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Model 760XD: The fan starts when the temperature
of the inside box rises over 54°C, and stops when the
temperature of the inside box falls under 49°C.
To check the fan, do the following:
1. Turn off the computer.
2. Do the following steps to warm the computer up so
that the fan starts:
a. Put the computer on a non-thermal-conductive
material — for example, corrugated cardboard.
b. Attach the AC adapter; then turn on the
computer.
c. Run the video function loop test of the
diagnostics (see “How to Run the Diagnostics”
on page 373)
d. Close the LCD unit.
The fan should start rotating within 30 minutes.
3. Check the air flow coming out from the fan louver.
Game Port Checkout
Do the following if a joystick problem occurs:
1. Connect the joystick to the game port.
2. Go to the Easy-Setup menu.
3. Select an item with the joystick.
4. Press any button of the joystick.
5. Verify that all buttons work correctly.
If either the joystick or a button does not work, replace the
video card. If the problem persists, replace the system
board.
Diskette Drive Test
Do the following to isolate the problem to a controller,
drive, or diskette. A scratch, write enabled, nondefective
2HD diskette is required.
FDD-1 represents the the diskette drive in the UltraBay.
FDD-2 represents the port replicator, expansion unit, or
diskette drive attached through the external diskette drive
connector.
Warning: Make sure that the diskette does not have
more than one label attached to it. Multiple labels can
cause damage to the drive or can cause the drive to fail.
Do the following to select the test device:
1. Select the advanced diagnostics mode and select
Tool; then select FDD-1 or FDD-2 and press the
Spacebar.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.
348 IBM Mobile Systems - ThinkPad HMM Volume 3