6 2
10-9. VCR VIDEO CIRCUIT
A. TROUBLE SHOOTING OF PREAMP IN THE PLAYBACK MODE.
IS THE SIGNAL FROM HEADS
FED TO PIN1 AND PIN3 (LP MODE)
OR PIN 5 AND PIN 7 (SP MODE) OF
PAY01.
CHECK DRUM AND
DECK MECHANISM.
IS ON/OFF 5V FROM PIN 76 OF
IY01 SUPPLIED TO PIN 13 OF IY04
AT 5VOLTS ?
CHECK ON/OFF 5V
IS REC (H) FROM PIN 19 OF
IY01 SUPPLIED TO PIN 11 OF
IY04 AT ZERO VOLTS ?
CHECK REC (H)
IS H.AMP SW FROM PIN 16 OF
IN01 SUPPLIED TO PIN 3 OF
IY04 ?
CHECK H.AMP SW
IS VIDEO SW FROM PIN 18 OF
IN01 SUPPLIED TO PIN 4 OF
IY04 ?
CHECK VIDEO SW
IS TRICK(H) FROM PIN 21 OF
IY01 SUPPLIED TO DN07 AT
ZERO VOLT ?‘
CHECK TRICK (H)
IS THE SIGNAL FROM PIN1 AND
PIN3 (LP MODE) OR PIN5 AND
PIN7 (SP MODE) OF PAY01 FED
CHANGE IY04
IS THE SIGNAL FROM PIN7 OF
IY04 FED TO C354 ?
CHECK PB EQ
CHECK VIDEO CIRCUIT
REC(H) : "HIGH" IN THE RECORD MODE
"LOW" IN THE EE AND PB MODE
H.A SW : "HIGH" IN THE LP MODE
"LOW" IN THE SP MODE
TRICK(H) : "HIGH" IN THE TRICK PLAY
OK
OK
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
NG
NG
NG
IY04 : LA70001
Содержание MV1421
Страница 1: ...SERVICE MANUAL MV1421 1422 4822 34cm 48cm Televideo Effective December 1999 MV4822SERV ...
Страница 6: ...4 3 BLOCK DIAGRAM 3 1 Audio Signal Flow ...
Страница 7: ...5 3 2 Video Signal Flow ...
Страница 8: ...6 3 3 TV and monitor power switching ...
Страница 22: ...20 3 Block Diagram ...
Страница 53: ......
Страница 54: ......
Страница 55: ......
Страница 117: ...2 Main PCB Assy Circuit Diagram SECTION BEFORE AFTER MAIN TUNER ...
Страница 118: ...3 SECTION BEFORE AFTER SUB TUNER ...
Страница 125: ...10 Exploded View MV1421 model ...
Страница 126: ...11 Exploded View MV1422 model ...
Страница 127: ...12 Exploded View MV4822 model ...
Страница 128: ...13 Exploded View DVT 20F9 model ...
Страница 129: ...14 Exploded View DVT 21F1 model ...
Страница 130: ...15 Exploded View DVT 21F2 model ...