Apple macintosh plus 服务手册

 

 Troubleshooting

Symptom Charts/Video - 2

 

Symptom Charts

 

No video, but audio 

tone is present and 

drive operates

1 Turn contrast control fully clockwise.

2 Check video cable connections.

3 Replace power supply board.

4 Replace neck cable.

5 Replace logic board. Retain customer’s SIMMs.

Screen is bright and 

audio is present, but 

no video information 

is present

1 Replace power supply board.

2 Replace logic board. Retain customer’s SIMMs.