BenQ PB8220 - XGA DLP Projector, Service Manual

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II. Gray
Level:
1. Change Timing and pattern of pattern generator:
Timing: 480P (H: 31.54 KHz, V: 60.08 Hz)
Pattern: gray 32 (or gray16 only for over-scan)
2. Adjust the Brightness of AD9883 (RGB) to let the black level of the gray 32 to just
distinguish. Use Lux meter to measure the white level of the gray 32. Adjust the
contrast value of AD9883 (RGB) to let the light output to just max.
3. Check the 32 levels of gray. All steps must appear,
III. Saturation Level:
1. Change Timing and pattern of pattern generator:
Timing: 480 (H: 31.54 KHz, V: 60.08 Hz)
Pattern: 100% blue
2. Adjust saturation and use lux meter to measure to let the light output just max.
IV. Gamma Curve:
1. Change Timing and pattern of pattern generator:
Timing: NTSC (H: 15.73 KHz, V: 29.96 Hz)
Pattern: 100% blue
2. Adjust Gamma Index and Red/Green/Blue Gamma to fit mars YPbPr gamma curve.
7. PC Color Alignment Procedure
Equipment:
- Pattern generator (Chroma 2250)
- Lux
meter (CL-100)
OSD Default value:
Item Value Item Value
Brightness 0 Brightness Bias Adjustable
Contrast 0 Contrast Bias Adjustable
Filter 1 Red Gain Adjustabl
White Peak 10 Green Gain Adjustabl
Gamma Table Linear Blue Gain Adjustabl
Color Temp 0,1,2
7 3