Lenovo ThinkPad A21e Hardware Maintenance Manual for ThinkPad A22m (wireless m - Page 42

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

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Checkout guide 3. Remove the battery pack (see "1010 Battery pack" on page 58 ). 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 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. 38 ThinkPad A22m wireless models

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3.
Remove the battery pack (see “1010 Battery pack” on
page 58 ).
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 A22m wireless models