Checking the Car-Battery Adapter
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:
Note: The Car-Battery Adapter does not charge the
battery pack when the computer is powered
on. This is not a failure of the Car-Battery.
If the voltage is correct, the Car-Battery Adapter
is working correctly. Check that the computer
runs with the AC Adapter. If it runs correctly
with the AC Adapter, check the system board. If
the problem still remains, replace the following
FRUs one at a time.
a. DC/DC card
b. System board
If the problem is not resolved when the system
board is replaced, go to “Undetermined
Problems” on page 447.
If the voltage is outside the normal voltage
range, do one of the following:
– Try these test procedures in a different car,
if one is available.
– Replace the Car-Battery Adapter if the
computer works correctly with the AC
Adapter.
Note: If the output voltage from the cigarette lighter
socket of the car is less than 10.5 V dc, a
continuous noise may be heard. The condition of
the car battery should be checked by appropriate
service personal.
Pin Voltage (V dc)
1 +19.0 to +21.0
2 Ground
ThinkPad 765D (9546), 765L (9547) 425
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