . . . . . . . . . . . . . 38
Power-on password . . . . . . . . . . . 38
Hard-disk password. . . . . . . . . . . 38
Supervisor password . . . . . . . . . . 39
How to remove the power-on password . . . 39
How to remove the hard-disk password . . . 39
Power management . . . . . . . . . . . . 41
Screen blank mode . . . . . . . . . . . 41
Sleep (standby) mode . . . . . . . . . . 41
Hibernation mode . . . . . . . . . . . 41
Symptom-to-FRU index . . . . . . . . . . . 43
Numeric error codes . . . . . . . . . . 43
Error messages . . . . . . . . . . . . 45
Beep symptoms . . . . . . . . . . . . 46
No-beep symptoms . . . . . . . . . . . 46
LCD-related symptoms . . . . . . . . . 46
Intermittent problems . . . . . . . . . . 48
Undetermined problems . . . . . . . . . 48
Chapter 5. Status indicators . . . . . 49
Chapter 6. Fn key combinations . . . 53
Chapter 7. FRU replacement
notices . . . . . . . . . . . . . . . . 57
Screw notices . . . . . . . . . . . . . . . 57
Retaining serial numbers. . . . . . . . . . . 58
Restoring the serial number of the system
unit . . . . . . . . . . . . . . . . . 58
Retaining the UUID . . . . . . . . . . . 59
Reading or writing the ECA information . . . 59
Chapter 8. Removing and replacing a
FRU . . . . . . . . . . . . . . . . . . 61
Before servicing ThinkPad T420 and T420i . . . 62
1010 Battery pack . . . . . . . . . . . . . 63
1020 ExpressCard blank bezel . . . . . . . . 64
1030 Serial Ultrabay Enhanced device or travel
bezel . . . . . . . . . . . . . . . . . . 65
1040 Hard disk drive (HDD) and solid state drive
(SSD) . . . . . . . . . . . . . . . . . . 66
1050 DIMM slot cover. . . . . . . . . . . . 69
1060 DIMM (in the slot on the underside of the
computer) . . . . . . . . . . . . . . . . 70
1070 PCI Express Mini Card for wireless WAN . . 71
1080 Keyboard . . . . . . . . . . . . . . 73
1090 DIMM (in the slot under the keyboard) . . . 77
1100 Backup battery . . . . . . . . . . . . 79
1110 PCI Express Mini Card for wireless LAN . . 81
1120 Keyboard bezel assembly, FPC cable, and
Bluethooth daughter card . . . . . . . . . . 83
1130 SmartCard . . . . . . . . . . . . . . 88
1140 Modem daughter card (MDC). . . . . . . 90
1150 Speaker assembly . . . . . . . . . . . 91
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