Apple lc 520.550.575 Servicehandbuch

 

 Troubleshooting

Symptom Charts/Video

 

 (Continued)

 

 - 7

 

Raster not centered

1 Verify that adjacent computer equipment is properly 

grounded. Move electrical devices away from monitor. 

Temporarily shut off all fluorescent lights in area.

2 Adjust horizontal or vertical center control. Refer to 

Adjustments chapter.

3 Replace analog board. 

Raster distorted 

(barrel-shaped, 

corners not square, 

stretched or 

compressed at top of 

display, or sides not 

perpendicular)

1 Verify that adjacent computer equipment is properly 

grounded. Move electrical devices away from monitor. 

Temporarily shut off all fluorescent lights in area.

2 Perform appropriate geometric adjustments. Refer to 

Adjustments chapter.

3 Replace analog board. 

4 Replace CRT (only in rare instances).