Apple macintosh plus 服务手册
Troubleshooting
Symptom Charts/Miscellaneous - 8
Miscellaneous
When turned on, the
Macintosh Plus
continuously beeps
and tries to power up
1 Perform voltage adjustment. Refer to Adjustments.
2 Disconnect internal disk drive. If this eliminates problem,
replace drive.
3 Replace logic board. Retain customer’s SIMMs.
4 Replace power supply board, logic board, and internal drive;
then turn on Macintosh. Note: Replacing only power supply
board may damage new power supply board.
Clicking or chirping
sound
1 Connect logic board cable.
2 Perform voltage adjustment. Refer to Adjustments.
3 Replace power supply board.
4 Replace logic board. Retain customer’s SIMMs.