Hitachi CP-X880 Service Manual page 7

4-5 White balance adjustment (visual inspection)
Preparations
1. Perform these adjustments after the NRSH
adjustment described in Section 4-4.
Adjustment procedure
1. First, adjust the G color.
2. Select GAMMA, SUB-CONTRAST, and G: in the
Adjust menu. If the background is white solid,
press the [ENTER] key on the Remote control
transmitter to change to [G] monochrome in the
28-tone grayscale.
3. Adjust GAMMA, SUB-CONTRAST, and G: in
the Adjust menu so that brightness of 28 steps
is best.
4. Don't adjust GAMMA, SUB-BRIGHT, and G: in
the Adjust menu. Because we want to keep the
best contrast ratio.
5. Then adjust colors R and B.
Adjustment operations (reference)
SUB-CONTRAST operation
0 14 29 43
Input signal (%)
CP-X880/CP-X885
SUB-BRIGHT operation
0 14
75 86 93 100
2. Reset gamma correction before adjustment.
Place the cursor on [GAMMA] in the Adjustment
menu, press the [RESET] key and select
[DEFAULT].
6. Select GAMMA, SUB-CONTRAST, and G: in the
Adjust menu. If the background is white solid,
press the [ENTER] key on the Remote control
trasmitter to change to [W] monochrome in the
28-tone grayscale.
7. Adjust GAMMA, SUB-BRIGHT, R: and B: in the
Adjust menu so that low-brigtness white
balance is best.
8. Adjust GAMMA, SUB-CONTRAST, R: and B: in
the Adjust menu so that middle-brightness white
balance is best.
9. Repeat steps 7 to 8 above, and adjust so that
brightness white balance of 28 steps is best.
29 43 75 86 93 100
Input signal (%)
7