Sharp VL-C780S Serviceanleitung Seite 197

Nhen the following are set,
B-Y/H_ pin (23) potential
B-Y/L pin (21) potential
R-Y/H_ pin (5) potential
R-Y/L_ pin (7) potential
he shaded portion shown in Fig. 6-2 (f) is set as a detection area set by means of the internal logic. This
irea is in accordance with the colour temperature colour change characteristics, by which white balancew
orrection is performed.
1C301
'he colour difference of the extracted colour temperature colour component is averaged by detection
apacitors C305 and C311 of pin (20) (B-Y) and pin (8) (R-Y) and compared with the white balance start
etting potential pin (25) and pin (27). If it is lower than the white balance start setting potential, white
valance correction action is not performed. This is for preventing the fading caused when an object with
ow chroma is imaged in the colour temperature detection area and white balance correction is performed.
'he white balance lock raises the start setting potential pin (25) and pin (27) to "H" by means of Q301. As
he colour difference average of the colour temperature and colour component dose not exceed the start
etting potential, white balance correction is not performed. : "
5 addition to the colour temperature detection area shown in Fig. 6-2 (f), the fluorescence detection area 4
hown in Fig. 6-2 (g) is provided. If fluorescence is image after keeping white balance in daylight, it looks
ellowish. As this is not covered by the area shown in Fig. 6-2 (f), the fluorescence detection area is
irovided.
1 this area, R-Y is set to the internal fixation; B-Y is set to the Vre¢ + F.SET by means of pin (26) potential.
Lots 3
— ie
R-Y/H © pin
Figure 6-2 (f). Colour Temperature Colour Detection Area
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yp S