Lenovo ThinkPad A21e TP A21e, A22e Hardware Maintenance Manual (June 2001) - Page 40

Checking the backup battery, Black

Get Lenovo ThinkPad A21e PDF manuals and user guides View all Lenovo ThinkPad A21e manuals
Add to My Manuals
Save this manual to your list of manuals

Page 40 highlights

Checkout guide Note: Recharging will take at least 3 hours, even if the indicator does not turn on. If the voltage is still less than +11.0 V dc after recharging, replace the battery. for Nickel metal hydride battery; v If the voltage is less than +8.0 V dc, the battery pack has been discharged. Note: Recharging will take at least 3 hours, even if the indicator does not turn on. If the voltage is still less than +8.0 V dc after recharging, replace the battery. 4. for Lithium ion battery; v If the voltage is more than +11.0 V dc, measure the resistance between battery terminals 4 and 5. The resistance must be 4 to 30 K ohm. for Nickel metal hydride battery; v If the voltage is more than +8.0 V dc, measure the resistance between battery terminals 4 and 5. The resistance must be 4 to 30 K ohm. If the resistance is not correct, replace the battery pack. If the resistance is correct, replace the system board. Checking the backup battery Do the following: 1. Power off the computer, and unplug the ac adapter from it. 2. Turn the computer upside down. 3. Remove the battery pack (see "1010 Battery pack" on page 57). 4. Remove the backup battery (see "Checking the battery pack" on page 35). 5. Measure the voltage of the backup battery. See the following figure. Red (+) Black (-) Wire Red Black Voltage (V dc) +2.5 to +3.2 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. 36 ThinkPad A21e, A22e, i 1800 (MT 2655/2663/2664)

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
Note:
Recharging will take at least 3 hours, even if
the indicator does not turn on.
If the voltage is still less than +11.0 V dc after
recharging, replace the battery.
for Nickel metal hydride battery;
v
If the voltage is less than +8.0 V dc, the battery
pack has been discharged.
Note:
Recharging will take at least 3 hours, even if
the indicator does not turn on.
If the voltage is still less than +8.0 V dc after
recharging, replace the battery.
4.
for Lithium ion battery;
v
If the voltage is more than +11.0 V dc, measure the
resistance between battery terminals 4 and 5. The
resistance must be 4 to 30 K ohm.
for Nickel metal hydride battery;
v
If the voltage is more than +8.0 V dc, measure the
resistance between battery terminals 4 and 5. The
resistance must be 4 to 30 K ohm.
If the resistance is not correct, replace the battery
pack. If the resistance is correct, replace the system
board.
Checking the backup battery
Do the following:
1.
Power off the computer, and unplug the ac adapter
from it.
2.
Turn the computer upside down.
3.
Remove the battery pack (see “1010 Battery pack” on
page 57).
4.
Remove the backup battery (see “Checking the battery
pack” on page 35).
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
36
ThinkPad A21e, A22e, i 1800 (MT 2655/2663/2664)