ELECTRICAL TROUBLESHOOTING GUIDE -11/17 3. Y/C CIRCUIT (3) When the C(Color) signal doesn�t appear on the screen in PB Mode,
Is 5.2VT/5.4VA applied to the IC301 Pins 24, 42, 55, 72, 91. YES Is the Color Rotary signal applied to the IC301 Pin 70? YES Is Color Rotary "H" about 3.4V? YES Does the Color signal appear at the IC301 Pin 25 ? NO Does the X301(4.43MHZ) oscillate? NO Replace the X301. NO Check the Color Rotary level. (Check the R303) NO Check the Color Rotary Circuit. (IC501 pin 99 ) NO Check the line of the 5.2VT/ 5.4VA Line. (Power Circuit)
YES
Does the Color signal appear at the IC301 Pin 21? YES
