IBM PS/2 CL57 SX Hardware Maintenance Reference page 22

5.3 Checking the Backup Battery
1. Remove the keyboard and the top cover.
2. Disconnect the battery connector from the system board.
3. Measure the voltage of the backup battery.
PICTURE 5
+------------------------------------------------------------------------+
¦ Wire
+------------------------------------+-----------------------------------¦
¦ Red
+------------------------------------+-----------------------------------¦
¦ Black
+------------------------------------------------------------------------+
If the voltage is correct, replace the system board.
backup battery is discharged by a short circuit or is defective.
IBM PS/2 Model CL57 SX HMS
Checking the Backup Battery
¦ Voltage (V dc)
¦ +2.5 to +3.7
¦ Ground
If it is not, the
¦ Copyright IBM Corp. 1992
5.3 - 1
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