ViewSonic PJ452 - LCD XGA Projector-4.9LBS Service Manual page 10

4-5 Flicker adjustment (V.COM adjustment)
Signals for internal adjustment
4-6 NRSH adjustment (vertical stripe adjustment)
Signals for internal adjustment
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Press ENTER key
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4-7 White balance adjustment (visual inspection)
Preparations
1. Perform these adjustments after the NRSH
adjustment described in Section 4-6.
Adjustment procedure
1. First, adjust the G color.
2. Select GAMMA, SUB-CNT, and G: in the FACTORY
MENU. If the background is white solid, press the
[ENTER] key on the Remote control transmitter to
change to [G] monochrome in the 33-tone grayscale.
3. Adjust GAMMA, SUB-CNT, and G: in the FAC-
TORY MENU so that brightness of 33 steps is
best.
4. Don't adjust GAMMA, SUB-BRT, and G: in the
FACTORY MENU. Because we want to keep
the best contrast ratio.
5. Then adjust colors R and B.
ViewSonic Corporation
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Adjustment procedure
1. Make this adjustment after completing the
adjustment in 4-4 Ghost adjustment.
2. Use DAC-P - V.COM - R: in the FACTORY
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.)
3. In the same way, use DAC-P - V.COM-G: in the
FACTORY MENU to adjust the G color flicker.
4. In the same way, use DAC-P - V.COM-B: in the
FACTORY MENU to adjust the B color flicker.
Adjustment procedure
1. Make this adjustment after completing the
adjustment in 4-5 Flicker adjustment.
2. Use DAC-P - NRSH - R: in the FACTORY
MENU to adjust so that the vertical lines spaced
every 6 dots are as inconspicuous as possible.
(Reduce the adjustment value when black
stripes appear in the 2nd or 3rd tone from the
black side. Note that when the adjustment value
is lowered, white stripes may appear in the 2nd
or 3rd tone from the bright side. Should this
happen, adjust so that the stripes are as incon-
spicuous as possible.)
3. In the same way, use DAC-P - NRSH - G: in the
FACTORY MENU to adjust vertical stripes of G color.
4. In the same way, use DAC-P - NRSH - B: in the
Adjustment menu to adjust vertical stripes of B color.
2. Reset gamma correction before adjustment.
Place the cursor on [GAMMA] in the FACTORY
MENU, press the [RESET] key and select [DEFAULT].
6. Select GAMMA, SUB-CNT, and G: in the FACTORY
MENU. If the background is white solid, press the
[ENTER] key on the Remote control trasmitter to
change to [W] monochrome in the 33-tone grayscale.
7. Adjust GAMMA, SUB-BRT, R: and B: in the
FACTORY MENU so that low-brigtness white
balance is best.
8. Adjust GAMMA, SUB-CNT, R: and B: in the
FACTORY MENU so that middle-brightness
white balance is best.
9. Repeat steps 7 to 8 above, and adjust so that
brightness white balance of 33 steps is best.
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PJ452