Apple color classic Service Manual

 

 Troubleshooting

Symptom Charts - 6

 

Flashing or wavy 

screen or monitor 

emits high-pitched 

noise

Replace analog board.

Raster size too short/

tall or narrow/wide

1 Adjust horizontal or vertical size control. Refer to 

Adjustments chapter.

2 Replace analog board. 

Linearity bad (size of 

text/graphics differs 

at top, bottom, or 

sides of screen)

Replace analog board.