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IBM-AUSTRIA - PC-HW-Support 30 Aug 1999 |
Checking the AC Adapter (765D-9546 765L-9547)
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 a Port Replicator is used,
replace the replicator.
- 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 Operational Charging'.
- Unplug the AC Adapter cable from the computer and
measure the output voltage at the plug of the AC Adapter cable.
| Pin |
Voltage (Vdc) |
| 1 |
+15.5 to +17.0 |
| 2 |
Ground |
- If the voltage is correct, make sure the connection between DC/DC card
and system board is not loose.
- Replace the DC/DC card
- If the problem is not corrected, replace the system board.
- If the problem is still not corrected, go to 'Undetermined Problems'.
- If the voltage is not correct, go to the next step.
- Unplug the AC Adapter cable from the ac power outlet and wait
five minutes or longer to allow the over-voltage protection circuit
to be fully discharged and initialized.
- Plug the AC Adapter cable into the ac power outlet.
- Measure the output voltage of the AC Adapter.
- If the voltage is still not correct, replace the AC Adapter.
NOTE: An audible noise from the
AC Adapter does not always indicate a defective adapter.
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