35
6-12. LA70001 ( HEAD AMP IC )
1. Feature
A G C c ircu it is b u ilt-in th is IC ( n o re c ord cu rre nt a d ju s tm e n t is req u ire d )
P la yb a c k e n v elo pe d e te c to r c ircu it is b u ilt-in th is IC fo r th e p u rp o se o f a u to -tra ck in g .
O p e ra tin g su p p ly v o lta ge : 4 .8 V - 5 .5 V
2. Pin Description
3. Block Diagram
P IN N O .
P IN N A M E
S TA N D A R D D C
V O LTA G E
P IN N O .
P IN N A M E
S TA N D A R D D C
V O LTA G E
1
N C
13
VC C
5V
2
N C
14
R EC C U R R EN T
AD J.1
P B : 5.0V R EC : 4.5V
3
H A (EP/SP)
1.5V TH R ESH O LD
15
R EC .AG C FIL.
P B : 0V R EC : 1.6V
4
SW 30
1.0V TH R ESH O LD
16
L IN
P B : 2.1V R EC : 4.1V
5
H -SYN C
1.5V TH R ESH O LD
17
R EC SP O U T
P B : 2.1V R EC : 4.1V
6
EN VELO PE
D ET O U T
P B : R EC : 0V
18
PB FILTER
P B : 0V R EC : 2.5V
7
PB O U T
P B : 1.7V R EC : 2.1V
19
H IN
P B : 0V R EC : 4.1V
8
G N D
20
G N D
0V
9
R EC Y IN
P B : 4.0V R EC : 3.7V
21
N C
10
R EC C IN
P B : 4.0V R EC : 3.7V
22
N C
11
R EC /M U TE/PB
23
N C
12
R EC C U R R EN T
AD J.2
P B : 2.5V R EC : 2.5V
24
N C
H -C H
L -C H
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 ...