Hitachi CP-X940E, Service Manual

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4. Adjustment
4 - 1 Before adjusting.
4-1-1 ADJUSTMENT menu.
The ADJUSTMENT menu is needed at all adjust-
ments.
How to set up ADJUSTMENT menu follow these;
a. Push the MENU button.
b. Keep the RESET button pushing for a several
seconds while the PICTURE menu is displayed.
Note: All parameters used in these adjustment are
printed in boldface as shown in Fig.4-2-a and
Fig.4-2-b.
ADJUSTMENT
menu
PICTURE
menu
4-1-3 Setting of condition before adjustment.
1. Apply heat-running for 10 minutes or more before
adjustment.
2. Project 40 inches size image with zoom set to the
widest.
3. Press the RESET button on the remote controller to
set picture adjustment to NORMAL.
4. Use a darkroom whose luminance is less than 2[lx].
VIDEO GAMMA DAC_P S/H
AIR-FLOW
SUB-BRIGHT
SUB-CONTRAST
WHITE-POSI
BLACK2-POSI
V. COM
C.UNIFORMITY
Fig.4-2-a Parameters in the DAC_P of
the ADJUSTMENT menu.
Fig.4-1 ADJUSTMENT menu
VIDEO GAMMA DAC_P S/H
S/H TIMING
GHOST
SUB H POSI
REFRESH
Fig.4-2-b Parameters in the S/H of the
ADJUSTMENT menu.
4-1-2 Selection of adjustment.
When any parts in the table 4-1 is changed, choose
the profer adjusting items with the chart. Keep the
adjusting order, from upper to lower in it. For example,
adjust "White balance" firstly and "Ghost" next at
replacement of the PWB ass'y color.
Replaced part
Adjustment
P.O.filter
(Chap.4-2)
White balance
(Chap.4-3)
Ghost
(Chap.4-4)
Dichroic optics unit Yes No No
LCD/LENS prism ass'y Yes Yes Yes
PWB ass'y drive No Yes Yes
PWB ass'y color No Yes No
"Yes" means need for adjustment, "No" means no need for adjustment.
Table 4-1 : Relation between the replaced part and adjustment.