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Audio Related Symptoms
The following are the audio input sources:
Line In
Mic In
System board
CD-ROM
Audio card
Note: Use either a data or music CD to check the audio
function. If the audio fails see “Audio Card Checkout” on
page 34.
Peripheral Device Related Symptoms
Symptom/Error FRU/Action
External display does not
work correctly.
1. See “External Display
Self-Test” on
page 592.
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”
on page 49.
Symptom/Error FRU/Action
Errors occur only when Port
Replicator is used.
1. See “Port Replicator
Checkout” on
page 597.
PCMCIA slot pin is
damaged.
1. PCMCIA Socket
2. 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. FRU replacement should only be
considered when a recurring problems exits.
When analyzing the intermittent problem, do the following:
1. Run the diagnostic test for the system board in loop
mode at least 10 times.
2. If any error is detected, replace the FRU indicated.
Rerun the test to verify that no more errors exist.
48 IBM Mobile Systems - ThinkPad HMM Volume 3