Apple Multiple Scan 20 Display Specifications download pdf (Page 35)

Troubleshooting Symptom Charts/Video

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Video

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Raster is too bright 1 Adjust brightness and contrast controls. See “User Controls”

in Adjustments.

2 Check B+ voltage and adjust if necessary. Refer to “B+

Voltage Adjustment” in Adjustments chapter.

3 Adjust screen control on flyback transformer. Refer to

“Screen Adjustment” in Adjustments chapter.

4 Replace main deflection board and CRT/video board module.

See “Main Deflection and CRT/Video Board Module” in Take

Apart chapter. See Adjustments chapter for non-user

adjustments that might be necessary after board replacement.

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Apple Multiple Scan 20 Display Specifications Page 35