the charging circuit is working correctly, replace the
battery pack.
Checking the Car-Battery Adapter
Note: There are several types of adapters but the
checkout procedure is the same for both of them.
1. Unplug the Car-Battery Adapter cable from the
computer.
2. Plug the Car-Battery Adapter into the cigarette lighter
socket.
Note: If the adapter is already plugged in, reseat it.
3. Measure the output voltage of the Car-Battery
Adapter cable. See the following figure.
3
1
2
If the voltage is correct and the power-on
indicator on the Car-Battery Adapter is on all the
time, the Car-Battery is working correctly.
Replace the system board.
If the problem is not resolved when the system
board is replaced, go to “Undetermined
Problems” on page 419.
If the voltage is outside the normal voltage
range, do one of the following:
– Try the above test procedures in a different
car, if one is available.
– Replace the Car-Battery Adapter if the
computer works correctly with the AC
Adapter.
Notes:
1. If the output voltage from the cigarette lighter socket
of the car is less than 10.5 V dc, the power-on
indicator on the Car-Battery Adapter blinks and a
continuous noise can be heard. The condition of the
car battery should be checked by appropriate service
personal.
2. The Car-Battery Adapter does not support operational
charging.
Pin Voltage (V dc)
1 +19.0 to +21.0
2, 3 Ground
402 IBM Mobile Systems HMM
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