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159
Modem
Intermittent problems
Intermittent system hang problems can be caused by a variety of reasons that have
nothing to do with a hardware defect. These reasons include: cosmic radiation,
electrostatic discharge, or software errors. FRU replacement should be considered only
when a recurring problem exists.
To analyze an intermittent problem:
1 Run the advanced diagnostic test for the system board in loop mode at least ten
times.
• If any error is detected, replace the FRU.
• If no error is detected, do not replace any FRU.
2 Rerun the test to verify that there are no more errors.
Undetermined problems
If the diagnostic test may not identify which adapter or device failed, which installed
devices are incorrect, whether a short circuit is suspected, or whether the system is
inoperative. Use these procedures to isolate the failing FRU (do not isolate a non-defective
FRU).
To isolate a failing FRU:
1 Turn off the notebook.
2 Visually check FRU parts for damage. If you identify any damage, replace the FRU.
3 Remove or disconnect all of the following devices:
Symptom / Error Action in Sequence
The internal modem does not work correctly.
■
Test the modem phone port.
■
Test or replace the modem card.
■
Test or replace the system board.
Important
If you cannot find a symptom or an error in this list and the problem remains, see
“Undetermined problems” on page 159.
Important
Verify that all attached devices are supported by the notebook.
Important
Verify that the power supply being used at the time of the failure is operating correctly.
(See “Testing the power system” on page 145.)
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