Lenovo T420i manual Contents

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
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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