space key.√ A mark appears next to the selected icon. Insertblank thediskette when instructed.

2.Run the diskette drive test.

3.If the controller test detects an error, FRU code 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 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 po supply check listed below.

Ÿ

“Checking

the

AC Adapter.”

Ÿ

“Checking the Battery Pack” on page 30.

Ÿ

“Checking

the

Backup Battery” on page 31.

Ÿ“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 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