5. Listen for the fan. If the fan does not run, replace it.
Power Systems Checkout
To verify the symptom of the problem, power on the
computer using each of the power sources as follows:
1. Remove the battery pack, diskette drive, and hard
disk drive.
2. Connect the AC Adapter and check that power is
supplied.
3. Install the diskette drive or hard disk drive one at a
time, and check that power is supplied from each
power source.
4. Disconnect the AC Adapter, remove the hard disk and
diskette drive, and install the charged battery pack;
then check that power is supplied by the battery pack.
If you suspect a power problem, see the appropriate power
supply check in the following list:
“Checking the AC Adapter”
“Checking Operational Charging” on page 423
“Checking the Battery Pack” on page 424
“Checking the Car-Battery Adapter” on page 425
“Checking the Backup Battery (Nonrechargeable)” on
page 426
“Checking the Standby Battery (Rechargeable)” on
page 427
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.
422 IBM Mobile Systems HMM
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