C. TROUBLE SHOOTING OF LUMINANCE SIGNAL IN THE RECORD MODE.
NG
IS THE VIDEO SIGNAL FROM PINCHECK PCB PATTERN
24 OF IY01 ? AND ADJACENT CIRCUIT.
OK
IS ON/OFF 5V SUPPLIED TO PIN 36NG
CHECK ON/OFF 5V
AND PIN 47 OF IY01 AT 5 VOLTS ?
OK
IS THE LUMINANCE SIGNAL FROM
NG
PIN 25 OF IY01 FED TO PIN 26 OFCHECK QCY03, RCY02,
RCY39, CCY46, CCY70.
IY01 ?
OK
IS THE LUMINANCE SIGNAL FROM
NGIS TRICK (H) SUPPLIED TO
PIN 26 OF IY01 FED TO PIN 18 OF
ANODE OF DN07 AT 0 VOLT ?
IY01 ?
OKNG
CHECK IY01CHECK TRICK (H)
OK
IS THE MODULATING LUMINANCE
NG
SIGNAL FROM PIN 18 OF IY01 FED CHECK RY48, CCY05
TO PIN 9 OF IY04 ?IY01 ?
OK
TO PREAMP CIRCUIT
64 |