Image color saturation is determined by the chromaticity bandpass amplifier gain, and chroma bandpass amplifier gain control circuit under automatic saturation ACC and hand. Actuator saturation control. When the two parts circuit is out of order, there will be a color through thick or too weak fault. The ACC control circuit fault at the same time will cause saturation along with the change of signal strength that ACC is out of control. Repair method is as follows: Nyrservice manual download site
(1) measuring saturation control potentiometer R509 normal, electricity measurement IC501 20 feet voltage variation range of 0.8 ~ 7.8 V, is normal. Nyrservice manual download site
(2) measuring IC501 foot end voltage of 10.5 V, normal about 8.9 V, on the high side. Check 16 feet external Acc filter circuit R503 and C504, found C504 leakage, C504 leakage after that has made the Acc control voltage increases, and chroma increases, the chroma channel gain also cannot drop down, so the color too thick. Because of the filter capacitor leakage, the control voltage can't keep up with chroma signal amplitude change, hence, color saturation unstable failure. Nyrservice manual download site
Replace the C504, 1 mu fault elimination after 50 v/F.Nyrservice manual download site