6 4
C. TROUBLE SHOOTING OF LUMINANCE SIGNAL IN THE RECORD MODE.
IS THE VIDEO SIGNAL FROM PIN
24 OF IY01 ?
IS ON/OFF 5V SUPPLIED TO PIN 36
AND PIN 47 OF IY01 AT 5 VOLTS ?
IS THE LUMINANCE SIGNAL FROM
PIN 25 OF IY01 FED TO PIN 26 OF
IY01 ?
IS THE LUMINANCE SIGNAL FROM
PIN 26 OF IY01 FED TO PIN 18 OF
IY01 ?
IS THE MODULATING LUMINANCE
SIGNAL FROM PIN 18 OF IY01 FED
TO PIN 9 OF IY04 ?IY01 ?
TO PREAMP CIRCUIT
CHECK PCB PATTERN
AND ADJACENT CIRCUIT.
CHECK ON/OFF 5V
CHECK QCY03, RCY02,
RCY39, CCY46, CCY70.
IS TRICK (H) SUPPLIED TO
ANODE OF DN07 AT 0 VOLT ?
CHECK IY01
CHECK TRICK (H)
CHECK RY48, CCY05
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
NG
Summary of Contents for MV1421
Page 1: ...SERVICE MANUAL MV1421 1422 4822 34cm 48cm Televideo Effective December 1999 MV4822SERV ...
Page 6: ...4 3 BLOCK DIAGRAM 3 1 Audio Signal Flow ...
Page 7: ...5 3 2 Video Signal Flow ...
Page 8: ...6 3 3 TV and monitor power switching ...
Page 22: ...20 3 Block Diagram ...
Page 53: ......
Page 54: ......
Page 55: ......
Page 117: ...2 Main PCB Assy Circuit Diagram SECTION BEFORE AFTER MAIN TUNER ...
Page 118: ...3 SECTION BEFORE AFTER SUB TUNER ...
Page 125: ...10 Exploded View MV1421 model ...
Page 126: ...11 Exploded View MV1422 model ...
Page 127: ...12 Exploded View MV4822 model ...
Page 128: ...13 Exploded View DVT 20F9 model ...
Page 129: ...14 Exploded View DVT 21F1 model ...
Page 130: ...15 Exploded View DVT 21F2 model ...