6 3
B. TROUBLE SHOOTING OF PREAMP IN THE RECORD MODE.
IS THE Y-FM SIGNAL FROM PIN
18 OF IY01 FED TO PIN9 OF IY04 ?
CHECK RY48, CCY05
AND PCB PATTERN.
IS THE DOWN CONVERTED COLOUR
SIGNAL FROM PIN 14 OF IY01 FED
TO PIN 10 OF IY04 ?
CHECK CCY04 AND
PCB PATTERN.
IS ON/OFF 5V SUPPLIED TO PIN
13 OF IY04 AT 5 VOLTS ?
CHECK ON/OFF 5V
IS REC(H) SUPPLIED TO PIN 11 OF
IY04 AT 5 VOLTS ?
CHECK REC (H)
IS TRICK (H) SUPPLIED TO PIN 1
OF IY04 AT ZERO VOLTS ?
CHECK TRICK (H)
IS THE SIGNAL FROM PIN9 AND PIN
10 FED TO PIN 22 (SP MODE) AND
PIN17 (LP MODE) OF IY04 ?
CHECK IY04.
CHANGE DRUM
NG
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
OK
IY04 : LA70001
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 ...