IBM MT 2675 manual Checking the backup battery, Checking the sub-battery

Checkout guide

Checking the backup battery

Do the following:

1.Power off the computer, and unplug the ac adapter from it.

2.Remove the battery pack (for the removal procedure, see “1010 Battery pack” on page 56).

3.Remove the backup battery (for the removal procedure, see “1060 Backup battery and sub-battery” on

page 73).

4.Measure the voltage of the backup battery. See the following figure.

Wire	Voltage (V dc)
Red	+2.5 to +3.2
Black	Ground

vIf the voltage is correct, replace the system board.

vIf the voltage is not correct, replace the backup battery.

vIf the backup battery discharges quickly after replacement, replace the system board.

Checking the sub-battery

Do the following:

1.Recharge the sub-battery; it might have been discharged.

2.Power off the computer, and unplug the ac adapter from it.

3.Remove the battery pack (for the removal procedure, see “1010 Battery pack” on page 56).

4.Remove the sub-battery (for the removal procedure, see “1060 Backup battery and sub-battery” on page 73).

5.Measure the voltage of the sub-battery. See the following figure.

Wire	Voltage (V dc)
Red	+6.0 to +9.0
Black	Ground

vIf the voltage is correct, replace the system board.

vIf the voltage is not correct, replace the sub-battery .

vIf the sub-battery discharges quickly after replacement, replace the system board.

General descriptions 31