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If either the pointing stick or the click button does not work,
do the following actions one at a time to correct the
problem. Do not replace a nondefective FRU.
Reseat the keyboard card cables.
Replace the keyboard card cables.
Replace the keyboard card assembly.
Replace the video card.
Replace the system board.
Fan Checkout (Models 760XL/760XD)
The cooling fan is controlled by a thermostat on the video
card. Prior to checking the fan, confirm that the 760XL or
760XD passes the diagnostics. Refer to “How to Run the
Diagnostics” on page 373.
Model 760XL: To check the fan, do the following:
1. Turn off the computer.
2. Remove the following FRUs (see “FRU Removals and
Replacements” on page 382):
a. Diskette drive/CD-ROM drive
b. Battery pack
c. Hard disk drive
d. Top cover
e. LCD unit
f. Keyboard unit
g. Rear IR
h. System board assembly
i. Upper shield
3. Attach the AC adapter to the system board assembly.
4. Find U9 on the video card. Apply a short across pin
1 and pin 4 of U9 (LM56) with an appropriate
conductor. Then, turn on the computer.
Attention
Make sure the location of pin 1 and pin 4. Pin 8
is for power control. Don't touch pin 8.
Applying a short across pin 8 and another pin
may damage the card.
5. Check the rotation of the fan.
ThinkPad 760 (9546, 9547)
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