Hitachi 53SDX01B Service Manual page 34

1.2 Comb filter operation check
Adjustment preparation
(1) Receive the color bar signal at the regular
tuning point.
(2) Set the CONTRAST control to MAX and the
other controls to center.
(3) Set the Al to OFF.
Adjustment procedure
(1) Check that between the color bars there are not
line dots every second color bar as shown in the
drawing.
A
A
Check A and line dots.
B
53/61SDX01B
A
B
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No Dots
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34