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IBM-AUSTRIA - PC-HW-Support 30 Aug 1999 |
Checking the AC Adapter (TP-770 - 9548/49)
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 AC Adapter is used with a port replicator,
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.
- 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 |
+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 persists, go to 'Undetermined Problems'.
- If the voltage persists, go to the next step.
- Unplug the AC Adapter cable from the ac power outlet and wait 5 minutes or longer to allow
the overvoltage 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 defect.
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