Lenovo ThinkPad 380ED TP 380Z Hardware Maintenance Manual (August 1998) for us - Page 34

Other Symptoms, Intermittent Problems, Undetermined Problems, at least 10 times

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Symptom / Error Power shuts down during operation. The system does not power off. (See "Reset Switch" on page 7.) FRU / Action in Sequence 1. Go to "Power Systems Checkout" on page 13. 2. Battery pack 3. Remove the battery pack and let it cool for 2 hours. 4. DC/DC card 5. System board 6. Check the power outlet. 1. Press the Reset switch. 2. DC/DC card 3. 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 18. 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 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 these procedures to isolate the failing FRU (do not isolate nondefective FRUs). Verify that all attached devices are supported by the computer. 32

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Symptom / Error
FRU / Action in Sequence
Power shuts down during
operation.
1.
Go to “Power
Systems Checkout”
on page
13.
2.
Battery pack
3.
Remove the battery
pack and let it cool for
2 hours.
4.
DC/DC card
5.
System board
6.
Check the power
outlet.
The system does not power
off.
(See “Reset Switch” on
page 7.)
1.
Press the Reset
switch.
2.
DC/DC card
3.
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
18.
PC Card slot pin is
damaged.
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 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 these procedures to isolate the failing
FRU (do not isolate nondefective FRUs).
Verify that all attached devices are supported by the
computer.
32