BenQ PE8700 - DLP Projector - HD, Service Manual

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5.3 Gray Level for Composite Video & S-Video
Equipment:
-
Pattern generator (VG-828)
-
Lux meter ( CL-100)
OSD Default value:
Item Value Item Value
USER>Picture>
Brightness 30
Factory> SD
Contrast 17 Brightness 158
Color 23 Contrast 75
Tint 15 Saturation 91
Sharpness 3 Hue 0
Filter 3
Color Temp 2
Procedure:
(a) Gray Level
1. Connect power, Composite video or S-Video, into projector.
2. Change Timing and pattern of pattern generator :
Timing : NTSC(H:15.73 KHz,V:29.96 Hz)
pattern : gray 32( or gray16 only for overscan)
3. Light on projector
4. Set user OSD values to default.
5.
Enter factory mode.
6.
Set Factory values to default.
7. Adjust the Brightness and Contrast to let the black level to just distinguish, and the light
output of white level to just max.
8. Check the 32 levels of gray. All steps must appear,
(b). Saturation Level:
9. Change Timing and pattern of pattern generator :
Timing : NTSC(H:15.73 KHz,V:29.96 Hz)
pattern : 100% blue
10. Adjust saturation and use lux meter to measure to let the light output just max.
11. Select “Save Setting” at “Factory OSD>Factory>”.
6. Additional Patterns used for color final check
(a). Pattern 1: 0 ~ 14% gray, 2% change per step, (For DVI-A, YPBPR inputs)
Criteria: All gray bars should have the same color. Brightness change should be linear.
(b) Pattern 2: 16-gray (0 ~ 100%), For all input sources
Criteria: All gray bars should have the same color. Brightness change should be linear.