IBM T21, T22 manual Contents

Contents

About this manual . . . .	. . . .	. .	.	iii
Introduction	. . . .	. . .	.	1

Important service information . . . . . . . . . 1 Strategy for replacing FRUs . . . . . . . . 1 How to use error messages . . . . . . . . 2 Diskette compatibility matrix . . . . . . . . . 2 Safety notices: multilingual translations . . . . . . 3 Safety information. . . . . . . . . . . . 13 General safety . . . . . . . . . . . . 13 Electrical safety . . . . . . . . . . . 14 Safety inspection guide . . . . . . . . . 15

Handling devices that are sensitive to electorostatic discharge . . . . . . . . . . . . 16

Grounding requirements . . . . . . . . . 17 Laser compliance statement. . . . . . . . . 18

General descriptions . . . .	. . .	.	.	.	21
Read this first	. . .	.	.	.	21
What to do first	. . .	.	.	.	21
Related service information . . .	. . .	.	.	.	23
Service web site	. . .	.	.	.	23
Restoring the preloaded system	. . .	.	.	.	23
Passwords . . . . . . . . . . . . . 26
Power management . . . .	. . .	.	.	.	28
Checkout guide	. . .	.	.	.	32
Testing the computer . . . .	. . .	.	.	.	33
Detecting system information with PC-Doctor. . . 34
Power system checkout . . .	. . .	.	.	.	35

ThinkPad T20, T21, T22 and T23 series. . . .	. 39
Product overview	.	41
Specifications	.	43
Status indicators	.	45
FRU Tests	.	47
Fn key combinations	.	48
Symptom-to-FRU index	.	49
Numeric error codes	.	49
Error messages	.	52
Beep symptoms	.	53
No-beep symptoms	.	53
LCD-related symptoms	.	54
Intermittent problems	.	55
Undetermined problems	.	55
FRU replacement notices	.	56
Screw notices	.	56
Retaining serial numbers	.	57
Removing and replacing a FRU	.	59
1010 Battery pack	.	60
1020 Backup battery	.	61

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