IBM PS/2 N51 SX Hardware Maintenance Service page 20

5.2 Checking the Car Battery Adapter
If an output voltage from a cigarette lighter socket is less than 10.5 V
dc, the power-on indicator on the car battery adapter blinks and a noise
can be heard continuously.
1. Unplug the car battery adapter from the computer if connected.
2. Plug the car battery adapter into the cigarette lighter socket.
Note: If the adapter is already plugged in, be sure to unplug the
adapter from the cigarette lighter socket, then plug it into
the socket again.
3. Measure the output voltage of the car battery adapter.
PICTURE 3
+------------------------------------------------------------------------+
¦ Pin
+------------------------------------+-----------------------------------¦
¦ 1
+------------------------------------+-----------------------------------¦
¦ 2
+------------------------------------------------------------------------+
If the voltage is correct and the power-on indicator on the car
battery adapter is on steady, the car battery adapter is working
correctly.
If the voltage is out of range, do one of the following.
Try the above test procedures on another car if available.
Replace the car battery adapter if the system works with the AC
adapter and does not work with the car battery adapter.
IBM PS/2 Model N51 SX HMS
Checking the Car Battery Adapter
The battery of the car is defective.
¦ Voltage (V dc)
¦ +19.0 to +21.0
¦ Ground
¦ Copyright IBM Corp. 1991
5.2 - 1
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