User's Manual

7. If the voltage is less then +9.0 V dc, replace the
DC/DC card. If the voltage is more than +9.0 V dc,
the charging circuit is working correctly, replace the
battery pack.
Checking the Car-Battery Adapter: There are
two 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.
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 227.
 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 Ground
210 IBM Mobile Systems HMM