Lenovo ThinkPad 600E Hardware Maintance Manual - June 1999: ThinkPad 600, 600E - Page 70

Power-Related Symptoms, Other Symptoms, Intermittent Problems, Undetermined Problems

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Symptom-to-FRU Index Power-Related Symptoms Symptom / Error Power shuts down during operation. The system does not power off. (See "Reset Switch" on page 23.) FRU / Action in Sequence 1. Go to "Power Systems Checkout" on page 35. 2. Battery pack 3. Remove the battery pack and let it cool for 2 hours. 4. System board 5. Check the power outlet. 1. Press the power shutdown switch. 2. System board Other Symptoms Symptom / Error Errors occur only when the port replicator is used. PC Card slot pin is damaged. FRU / Action in Sequence See "Port Replicator Checkout" on page 35. 1. PC Card slots assembly Note If you cannot find a symptom or an error in this list and the problem remains, see "Undetermined Problems" 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 be considered only when a recurring problem exists. When analyzing an 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 these procedures to isolate the failing FRU (do not isolate nondefective FRUs). 64

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Symptom-to-FRU Index
Power-Related Symptoms
Symptom / Error
FRU / Action in Sequence
Power shuts down during
operation.
1.
Go to “Power
Systems Checkout”
on page
35.
2.
Battery pack
3.
Remove the battery
pack and let it cool for
2 hours.
4.
System board
5.
Check the power
outlet.
The system does not power
off.
(See “Reset Switch” on
page 23.)
1.
Press the power
shutdown switch.
2.
System board
Other Symptoms
Note
If you cannot find a symptom or an error in this list
and the problem remains, see “Undetermined
Problems”
Symptom / Error
FRU / Action in Sequence
Errors occur only when the
port replicator is used.
See “Port Replicator
Checkout” on page
35.
PC Card slot pin is
damaged.
1.
PC Card 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 be
considered only when a recurring problem exists.
When analyzing an 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 these procedures to isolate the failing
FRU (do not isolate nondefective FRUs).
64