BenQ PB8250 - XGA DLP Projector, Service Manual

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4. S-Video and HDTV Color Adjustment Procedure
Equipment:
-
Pattern generator (VG-828)
-
Lux meter ( CL-100) or CA 120
Procedure:
(a) S-video adjustment(current source is S-video)
(1)
color spec x: 0.281
±
0.015 y: 0.297
±
0.015
(2)
Change Timing and Pattern of pattern generator
Timing:480i (60Hz)
Pattern:80% Gray pattern
(3)
Adjust R.G.B 9300K Gain to match spec
(b) Get spec for YpbPr (current source is S-video)
(1) Change Timing and Pattern of pattern generator
Timing:480i (60Hz)
Pattern:25% Gray pattern
(2) Read x value
Î
x0 ,read y value
Î
y0
(c) Ypbpr Offset adjustment(current source is YpbPr)
(1) color spec x: x0
±
0.010 y: y0
±
0.010
(2) The variance of color coordinate via Pb offset and Pr offset:
x y
Pb offset
↓
x
↓
y
↓
Pb offset
↑
x
↑
y
↑
Pr offset
↓
x
↑
y
↓
Pr offset
↑
x
↓
y
↑
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