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