Apple color classic Manual Do Serviço

 

 Troubleshooting

Symptom Charts/Video

 

 (Continued)

 

 - 8

 

Raster distorted 

(barrel-shaped, 

corners not square, 

stretched or 

compressed at top of 

display, or sides not 

perpendicular)

1 Verify that distortion is not due to environmental conditions 

(move monitor to different location). Refer to “Monitor 

Distortion” in Basics chapter of any large-screen monitor 

manual.

2 Perform appropriate geometric adjustments.

3 Replace analog board. 

4 Replace CRT (only in rare instances).

Raster not centered

1 Verify that distortion is not due to environmental conditions 

(move monitor to different location). Refer to “Monitor 

Distortion” in Basics chapter of any large-screen monitor 

manual.

2 Adjust horizontal or vertical center control. Refer to 

Adjustments chapter.

3 Replace analog board.