Color Uniformity Adjustment - Hitachi CP-X880 Service Manual

4-6 Color uniformity adjustment

Preparations
1. Perform these adjustments after the white
balance adjustment described in Section 4-5.
2. Make a color uniformity adjustment for the
following four tones.
MIN tone (approx. 7% input signal)
MID-L tone (approx. 18% input signal)
MID-H tone (approx. 50% input signal)
MAX tone (approx. 75% input signal)
3. Place the cursor on the tone to be adjusted in
the Adjust menu and press the [ ] key. This
displays the Adjust Tone menu at the bottom of
the screen. Select the major adjustment lattice
point No. and color, and then adjust them.
4. The major adjustment lattice point numbers (a
total of 17 points) corresponds to the major
adjustment lattice point positions in the diagram
on the right. The color uniformity of the entire
screen can be adjusted by adjusting the white
balance for each of the points starting in order
from the low numbers.
5. Adjustment point No.1 should not be adjusted,
because it controls the brightness of the entire
screen.
Adjust menu
VID-AD
C. UNIF. LEVEL
DAC-P BLACK
GAMMA
STRIPE
Adjust Tone menu
No. 1 R
ON
Major adjustment lattice point No.
OFF
CP-X880/CP-X885
MIN
MID-L
MID-H
MAX
0 G 0 B 0
6. To temporarily turn correction off, place the
cursor on "ON" in the Adjust Tone menu and
press the [ ] key. To turn it on again, place the
cursor on OFF in the Adjust Tone menu and
press the [ ] key.
7. Although this adjustment can also be made
using internal signals, we will here use the
[ENTER] key on the Remote control transmitter
to select the following two signals.
Solid monochrome adjustment color (use G
color adjustment when a color differential
meter is used).
Solid white (use for adjustment other than above).
8. Reset color-shading correction before adjustment.
When 4 tones and all colors are to be reset,
p l a c e t h e c u r s o r o n [ C . U N I F. ] i n t h e
Adjustment menu, press the [RESET] key and
select [DEFAULT].
When only 1 tone is to be reset, place the
cursor on the tone to be reset, press the
[RESET] key and select [DEFAULT].
Single tone and monochrome resets cannot
be performed.
Major adjustment lattice point position
14
V/6
6
V/3
H/6 H/3
10
2
V/3
7
V/6
15
8
12 16
4 8
H/3 H/6
11
1 3
5 9
13 17