BenQ PB8250 Service Manual page 72

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)
Timing:480i (60Hz)
Pattern:25% Gray pattern
(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:
Pb offset ↓ x ↓
Pb offset ↑ x ↑
Pr offset ↓
Pr offset ↑
(1) Change Timing and Pattern of pattern generator
(2) Read x value
x
x ↑
x ↓
x0 ,read y value
y
y ↓
y ↑
y ↓
y ↑
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y0