Hitachi CP-X980W Service Manual page 8

CP-X980W
CP-X985W
4 - 4 NRSH adjustment
Signals for internal adjustment
24 48 72 96
/255 /255 /255 /255
bit bit bit bit
4 - 5 White balance adjustment
Preparations
1. Perform these adjustment after the NRSH
adjustment described in Section 4-4.
2. Reset gamma correction before adjustment.
Place the cursor on [GAMMA] in the Adjustment
menu, press the [RESET] key and select
[DEFAULT].
Adjustment procedure
1. First, adjust the G color.
2. BRIGHT and CONTRAST set to MAX in the Setup menu.
3. Place the cursor on Slide Show in the Adjustment
menu [A/D], press the [ ] key three times to display
G monochrome and adjust the illuminance at the
center of the screen. Make a note of the setting (here
assumed to be A [lx]). Press the MENU key to return.
4. BRIGHT and CONTRAST is returned to default in the
Setup menu.
5. Adjust Gamma, 93%, and G: in the Adjust menu so
that illuminance (Y) at the center of the screen is
adjusted as follows.
Y = A x 0.84 2 [%]
6. Adjust Gamma, 86%, and G: in the Adjust menu so
that illuminance (Y) at the center of the screen is
adjusted as follows.
Y = A x 0.71 2 [%]
8
(vertical stripe adjustment)
120 144 168 192
/255 /255 /255 /255
bit bit bit bit
Adjustment procedure
1. Make this adjustment after completing the
adjustment in 4-3 Flicker adjustment.
2. Use DAC-P - NRSH - R: in the Adjustment menu to
adjust so that the vertical lines spaced every 12 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
Adjustment 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.
Now press the [RESET] key again and press the
[MGNIFY-OFF] button of the Remote control
transmitter for 5 seconds or more (the confirming
to "MICRO" reset menu will appear).
7. Adjust Gamma, 75%, and G: in the Adjust menu so
that illuminance (Y) at the center of the screen is
adjusted as follows.
Y = A x 0.53 2 [%]
8. Adjust Gamma, 43%, and G: in the Adjust menu so
that illuminance (Y) at the center of the screen is
adjusted as follows.
Y = A x 0.155 2 [%]
9. Adjust Gamma, 29%, and G: in the Adjust menu so
that illuminance (Y) at the center of the screen is
adjusted as follows.
Y = A x 0.0635 2 [%]
10.Adjust Gamma, 14%, and G: in the Adjust menu so
that illuminance (Y) at the center of the screen is
adjusted as follows.
Y = A x 0.015 2 [%]