space key. A √ mark appears next to the
selected icon. Insert the blank diskette when
instructed.
2. Run the diskette drive test.
3. If the controller test detects an error, FRU code 10
appears. Replace the system board.
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
appears. If the diskette itself is known to be good,
replace the drive.
If no errors occur at the FDD position, the drive is not
defective.
Power Systems Checkout
To verify the symptom of the problem, power-on the
computer using each of the power sources available as
follows.
1. Remove the battery pack.
2. Connect the AC Adapter and check that power is
supplied.
3. Disconnect the AC Adapter 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 the Battery Pack” on page 30.
“Checking the Backup Battery” on page 31.
“Checking the Standby Battery” on page 32.
Checking the AC Adapter: You are here
because the computer fails only when the AC Adapter is
used. If the power-on indicator does not turn on, check
the power cord of the AC Adapter for correct continuity and
installation.
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.
ThinkPad 340x (IBM 2610)
29
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