7
4. ALIGNMENT INSTRUCTIONS
4-1. MAIN TUNER AFT
1. STANDARD B/G
1 ) S e t a s ig n a l g e n e ra to r w ith
- R F F R E Q U E N C Y = 3 8 .9 M H z
- R F O U T P U T L E V E L = 80
5 d B u V
2 ) C o n n e ct th e s ig n a l g e n e ra to r R F o u tp u t to T P 1 ( T U N E R IF O U T P U T )
T h e re m u s t be n o s ig n a l inp u t to th e T U N E R .
3 ) P re ss th e "V C O " K E Y a n d w a it u n til th e T V s c re e n disp la y "A FT O K "
4-2. SUB TUNER AFT
1. STANDARD B/G
1 ) S e t a s ig n a l g e n e ra to r w ith
- R F F R E Q U E N C Y = 3 8 .9 M H z
- R F O U T P U T L E V E L = 80
5 d B uV
2 ) C o n n e ct th e s ig n a l g e n e ra to r R F o u tp u t to T P 2 ( T U N E R IF O U T P U T )
3 ) C o n n e ct th e D C v o lta g e m e te r to T P 3 .
4 ) A d ju s t L 2 0 1 ( A FT C O IL ) fo r 2 .2 V
0 .1 V.
4-3. MAIN TUNER AGC
1 ) S e t a P a ttern G e n era to r w ith R F le v e l 6 0
2 d B u V, 2 1 0 .2 5 M H z .
2 ) C o n n e ct a O S C IL L O S C O P E P R O B E to P 1 0 1 ( T U N E R A G C IN P U T ).
3 ) A d ju s t A G C U P /D O W N K E Y the vo lta g e d ro p a b o u t 1 .8 V D C o v e r b e lo w it's m a x im u m v olta g e .
4-4. SUB TUNER AGC
1 ) S e t a P a ttern G e n era to r w ith R F le v e l 6 0
2 d B u V, 2 1 0 .2 5 M H z.
2 ) C o n n e ct a O S C IL L O S C O P E P R O B E to P 1 0 1 ( T U N E R A G C IN P U T ).
3 ) P re ss th e "S U B A G C " K E Y a n d m o n itorin g th e S U B T U N E R P IC T U R E .
4 ) A d ju s t R 2 0 2 ( S U B A G C V R ) th e vo lta g e d ro p a b o u t 1 .8 V D C o ve r b elo w it's m a xim u m vo lta g e .
4-5. SCREEN
1 ) A p p ly a C O L O R B A R PAT T E R N S IG N A L .
2 ) P re ss th e "S C R E E N " K E Y .
3 ) C o n n e ct a O S C IL L O S C O P E P R O B E to P 9 0 6 ( C R T C AT H O D E R ,G ,B )
4 ) A d ju s t th e s cre e n v o lu m e o n F B T su c h th at th e h ig h e s t b la ck lev e l vo lta g e 1 3 0
5 V dc .
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 ...
