Sharp LC-20SH3H, Service Manual

Page: 20 / 67

LC-20SH3H/M/X
LC-20SH4H/M/X
20
6-3. White balance adjustment
1) Adjustment procedure
Adjust the RGB CUTOFF2 setting for white 40% first and then the RGB-GAIN setting for white 80%.
(1) Adjusting the test signal
[Input signal] White 80% (191 gradations) for the left of screen, and white 40% (92 gradations) for the right.
[Specification] RGB CUTOFF2 and RGB-GAIN settings on Adjustment Process Page 3.
Adjustment spec.
Inspection spec.
White 80% x 0.264 0.004 0.01 Radius from the center
y 0.273 0.004 0.01 Radius from the center
White 40% x 0.274 0.002 0.01 Radius from the center
y 0.279 0.002 0.01 Radius from the center
[Adjusting with the bus]
Gain (RGB-GAIN): Fix the G setting at "0". Vary the R and B settings accordingly. Adjustment range: ±40
Cut-off (RGB CUTOFF2): Reduce the two strong colours
Adjustment range: Down to -40
(Reading with Minolta CA-210)
[7] Factory settings
7-1. Making factory settings
Use the adjustment remote controller for the factory settings.
1) Hold down the remote controller's FACTORY SETTING key.
2) Several seconds later, "SETTING COMPLETE" appears at the center of the screen.
Now the settings are complete.
~
1 :H (LC-20SH3H/SH4H)
:M (LC-20SH3M/SH4M)
:X (LC-20SH3X/SH4X)
SETTING COMPLETE
~
1