Acer AT4202P, Service Manual

Page: 35 / 99

Page 35 of 99
5
、
White-Balance Adjustment
5-1 Equipments list
Chroma7100 1set
VG828 video signal generator 1set
Chroma-2326 1set
5-2 Preparation and Adjustment process
1
、
Preparation:
z Connect rear Video port of PDP with AV port of VG-828.
z
Connect component port of PDP with YPbPr port of VG-828
z Connect VGA port of PDP with corresponding port of Chrom2326
z Turn power of PDP and test instrument on.
z Before open lens, Press O-CAL of Chrom-7100 and revise lens.
2 、 Adjustment process
DVI Mode
1.1 Set Pattern generator to 640X480(60) DVI output and 70% white screen pattern.
1.2 Set OSD picture standard value.
1.3 Used remote control to entry factory mode, adjust Red gain, Green gain, Blue gain value in “white
balance page” and make Chroma 7100 x, y value into color temperature spec and Y value to
maximum. ( Standard: x = 295 ± 10, y = 305 ± 10 )
1.4 Set Pattern generator to 640X480(60) DVI output and 32 Gray scale pattern.
1.5 Used remote control to entry factory mode, adjust Green offset value and Green gain value in
“white balance page” to make 32 gray scale pattern can be distinguished 28 gray scale at least,
and the most darkness level is totally dark, and make sure the most brightness two level can be
distinguished
1.6 Set Pattern generator to 640X480(60) DVI output and 20% white screen pattern.
1.7 Used remote control to entry factory mode, adjust Red offset, Blue offset value in “white
balance page” and make Chroma 7100 x, y value into color temperature spec (Standard: x = 295
± 10, y = 305 ± 10)
1.8 Repeat step 1.3 to 1.7 until 70% & 20% white screen pattern x, y value in spec.
RGB Mode:
1.1 Set Pattern generator to 640X480(60) VGA output and 70% white screen pattern.
1.2 Set OSD picture standard value.
1.3 Used remote control to entry factory mode, adjust Red gain, Green gain, Blue gain value in “white