Apple color classic Instruction De Maintenance
Troubleshooting
Symptom Charts/Video
(Continued)
- 8
Video
(Continued)
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.