ViewSonic PJ452 Service Manual - Page 10

4-5 Flicker adjustment (V.COM adjustment) Signals for internal adjustment 4-6 NRSH adjustment (vertical stripe adjustment) Signals for internal adjustment 64 /255 88 /255 112 /255 136 /255 160 /255 Press ENTER key 160 136 112 88 64 /255 /255 /255 /255 /255 4-7 White balance adjustment (visual inspection) Preparations 1. Perform these adjustments after the NRSH adjustment described in Section 4-6. 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 FACTORY 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. Adjustment procedure 1. Make this adjustment after completing the adjustment in 4-4 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. Adjustment procedure 1. Make this adjustment after completing the adjustment in 4-5 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 Adjustment menu to adjust vertical stripes of B color. 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. ViewSonic Corporation Confidential - Do Not Copy PJ452 7