Acer 7520 Bedienungsanleitung PDF herunterladen (Seite 106)

92 Chapter 4

Undetermined Problems

The diagnostic problems does 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 non-defective FRU).

NOTE: Verify that all attached devices are supported by the computer.

NOTE: Verify that the power supply being used at the time of the failure is operating correctly. (See “Power

System Check” on page 77.):

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:

q Non-Acer devices

q Printer, mouse, and other external devices

q Battery pack

q Hard disk drive

q DIMM

q CD-ROM/Diskette drive Module

q PC Cards

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 FRU one at a time. Do not replace a non-defective FRU:

q System board

q LCD assembly

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Acer 7520 Bedienungsanleitung Seite 106