BenQ PE8700 service manual Procedure Black Level Adjustment DLP brightness

Procedure:

A. Black Level Adjustment: (DLP brightness)

1.	Change pattern of pattern generator :
	Pattern : Black (Gray 0)
2.	Adjust DLP Brightness to let the black picture to just distinguish.

B. White Level Adjustment: (AD contrast---R,G,B gain)

1.Change pattern of pattern generator : pattern : White (100% Gray)

2.Use Lux meter to measure the white level. Adjust the contrast value of AD9883 (RGB) to let the light output to just max.

3.Change to 32-gray (0 ~ 100%) pattern. All steps must appear,

C. Offset adjustment at low brightness (AD R, G, B offset)

1.Change Timing and pattern of pattern generator : pattern : 10% Gray

2.Set user color temp to 6500K.

3.Adjust AD9883 Red and Blue Offset to meet 6500K color spec.

D. Color Temperature at high brightness (Scalar Gamma R, G, B Gain)

1. Change Timing and pattern of pattern generator :

Timing : 800x600@60Hz (H:37.879Khz,V:60.317Hz) Pattern : 80% gray

2 Color temperature spec: CIE 1976 u’, v’ chromaticity)

Color temperature						5400°K	6500°K	7500°K
x =					27u'	0.333	0.312	0.296
	18u' − 48v' + 36
y =					12v'	0.333	0.329	0.316
		18u' − 48v' + 36
u ' =					4x	0.210	0.197	0.190
				− 2x + 12 y + 3
v ' =					9 y	0.473	0.468	0.459
				− 2x + 12 y + 3
			Deviation:			<=0.010	<=0.010	<=0.010
u’v’=					( ∆u' 2 + ∆v' 2

Color Temp 4 = color temp is the same as that of 6500K

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