Hitachi 53SWX10B, Service Manual

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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 PERFECT PICTURE to OFF.
Adjustment procedure
(1) Check that between the color bars there are line dots
every second color bar as shown in the drawing.
A A A
B
LINE DOT
A X
B X
Check and line dots.
B
A
1.3 Video Settings (Advanced Settings)
1.3.1 Perfect Picture Check
(1) Receive the color bar signal.
(2) Select video mode by THUMB STICK cursor.
(3) Use THUMB STICK
to highlight advanced settings
and then press THUMB STICK to enter Advanced
Settings Mode.
(4) Select Perfect Picture by pressing THUMB STICK .
(5) Check that the display becomes dark when the light
sensor QM002 (light detect transistor on the control
P.W.B.) is covered with hands.
(6) Set Perfect Picture to OFF by pressing select button
and check that contrast of the display returns to
normal.
1.3.2 Auto Color Check
(1) Set to the color control to MAX.
(2) Select Auto Color.
(3) Set Auto Color: OFF by pressing select button and
check the red part of color bar signal grows deeper.
(4) Retrun to Auto Color: ON by pressing select button.
(5) Retrun the color control to center.
1.3.3 Noise Reduction Check
(1) Receive the color bar signal.
(2) Select noise reduction.
(3) Check that the noise in the picture is reduced.
1.3.4 Color Temperature Check
(1) Receive Circle pattern signal.
(2) Select COLOR TEMPERATURE.
(3) Check that the picture is reddish when set to WARM
and bluish when set to COOL.
1.3.5 Velocity Modulation Check
(1) Select VELOCITY MODULATION.
(2) Check that the edge of the vertical line of the picture
is thicker.
1.3.6 Black Level Expansion Check
(1) Select BLACK LEVEL EXPANSION.
(2) Check that the Black Level is sink at black portion of
picture.