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Apple 5420/180 Manuale Utente

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 Troubleshooting
Symptom Charts/Video - 11
 
Raster tilted or 
shifted
1 Refer to “First Checklist” in Troubleshooting chapter. Move 
metal objects away from monitor.
2 Perform appropriate geometric adjustments. Refer to 
“Geometry” in Adjustments chapter.
3 Replace analog/video board assembly. 
Raster distorted 
(barrel-shaped, 
corners not square, 
stretched or 
compressed at top of 
display, or sides not 
perpendicular)
1 Refer to “First Checklist” in Troubleshooting chapter. 
2 Perform appropriate geometric adjustments. Refer to 
“Geometry” in Adjustments chapter.
3 Install monitor-adjustment cable and use on-screen video 
adjustment controls to eliminate distortion. Based on video 
tolerances, some distortion is allowed and setting need not 
be perfect. Contact Apple Technical Support if you’re unsure 
about tolerance level.
4 Replace analog/video board assembly.