Lenovo ThinkPad 770 Hardware Maintenance Manual for 770 series notebooks(Janua - Page 72

Other Symptoms, Intermittent Problems, Undetermined Problems, Device in UltraBay II FDD, CD-ROM

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SYMPTOM-TO-FRU INDEX Other Symptoms Symptom / Error Errors occur only when the port replicator is used. FRU / Action in Sequence See "Port Replicator Checkout" on page 35. 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). 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 36): 1. Power off the computer. 2. Visually check them for damage. If any problems are found, replace the FRU. 3. Remove or disconnect all of the following devices: a. Non-IBM devices b. Devices attached to the port replicator c. Printer, mouse, and other external devices d. Battery pack e. Hard disk drive f. External diskette drive g. DIMM h. Device in UltraBay II (FDD, CD-ROM, or DVD) i. PC Cards 4. Power on the computer. 66

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SYMPTOM-TO-FRU INDEX
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.
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).
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
36):
1.
Power off the computer.
2.
Visually check them for damage.
If any problems are
found, replace the FRU.
3.
Remove or disconnect all of the following devices:
a.
Non-IBM devices
b.
Devices attached to the port replicator
c.
Printer, mouse, and other external devices
d.
Battery pack
e.
Hard disk drive
f.
External diskette drive
g.
DIMM
h.
Device in UltraBay II (FDD, CD-ROM, or DVD)
i.
PC Cards
4.
Power on the computer.
66