Hitachi SM0541 Service Manual page 6

4-3 Flicker adjustment (V.COM adjustment)
Signals for internal adjustment
4-4 NRSH adjustment (vertical stripe adjustment)
Signals for internal adjustment
160 136 112
/255 /255 /255
64/255
88/255
112/255
136/255
160/255
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 colour.
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 29-tone greyscale.
3. Adjust GAMMA, SUB-CNT, and G: in the FACTORY
MENU so that brightness of 29 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 colours R and B.
CP-S235 (C10SM2)
88 64
/255 /255
Adjustment procedure
1. Make this adjustment after completing the
adjustment in 4-2 Ghost adjustment.
2. Use DAC-P - V.COM - R: in the FACTORY MENU
to adjust so that the flicker at the centre 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 centre
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 colour flicker.
4. In the same way, use DAC-P - V.COM-B: in the
FACTORY MENU to adjust the B colour flicker.
Adjustment procedure
1. Either of adjustment patterns as shown on the left
appears, which depends on the firmware version.
If any other pattern is displayed, press the
[ENTER] key on the remote control.
2. Use the DAC-P - NRSH - R: in the FACTORY MENU to
adjust so that the vertical stripes with one pixel width
every 6 pixels are as inconspicuous as possible.
(Note that when the adjustment value is lowered, stripes
with 6 pixels width every 12 pixels may appear on the
right side of the darkest or the 2nd darkest tone. Should
this happen, make as inconspicuous stripes as possible
on the whole screen.)
3. In the same way, use DAC-P - NRSH - G: in the
FACTORY MENU to adjust vertical stripes of G colour.
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 29-tone greyscale.
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 29 steps is best.
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