Hitachi CP-X2520 Service Manual page 6

4-5 PSIG adjustment (vertical bars adjustment)
Test pattern for the adjustment
160 136
/255 /255
4-6 White balance adjustment (visual inspection)
Preparations
1. Perform these adjustments after the adjust-
ments described in Section 4-5.
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 33-tone grayscale.
3. Adjust GAMMA, SB-CNT, and G: in the FAC-
TORY MENU so that brightness of 33 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.
CP-X2520 ( M2-25ED ) / CP-X3020 ( M2-30ED )
64
/255
88
/255
112
/255
136
/255
160
/255
Press ENTER key
112 88 64
/255 /255 /255
Adjustment procedure
1. Make this adjustment after completing the ad-
justment in the section 4-4.
2. Use DAC - P_PSIG - R : in the FACTORY MENU
and use it so that vertical bars are minimized.
3. In the same way, use DAC - P_PSIG - G : in the
FACTORY MENU and use it so that vertical
bars are minimized.
4. In the same way, use DAC - P_PSIG - B : in the
FACTORY MENU and use it so that vertical
bars are minimized.
2. Reset gamma correction before adjustment.
Place the cursor on [GAMMA] in the FACTORY
MENU, press the [RESET] key and select RESET.
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 to change to [W]
monochrome in the 33-tone grayscale.
7. Adjust GAMMA, SB-BRT, R: and B: in the FAC-
TORY MENU so that low-brightness white bal-
ance is best.
8. Adjust GAMMA, SB-CNT, R: and B: in the FAC-
TORY 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.
6