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Screw Tightening Information
Loose screws can cause a reliability problem. The IBM
ThinkPad computer addresses this problem with
nylon-coated screws. Tighten screws as follows:
Plastic to plastic
Turn an additional 90 degrees after the screw head
touches the surface of the plastic part:
Logic card to plastic
Turn an additional 180 degrees after the screw head
touches the surface of the logic card:
Torque driver
If you have a torque driver, refer to the “Torque”
instruction with each step.
How to Use Error Messages: Use the error
codes displayed on the screen to diagnose failures. If
more than one error code is displayed, begin the diagnosis
with the first error code. Whatever caused the first error
code can result in false error codes being displayed. If no
error code is displayed, see if the error symptom is listed
in the “Symptom-to-FRU Index” on page 23.
Port Replicator Problems: If you suspect a
problem with the port replicator, see “Port Replicator
Checkout” on page 18.
How to Diagnose Multiple FRUs: When the
adapter or the device has more than one FRU, the error
code could be caused by any of them. Before replacing
multiple FRUs, try removing or exchanging each FRU, one
by one in the designated sequence, to see if the symptoms
change.
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