Filter
Top Products
5. Measure the voltage of the backup battery. See the following gure.
Wire
Voltage (V dc)
Red +2.5 to +3.2
Black
Ground
• If the voltage is correct, replace the system board.
• If the voltage is not correct, replace the backup battery.
• If the backup battery discharges quickly after replacement, replace the system board.
Chapter 3. General checkout 43