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IBM-AUSTRIA - PC-HW-Support 30 Aug 1999 |
Checking the AC Adapter
Checking the AC Adapter.
You are here because the computer fails only when the AC Adapter is used:
- If the power problem occurs only when the ThinkPad Port Replicator with Advanced Etherjet Feature.
- If the power-on indicator does not turn on, check the power cord of the AC Adapter for correct
continuity and installation.
- If the operational charge does not work, go to 'Checking the Operational Charging'.
Unplug the AC Adapter cable from the computer and measure the output voltage at the
plug of the AC Adapter cable. See the following figure.
| Pin |
Voltage (Vdc) |
| 1 |
for 390/i +14.5 to +17.0
for 390E +15.5 to +17.0 |
| 2 |
Ground |
If the voltage is not correct, replace the AC Adapter.
If the voltage is within the range, do the following:
- Replace the DC-DC & BATT board.
- Replace the system/planar board.
- If the problem is not corrected, go to 'Undetermined Problems'.
Note: An audible noise from the AC Adapter does not always indicate a
defective adapter.
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