Hitachi CP-DX250 guide, Service Manual

Page: 24 / 65

23
4.4.2 PC Alignment Procedure
Equipment
： ： ： ：
-
Pattern generator
(Notice: If uses PC, the signal level is calibrated to this PC)
OSD Default value
： ： ： ：
Item Value
Cal R Offset 512
Cal G Offset 512
Cal B Offset 512
Cal R Gain 1024
Cal G Gain 1024
Cal B Gain 1024
YPbPr R Offset 512
YPbPr B Offset 512
Procedure
：
： ：
：
1. Connect power cord, D-sub cable, and pattern generator(or PC) into projector
2. Turn on projector.
3. Change
Timing of pattern generator:
Timing: 1024*768 @60Hz (XGA models)
4. Change Pattern of pattern generator:
Pattern: A near white color (240/255, 240/255, 240/255) and a near black color
(16/255, 16/255, 16/255).
5. Press “Auto” to catch the full screen
6. Enter Factory Mode:
7. Choose Block 3 .
8. Press Left or Right key on "
Calibration RGB ".
The signal level, "16/255" and "240/255" are
caught and the ADC range, min and max level are
calculating from them.
9. Change Pattern of pattern generator to 32 levels
of Gray. Check the pattern if all steps appear.
10. Done
Pattern: A near white color (240/255, 240/255, 240/255)
and a near black color (16/255, 16/255, 16/255)
32 Gray pattern