Hitachi CP-X270W, Service Manual

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CP-X270W
4 - 2 Ghost adjustment
Signals for internal adjustment
30%
30%
96/255
bit
0/255
bit
Adjustment procedure
1. Use DAC-P - GHOST-W: in the Adjustment menu to
adjust so that ghost is at a minimum.
(Set the adjustment value to 16, then raise the
value. When a ghost appears to the left of a vertical
line, reduce the value by 2 steps.)
4 - 3 Flicker adjustment
(V.COM adjustment)
Signals for internal adjustment Adjustment procedure
1. Make this adjustment after completing the
adjustment in 4-2 Ghost adjustment.
2. Use DAC-P - V.COM - R: in the Adjust menu to
adjust so that the flicker at the center of the screen
is less than the flicker at the periphery.
(When the flicker is about the same across the
whole screen, adjust so that the flicker at the center
of the screen is somewhat less than elsewhere.)
If flicker adjustment is completed, [MENU SELECT]
button of the Remote control transmitter will be
pressed and it will change to a screen for the
vertical band adjustment.
When the vertical band is conspicuous, adjust to the
best point by less than 3 points from flicker
adjustment value.
3. In the same way, use DAC-P - V.COM - G: in the
Adjustment menu to adjust the G color flicker.
4. In the same way, use DAC-P - V.COM - B: in the
Adjustment menu to adjust the B color flicker.
4. Adjustment
4 - 1 Before adjusting
1. Before starting adjustment, warm up the projector
for about 10 min. (Blank white)
2. Set Zoom Wide to Max. and project an image a
distance of 40 inches.
3. Normalizing the video adjustment.
(Press the [MENU] button of the Remote control
transmitter to display the Setup menu, then press
the [RESET] button.)
*note : The setup menu is not displayed on with no signal.
4. Perform all adjustments from the Adjustment menu.
Perform the following operations to display the
Adjustment menu.
a. Press the [MENU] button of the Remote control
transmitter (the Setup menu will appear).
b. Next, press the [RESET] button for 5 sec. or
more (the Adjustment menu will appear).