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 |
|
|
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.
