Acer 8940 manual Intermittent Problems, USB Right Up/Down Side Failure, Other Failures

USB (Right Up/Down Side) Failure

If the right-side USB fails, perform the following actions one at a time to correct the problem. Do not replace non-defective FRUs:

Start

OK

Check USB/B to	NG	Re-assemble the
		USB/B cable to M/B
M/B cable

OKOK

	NG	Swap USB/B and
Check USB/B		USB cable

Swap M/B

Other Failures

If the CRT Switch, Dock, LAN Port, external MIC or Speakers, PCI Express Card, 5-in-1 Card Reader or Volume Wheel fail, perform the following general steps to correct the problem. Do not replace non-defective FRUs:

1.Check Drive whether is OK.

2.Check Test Fixture is ok.

3.Swap M/B to Try.

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 FRU.

3.If any error is detected, replace the FRU. Rerun the test to verify that there are no more errors.

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