Color Enhancer Control Circuit - Sanyo AVM-2550S Training Manual

Model AVM-2780G provides for a Color Enhancer function.
Enhancer function is selected by using the on-screen menu. The Color
Enhancer circuits perform color temperature selection. The color temperature
is controlled by the BUS control signals from the CPU IC801 to the Signal
Processor IC101.
When the Color Enhancer mode is "Normal", the CPU will output the BUS
control data to IC101 for the normal picture.
When the color Enhancer mode is "Warm", the CPU will change the BUS data
for the R-Drive Control Registers to decrease the color temperature of the
screen by adding 8 steps (8/127) of the BUS data for the R-Drive Control
IC801
CPU
L813
BUS
32
SDA
L814
BUS
34
SCL

COLOR ENHANCER CONTROL CIRCUIT

The Color
IC101
SIGNAL PROCESSOR
R803
DATA
44
BUS
Interface
R804
43
CLK
+ 8 steps to R-Drive
– 8 steps from B Drive
R-Drive
Write
28
7 bit
RGB
29
B-Drive
OUT
Write
30
7 bit
Register and subtracting 8 steps (8/127) or the BUS data for the B-Drive
Control Register. However, if the result in the addition or the subtraction of
the BUS data for the R-Drive or B-Drive control was out of the range of the
Control Register, the data is limited to 0 step(0/127) or 127step (127/127).
When the Color Enhancer mode is "Warm" and during the larger amplitude of
white signal in brighter scenes, the white balance will become reddish. This
operation is accomplished by decreasing the amplitude, white simultaneously
increasing the R amplitude to change the white balance in bright scenes to
reddish.
210V
KB K7B
4 4
210V
3 3
2 2 9V
9V
1 1
KS K7S
R287
R R
1 1
R288
G G
2 2
R289
B B
3 3
4 4
5 5
MAIN BOARD CRT DRIVER BOARD
Color Enhancer Control Circuit
– 62 –
R717
Heater R727
R724
Q721
R-OUT
R722
C721
R721
R723
R714
Q711
G-OUT
R712
C711
R711
R713
R704
Q701
B-OUT
R702
C701
R701
R703
R707