6 5
D.TROUBLE SHOOTING OF PAL COLOUR IN THE RECORD MODE.
E.TROUBLE SHOOTING OF SECAM COLOUR IN THE RECORD MODE.
IS THE VIDEO SIGNAL FROM PIN
35 OF IY01 ?
CHECK PCB PATTERN AND
ADJACENT CIRCUIT.
IS ON/OFF 5V SUPPLIED TO PIN 36
AND PIN 47 OF IY01 AT 5 VOLTS ?
CHECK ON/OFF 5V
IS THE DOWN-CONVERTED COLOUR
SIGNAL OBTAINED FROM PIN 14 OF
IY01 ?
CHECK IY01.
IS THE DOWN-CONVERTED COLOUR
SIGNAL FROM PIN 14 OF IY01 FED
TO PIN 7 OF IY04 THROUGH BUFFER
QCY08, QCY11 ?
CHECK QCY08, QCY11
AND ADJACENT CIRCUIT.
TO PREAMP CIRCUIT.
NG
NG
NG
NG
OK
OK
OK
OK
IS THE VIDEO SIGNAL FROM PIN
35 OF IY01 ?
CHECK PCB PATTERN AND
ADJACENT CIRCUIT.
IS ON/OFF 5V SUPPLIED TO PIN 5
AND PIN 17 OF IY03 AT 5 VOLTS ?
CHECK ON/OFF 5V
IS THE SIGNAL FROM PIN 24 OF
IY03 FED TO PIN 12 OF IY03 AND
12dB AMP CIRCUIT ?
CHECK IY03 AND 12dB AMP
CIRCUIT.
IS THE SIGNAL FROM COLLECTOR
OF QCL07 FED TO PIN 10 OF IY04 ?
CHECK QCL05, QCL07, CCL17,
RCL12
TO PREAMP
CIRCUIT.
NG
NG
NG
NG
OK
OK
OK
OK
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 ...