Apple macintosh plus Manuale Di Servizio

 

 Troubleshooting

Symptom Charts/Drives

 

 (Continued)

 

 - 5

 

Audio tone sounds at 

power on, video is 

present, but drive 

does not operate

1 Replace floppy drive cable.

2 Replace floppy drive.

3 Replace logic board. Retain customer’s SIMMs. 

Drive runs 

continuously

1 Replace bad disk.

2 Replace floppy drive cable.

3 Replace floppy drive.

4 Replace logic board. Retain customer’s SIMMs.

400K drive does not 

boot

1 If logic board has Rev. A ROMs and drive stepper motor is 

serial number F518 or higher, upgrade to Rev. B ROMs.

2 Replace floppy drive.