Apple LC520 Specifiche Pagina 23

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Troubleshooting Symptom Charts/Video
(Continued)
- 5
Video
(Continued)
Screen jitters or
flashes
1 Verify that adjacent computer equipment is properly
grounded. Move electrical devices away from monitor.
Temporarily shut off all fluorescent lights in area.
2 Check that all ground cables are secure.
3 Disconnect internal floppy drive, CD-ROM drive, and hard
drive.
4 Replace analog board.
Out of focus 1 Perform focus adjustment. Refer to “Focus” in Adjustments.
2 Replace analog board.
3 Replace CRT only if one part of display remains out of focus
despite adjustment of focus controls to their limits.
Raster size too short/
tall or narrow/wide
1 Adjust horizontal or vertical size control. Refer to
Adjustments chapter.
2 Replace analog board.
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