BenQ PB8220 - XGA DLP Projector, Service Manual

Page: 78 / 112

Case
x1>x0 & y1>y0
Decrease Pb offset
until x<=x0 or
y<=y0
Case x<=x0:
The value note (x2,y2).
Dy = y2 - y0.
Decrease Pb offset until the y
value <= y2 - 1/2Dy . Now, the
reading of the Lux meter =
(x3,y3) and x3 will < x0, y3 will
> y0.
Decrease Pr offset the x value
will increase and y value will
decrease to meet the spec.
Increase Pr offset the x value will
decrease and y value will increase
to meet the spec.
Decrease Pb offset until the x
value <= x2 - 1/2Dx . Now, the
reading of the Lux meter =
(x3,y3) and x3 will > x0, y3 will
< y0.
Case y<=y0:
The value note (x2,y2).
Dx = x2 - x0.
Case
x1<x0 & y1<y0
Increase Pb offset
until x>=x0 or
y>=y0
Case x>=x0:
The value note (x2,y2).
Dy = y0 - y2.
Increase Pb offset until the y
value >= y2 + 1/2Dy . Now, the
reading of the Lux meter =
(x3,y3) and x3 will > x0, y3 will
< y0.
Increase Pr offset the x value will
decrease and y value will increase
to meet the spec.
Decrease Pr offset the x value
will increase and y value will
decrease to meet the spec.
Increase Pb offset until the x
value >= x2 + 1/2Dx . Now, the
reading of the Lux meter =
(x3,y3) and x3 will < x0, y3 will
> y0.
Case y>=y0:
The value note (x2,y2).
Dx = x0 - x2.
Case
x1>x0 & y1<y0
Increase Pr offset until
x<=x0 or y>=y0
A B C
D
Case x<=x0: Case y>=y0:
B C
Case
x1<x0 & y1>y0
Decrease Pr offset
until x>=x0 or y<=y0
Case x>=x0: Case y>=y0:
D A
Use Lux meter to
read the coordinate of
black and the value
note (x1,y1).
Example:
If use the Osram lamp, then the x0 = 0.281, y = 0.311. The dash line of x0 and y0 is the
target. The solid line of x and y is the measured value.
71