Hitachi CP-X1200W, Service Manual

Page: 8 / 97

7
CP-X1200(P5XLA) / CP-X1250(P5XMLA) / CP-X1200WA(P5XMLB)
/ PJ1165(P5XMB)
4-5 White balance adjustment (visual inspection)
Preparations
1. Perform these adjustments after the NRSH
adjustment described in Section 4-4.
2. Reset gamma correction before adjustment.
Place the cursor on [GAMMA] in the FACTORY
MENU, press the [RESET] key and select [DEFAULT].
Adjustment procedure
1. First, adjust the G color.
2. Select GAMMA, SB-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 29-tone
grayscale.
3. Adjust GAMMA, SB-CNT, and G: in the FACTORY
MENU so that brightness of 29 steps is best.
4. Don’t adjust GAMMA, SB-BRT, and G: in the
FACTORY MENU. Because we want to keep the
best contrast ratio.
5. Then adjust colors R and B.
6. Select GAMMA, SB-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 29-tone grayscale.
7. Adjust GAMMA, SB-BRT, R: and B: in the
FACTORY MENU so that low-brigtness white
balance is best.
8. Adjust GAMMA, SB-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 29 steps is best.
4-4 NRSH adjustment (vertical stripe adjustment)
Signals for internal adjustment
192
/255
168
/255
144
/255
120
/255
96
/255
72
/255
48
/255
24
/255
Adjustment procedure
1. Make this adjustment after completing the
adjustment in 4-3 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 inconspicuous 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
FACTORY MENU to adjust vertical stripes of B color.
5. After completing this adjustment, return to Flicker
adjustment in 4-3 and make sure NRSH adjustment
has not affected Flicker performance. If it has become
worse, readjust the Ficker and the NRSH adjustments.