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Infrared-Related Symptoms
Symptom / Error FRU / Action in Sequence
Unable to communicate
using the Infrared (IR) Port.
1. Make sure the setup
for the IR is correct.
2. Make sure there are
no fluorescent lights
near the computer.
The computer may
receive optical noise
from the fluorescent
light.
3. Reseat the IR unit.
4. Run the advanced
diagnostic test. If an
error occurs and a
FRU code is displayed,
replace the parts
shown by the FRU
code.
Other Symptoms
Note: If you cannot find a symptom or error in this list
and the problem remains, see “Undetermined
Problems” on page 371.
Symptom / Error FRU / Action in Sequence
Errors occur only when Port
Replicator is used.
See “Port Replicator
Checkout” in the
“Common Devices
Checkout” section.
PCMCIA slot pin is
damaged.
PCMCIA slots assembly
Intermittent Problems
Intermittent system hang problems can be caused by a
variety of reasons that have nothing to do with a hardware
defect, such as cosmic radiation, electrostatic discharge, or
software errors. FRU replacement should only be
considered when a recurring problem exists.
When analyzing the intermittent problem, do the following:
1. Run the advanced diagnostic test for the system
board in loop mode at least 10 times.
2. If no error is detected, do not replace any FRUs.
3. If any error is detected, replace the FRU shown by
the FRU code. Rerun the test to verify that there are
no more errors.
370 IBM Mobile Systems - ThinkPad HMM Volume 3