Gamma Correction Adjustment - Panasonic PT-TW230U Service Manual

Electrical Adjustments
6. Common center adjustment
Input mode Computer 1 (RGB)
Input signal XGA computer signal
Signal patterns 50% R, G, B whole signals
1. Enter the service mode
100
2. Select Group " ", No. "
0 2
value from " " to " " to reduce the panel frequency.
3. Change data value to obtain the minimum flicker for
each color on the screen.
Group - No. Adjustment
101 - 1 for green flicker
101 - 0 for red flicker
101 - 2 for blue flicker
100
4. Select Group " ", No. "
2 0
value from " " to " " to reset the panel frequency.
7. 50% white adjustment [PC]
Equipment
Input mode
Input signal
Input patterns
1. Enter the service mode.
2. Input the 100%-white computer signal and measure
illuminance on the screen with the illuminance meter.
A
It is for the reading of illuminance meter.
3. Change the signal source to the 50%-white computer
signal.
100
4. Select Group " ", No."
ue to make the reading of illuminance meter to be
x 22%
.
8. White balance adjustment [PC]
Input mode
Input signal
Signal patterns
1. Enter the service mode.
100
2. Select Group " ", No. "
change Data values respectively to make a proper
white balance.
Group - No. Adjustment
101 - 7 Color balance Red
101 - 8 Color balance Blue
92
" and change the data
92
" and change the data
Illuminance meter
Computer1 (RGB)
XGA computer signal
100%-white and 50%-gray sig-
nals
6
" and change the data val-
Computer 1 (RGB)
XGA computer signal
16-step gray signals
7 8
" (Red) or " " (Blue), and

9. Gamma correction adjustment

Software PROJECTOR SERVICE TOOL v4.20
Use the software to obtain the proper gray scale of the
screen. See the further information of the software in-
struction manual.
10. Color shading correction adjustment
Software PROJECTOR SERVICE TOOL v4.20
Signal pattern
Use the software to correct the color shading of the
screen. See the further information of the software in-
struction manual.
The color shading correction adjustment for this model
should be performed with the whole-gray patterns speci-
fied as above.
Corresponding to the pull-down menu of the gray level
selector on the software.
Level 0 :6%
Level 384 :13%
Level 640 :25%
Level 1032 :50%
Relation of level (%) indication and signal pattern
0% :Black
100% :White
A
-39-
6%, 13%, 25%, 50% whole gray