Lenovo ThinkPad 390E Hardware Maintenance Manual (March 1999): ThinkPad 390E o - Page 57

Undetermined Problems, CD-ROM and Diskette Drive FDD ASM in

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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, which installed devices are incorrect, whether a short circuit is suspected, or whether the system is inoperative. Follow these procedures to isolate the failing FRU (do not isolate nondefective FRUs). Verify that the power supply being used at the time of the failure is operating correctly. (See "Power System Checkout" on page 33). 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 ThinkPad Port Replicator with Advanced Etherjet Feature c. Printer, mouse, and other external devices d. Battery ASM e. Hard disk drive f. DIMM g. CD-ROM and Diskette Drive (FDD ASM) in the Combobay (UltraBay FX) h. PC Cards (PCMCIA) 4. Power on the computer. 5. Determine if the problem has changed. 6. If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU. 7. If the problem remains, replace the following FRUs one at a time. Do not replace a non-defective FRU. a. System board b. LCD panel ASM c. CPU card ThinkPad 390E 47

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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, which installed devices are
incorrect, whether a short circuit is suspected, or whether
the system is inoperative. Follow these procedures to
isolate the failing FRU (do not isolate nondefective FRUs).
Verify that the power supply being used at the time of the
failure is operating correctly. (See “Power System
Checkout” on page
33).
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 ThinkPad Port
Replicator with Advanced Etherjet Feature
c.
Printer, mouse, and other external devices
d.
Battery ASM
e.
Hard disk drive
f.
DIMM
g.
CD-ROM and Diskette Drive (FDD ASM) in the
Combobay (UltraBay FX)
h.
PC Cards (PCMCIA)
4.
Power on the computer.
5.
Determine if the problem has changed.
6.
If the problem does not recur, reconnect the removed
devices one at a time until you find the failing FRU.
7.
If the problem remains, replace the following FRUs
one at a time. Do not replace a non-defective FRU.
a.
System board
b.
LCD panel ASM
c.
CPU card
ThinkPad 390E
47