Sharp VL-C780S Serviceanleitung Seite 196

VL-C780S/H/X
VL-C7400E
VL-C&90S/H/X
VL-C6A00E
3200°K : Cae Outdoor (5000°K)
© pin
R-Y
-
|— =
——
R-Y
R-Y
©
B-Y B-Y
a
® pin
B-Y =
(d) {c}
1C103
SIGNAL
PROCESSING
1C204
ENCODER
1c401 C651, IC652
D/A
CONVERTER
COLOUR
DIFFERENCE
SIGNAL
W/B
CONTROL
ADJUSTING
DATA IC653
IC655
MICRO-
COMPUTER
WHITE BALANCE
1€301
Figure 6-2 (e). System Block Diagram
1. Colour temperature detection
The signal processing white balance detects the colour temperature with the colour difference signal and
performs white balance correction. The colour difference signal having experienced carrier balance at
encoder 1C401 is at-tenuated at R322, R323, R325 and R326, sent to pin (24) and pin (4) of IC301 through the
buffer of Q302, and then subject to clamping combinationat capacitors C303 and C309.
After being clamped to 1/2 Vee in 1C301, the colour difference signal part in the colour temperature
detection area shown in Fig. 6-2 (f) is extracted.
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