Hitachi C11XMB Service Manual page 7

4-4 Flicker adjustment (V.COM adjustment)
Signals for internal adjustment
4-5 White balance adjustment (visual inspection)
Preparations
1. Perform these adjustments after the Flicker
adjustment described in Section 4-4.
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.
CP-X444(C11XMB)/CP-X440(C11XM25)
7
Adjustment procedure
1. Make this adjustment after completing the
adjustment in 4-3 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.
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.