6 8
H. TROUBLE SHOOTING OF SECAM COLOUR IN THE PLAYBACK MODE.
IS THE SIGNAL FROM PIN 7 OF
IY04 FED TO PIN 15 OF IY01 ?
CHECK PREAMP CIRCUIT
IS THE SIGNAL FROM PIN 7 OF
IY04 FED TO PIN 21 OF IY01 THROUGH
PB AMP AND 1.1MHz BPF ?
CHECK PB AMP CIRCUIT
AND IY03
IS ON/OFF 5V SUPPLIED TO PIN 5
AND PIN 17 OF IY01 ?
CHECK ON/OFF 5V
IS SECAM COLOUR SIGNAL FROM
PIN 21 FED TO PIN 12 OF IY01
THROUGH
PIN 14 AND 12dB AMP CIRCUIT ?
CHECK 12dB AMP CIRCUIT.
IS C.SYNC ( COMPOSITIVE SYNC )
SUPPLIED TO PIN 9 OF IY03 ?
CHECK C.SYNC
IS THE SIGNAL FROM PIN 12 FED
TO PIN 15 OF IY03 ?
CHECK IY03.
IS THE SIGNAL FROM PIN 15 OF
IY03 FED TO PIN 46 OF IY01 ?
CHECK CCL17,QCL05,RCL12
AND SECAM (H)
TO TV PART.
THE 12dB AMP CIRCUIT CONSIST OF
QCL07,RCL33,RCL34,RCL36,CCL35
OK
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
NG
NG
THE AMP CIRCUIT CONSIST OF
QCY08, QCY11 AND ADJACENT CIRCUIT.
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 ...