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4. If the controller test runs without errors, the drive
read/write tests start automatically.
5. If the drive test detects an error, FRU code 50 for
FDD-1 or 51 for FDD-2 appears. If the diskette itself
is known to be good, replace the drive.
6. If the drive is attached through a Port Replicator as
FDD-1 or FDD-2 and the test detects errors, move
the drive to the computer's diskette drive connector
directly, and test it again as FDD-1.
If no errors occur at the FDD-1 position, the drive is
not defective. Go to “Port Replicator Checkout” in
“Common Devices Checkout” section to isolate the
replicator problem.
7. If the drive is attached through an Expansion Unit, go
to the service manual of the Expansion Unit to isolate
the problem.
8. If the drive is attached through a Diskette Drive
Attachment Unit, replace the unit.
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 battery pack.
If you suspect a power problem, see the appropriate power
supply check listed below.
“Checking the AC Adapter.”
“Checking Operational Charging” on page 323.
“Checking the Battery Pack” on page 324.
“Checking the Car-Battery Adapter” on page 326.
“Checking the Backup Battery” on page 326.
“Checking the Standby Battery” on page 327.
“Port Replicator Power Overload” on page 330.
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.
322 IBM Mobile Systems HMM