IBM THINKPAD A20M User Manual download pdf (Page 44)

3. Remove the battery pack (see “1010 Battery pack” on

page 60 ).

4. Remove the backup battery (see “Checking the battery

pack” on page 37).

5. Measure the voltage of the backup battery. See the

following figure.

Red (+)

Black (-)

Wire Voltage (V dc)

Red +2.5 to +3.2

Black Ground

v If the voltage is correct, replace the system board.

v If the voltage is not correct, replace the backup battery.

v If the backup battery discharges quickly after

replacement, replace the system board.

Checkout guide

38 ThinkPad A20m/p, A21m/p, A22m/p

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 157 158

IBM Mobile Systems 1
ThinkPad Computer 1
Hardware Maintenance Manual 1
About this manual 3
Contents 5
Introduction 7
How to use error messages 8
Diskette compatibility matrix 8
Safety notices 10
Safety information 20
General safety 20
Electrical safety 21
Safety inspection guide 22
Handling electrostatic 23
Grounding requirements 24
Laser compliance statement 24
General descriptions 29
Read this first 30
Related service information 31
Service web site 31
Product recovery program 31
Passwords 33
Power-on password: 34
Hard-disk password: 34
Supervisor password: 34
Power management 36
Hibernation mode 37
Checkout guide 39
Testing the computer 39
PC-Doctor 41
Power system checkout 41
Checking the ac adapter 42
Checking operational charging 42
Checking the battery pack 43
Checking the backup battery 43
Black (-) 44
ThinkPad A20m/p, A21m/p and 45
Product overview 47
Specifications 47
Status indicators 50
FRU tests 52
Fn key combinations 54
Symptom-to-FRU index 55
Numeric error codes 55
Error messages 58
Beep symptoms 59
No beep symptoms 59
LCD-related symptoms 60
Intermittent problems 61
Undetermined problems 61
90 degrees more 62
(Cross-section) 62
180 degrees more 62
Retaining serial numbers 63
FRU replacement notices 64
1010 Battery pack 66
1020 DIMM 67
1030 Mini PCI adapter 69
For A20m/p, A21m/p series 70
For A22m/p series 71
1040 Backup battery 72
Step Screw (quantity) 73
1060 Ultrabay 2000 device 75
1070 Keyboard 77
1080 Keyboard CRU insulator 80
Step Screw (quantity) Torque 81
(4 kgfcm) 81
1120 Sub card 86
1130 PC Card slot assembly 88
1140 Fan assembly 89
1150 Diskette drive 91
1160 Upper shield 93
1170 TV card 94
1180 CPU socket and CPU 95
1190 System board and RJ45/11 97
For A20m/p and A21m/p series 98
Thermal rubbers location 99
2010 LCD assembly 100
2020 Front bezel 102
14.1-in. and 15.0-in. panels 103
(LG)” on page 138 104
2030 Inverter card 105
2040 LCD panel 107
(continued) 108
Removing and replacing a FRU 110
3010 ThinkPad Dock PCI cover 111
3020 ThinkPad Dock top cover 113
(Bottom view) 114
Locations 118
Front view 118
Rear view 119
Bottom view 120
Parts list 121
A series model matrix 121
*1: Memory 128 MB 122
AC adapter 142
LCD FRUs 142
14.1-in. XGA TFT 143
15.0-in. XGA TFT (LG) 144
15.0-in. XGA TFT (SAMSUNG) 144
15.0-in. SXGA+ TFT 145
15.0-in. UXGA TFT 145
Keyboard 146
Recovery CDs 147
For Windows 98 (A22p) 148
For Windows 2000 (A22m) 149
For Windows 2000 (A22p) 149
Miscellaneous parts 151
Optional FRUs 153
Common parts list 154
Power cords (docking station) 155
Trademarks 156
Part Number: 23P0896 158
(1P) P/N: 23P0896 158

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IBM THINKPAD A20M User Manual Page 44

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