Hitachi CPX270W Service Manual page 13

CP-X270W
12.Then measure the color coordinates for adjust-
ment point [No. 10] and adjust [No. 10] [R:] and [B:]
so that the color coordinates are as follows.
x = x1 0.010, y = y1 0.020
Similarly measure adjustment points [No. 11] to
[No. 17] and adjust their color coordinates starting
in order from the small number points.
Adjustment procedure 2 (visual inspection)
1. First adjust [MIN] tone [G:].
Unless there is conspicuous black shading, there is
no need to adjust. (Go to step 4 if no adjust-ment is
required.)
2. Adjust only [G:] of measurement points [No. 2] to
[No. 17] in number order to minimize color shading.
(Use the deviation range information for each
measurement point given below as reference.)
3. This completes [MIN] tone adjustments.
4. Then adjust [MAX] tone [G] color.
5. Select [No. 2] [G:].
If the background is [G] monochrome, press the
[MENU SELECT] key on the Remote control
transmitter to change to solid white.
6. View measurement point [No. 2] and [No. 3]. Lower
the [G] color intensity only of the color point whose
[G] color is more intense than measure-ment point
[No. 1].
7. View measurement point [No. 10] and [No. 11].
Lower the [G] color intensity only of the color point
whose [G] color is more intense than measure-
ment point [No. 1], and raise the intensity of the
point whose color intensity is lower than measure-
ment point [No. 1].
13.This completes [MAX] tone adjustments.
14.Now make similar adjustments for [MID] tone.
(Note that [G] color adjustment tolerance is 10
[lx].)
8. This completes adjustments for [MAX] tone [G].
9. Now adjust the [MAX] tone for colors [R] and [B].
10.View measurement points [No. 2], [No. 3], [No. 10]
and [No. 11]. Adjust the [R] and [B] of each
measurement point so that they have the same
color as measurement point [No. 1].
Adjustment technique :
First, adjust [B:] of the point whose color is to be
adjusted so that it approximates that of [No. 1]. If
[R:] is low at this time, the image will have cyan
cast, in which case [R:] is increased. On the other
hand, if [R:] is excessive, the image will have a
magenta cast, in which case [R:] is decreased.
Overall, a cyan cast makes it easy to see color
shading.
11.Next, view measurement points [No. 4], [No. 5],
[No. 12] and [No. 13] and make similar adjust-
ments.
12.Then adjust measurement points [No. 6], [No. 7],
[No. 8], [No. 9], [No. 14], [No. 15], [No. 16] and [No.
17]. This completes the [MAX] tone adjustment.
13.Make similar [MID] adjustments as described in
steps 4 to 12 above.
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