4.If the voltage is more than +11.0 V dc, measure the resistance between battery terminals 5 and 7. The resistance must be 4 to 30 K .
If the resistance is not correct, replace the battery pack. If the resistance is correct, replace the system board.
Checking the backup battery
Do the following:
1.Power off the computer, and unplug the AC adapter from it.
2.Turn the computer upside down.
3.Remove the battery pack (see “1010 Battery pack” on page 68).
4.Remove the backup battery (see “1090 Backup battery” on page 86).
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.
General checkout 45
