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Peripheral Device Related Symptoms
Symptom/Error FRU/Action
External display does not
work correctly.
1. See “External Display
Self-Test” in the
“Common Devices
Checkout” section.
Printer problems. 1. Run Printer Self-test.
2. System Board
3. Parallel Port Device
4. Cable
Serial or parallel port device
problems.
1. Device
2. Device Cable
3. System Board
Other Symptoms
Note: If you cannot find a symptom or error in this list
and the problem remains, see “Undetermined
Problems.”
Symptom/Error FRU/Action
PCMCIA slot pin is
damaged.
1. System Board
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. FRUs replacement should only be
considered when a recurring problems 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 no more
errors exist.
Undetermined Problems
You are here because the diagnostic tests did not identify
which adapter or device failed, installed devices are
incorrect, a short circuit is suspected, or the system is
inoperative. Follow the procedures below to isolate the
failing FRU (do not isolate non-defective FRUs).
Verify that all attached devices are supported by the
computer.
Verify that the power supply being used at the time of the
failure is operating correctly. (See “Power Systems
Checkout” on page 29.)
1. Power-off the computer.
42 IBM Mobile Systems HMM