Apple color classic Service Manual

 

 Troubleshooting

Symptom Charts - 4

 

Picture breaks into 

diagonal lines, or 

picture rolls 

vertically or 

horizontally

Replace analog board. 

Out of convergence 

(color bleeds from 

text or lines)

1 Perform convergence adjustment. Refer to “Convergence” in 

Adjustments chapter.

2 Replace analog board. 

3 Replace CRT. 

Black screen spots 

(burnt phosphors)

Replace CRT.