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6. Remove the memory card and PCMCIA cards and
check the power supply. Reinstall one at a time and
check the power supply.
7. Disconnect the AC Adapter. Remove the CD-ROM
and Audio Card. Reinstall one at a time, connect the
AC Adapter and check that power is supplied.
If you suspect a power problem, see the appropriate power
supply check listed below.
“Checking the AC Adapter.”
“Checking Operational Charging” on page 37.
“Checking the Battery Pack” on page 37.
“Port Replicator Power Overload” on page 40.
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 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” on page 37.
Use the following procedure to check the adapter.
1. 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.
If the voltage is correct:
– Replace the DC/DC Card.
– If the problem remains, replace the system
board.
If the problem still is not corrected, go to
“Undetermined Problems” on page 49.
If the voltage is not correct, go to the next step.
2. 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.
3. Plug the AC Adapter cable into the ac power outlet.
Pin Voltage (V dc)
1 +10.0 to +16.0
2 Ground
36 IBM Mobile Systems - ThinkPad HMM Volume 3