Apple lc 580.performa 580cd 服务手册
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Troubleshooting
Symptom Charts/Miscellaneous
(Continued)
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Miscellaneous
(Continued)
Screen shows “Sad
Macintosh” icon and
black vertical lines;
screeching sound
1 Replace RAM SIMMs on logic board.
2 Replace logic board. Retain customer’s SIMMs.
Headphone jack does
not operate correctly
1 Verify that headphone jack is seated properly.
2 Replace front panel control board.
3 Replace chassis harness assembly.
No sound from
external speakers
1 Check that volume is turned on (manually or through Control
Panel).
2 Verify that headphones are unplugged.
3 Verify that speaker connectors are properly connected.
4 Test speakers with known-good Macintosh; if speakers do not
work, replace them.
5 Replace logic board.