Hitachi CP-DX250 Service Manual page 24

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
Cal R Offset
Cal G Offset
Cal B Offset
Cal R Gain
Cal G Gain
Cal B Gain
YPbPr R Offset
YPbPr B Offset
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
32 Gray pattern
Value
512
512
512
1024
1024
1024
512
512
23
Pattern: A near white color (240/255, 240/255, 240/255)
and a near black color (16/255, 16/255, 16/255)