Audio Block Diagram (Vhs) - JVC SR-VS30U Service Manual

4.35

AUDIO BLOCK DIAGRAM (VHS)

0 3 MAIN ( VIDEO/AUDIO, AUDIO I/O, CONNECTION )
TO
TUNER
3
DEMOD(R) IC2601
5
AMP
DEMOD(L)
2 8 SW
FRONT IN
DISP
J7192
CN7191 CN7510
AUDIO(L) IN
F.AUDIO(L)
2
7
7
3
F.AUDIO(R)
8
1 8 NOT
USED
J7193
AUDIO(R) IN
2
3
1
NOT
USED
CN2601
DV_A_PB(R) 2
TO DV MAIN
DV_A_PB(L) 4
(AUDIO AD/DA)
CN3701
DV_A_REC(R) 6
DV_A_REC(L) 8
VHS_DUB(H)
INSEL_B
TO SYSCOM
INSEL_A
OUTSEL_B
OUTSEL_A
0 6 TERMINAL(I/O)
4
R
(R)
3
J910
A2_OUT
6
L
(L)
5
4
R
(R)
3
J907
A1_OUT
6
L
(L)
5
CN901 CN7507
LINE_OUT(R)
R
5
5
4
LINE_OUT(L)
L
4 6
5
(R)
A.IN1(R)
R
3 3
7
A.IN1(L)
J904 L
2
8
A_IN
7
8
(L)
6
1
7
IC2602
R L
12
L
11
13 5 82
1 NOT NA EXT IN
14
USED
15
IC2603
78 TU
NOT
AMP
1
USED
R
7
WF1
4
79 FR
3 3
5
NOT 80 L1
2
USED
9
B
+
77
10
A
R
81
L2
R
L
IC2606
1
WF2
LINE OUT(R)
5
62
R 3
R
2
4
LINE OUT(L)
61
L
12
WF3
14
13
NA REC
L
52
11
10
A
15
9
B
MIX
57
NOT
MIX
USED
64
63
65 LOG (L)
66
NOT LOG(R)
IC2604 USED
11 71
TU
72
15 FR
7
5 13
73 L1
NOT
14
USED
74 L2
L
NOT
12
USED
IC2605
75
AMP
4 +
2
1 3 3
5 NOT
9 B
USED
1
10
A
50
SW
A.MUTE(H)
Q2602
67 DEC(L)
NOT
SW
USED
Q2601
68 DEC(R)
NOT
TRUTH TABLE OF USED
IC2602/IC2604/IC2606
A B ON SWITCH PIN No.
1, 12
LOW LOW
HIGH LOW 5, 14
LOW HIGH 2, 15
HIGH HIGH 4, 11
WF1
IC1-80
R
REC 0.15 Vp-p
L 5 mV/0.5 msec/DIV
IC1
( VIDEO & AUDIO SIGNAL PROCESSOR )
INPUT
SELECT
( R-CH )
NOISE
R
EVR REDUCTION
( R-CH )
R
R
R CH
R
R CH
HIFI
OUTPUT
FM
L CH
SELECT
L
L CH
L
L
NORMAL
NA PB
INPUT
SELECT
NOISE
L
EVR REDUCTION
( L-CH )
DET
INPUT P
SELECT
( L-CH )
R
VCA
HIFI
INPUT
SELECT
HIFI
REC
EQ
WF2 IC1-62 WF3 IC1-52 WF4 IC1-48
REC/PB 0.5 Vp-p REC 0.11 Vp-p PB 1.5 Vp-p
0.1 V/0.2 msec/DIV 2 mV/0.2 msec/DIV 10 mV/0.5 msec/DIV
4-65 4-66
A.MUTE(H)
92
A.MUTE (H)
93
A.FF
60
DA A T
LOGIC 59
CLK
ENV DET
94
REC/PB
+
TP2253
MON
NOR DET
A.PB_FM
Q403-
87
Q405
SW
Q2251
Q401
PRE/REC AMP WF7
Q402
98
CH1
97
COMMON
96
CH2
WF6
POWER
Q2062
SW
Q2061
OSC
SP ON
6
115
TRANS
4
116 FIL TER
-
T2052
+
Q2052-
POWER
PRE AMP
Q2054
SW
+
117 Q2051
REC ON
OSC
118
5
TRANS 6
EP(LP) ON
T2051
119
FIL TER
WF5
48
53
NA IN
WF4
WF5 IC1-119 WF6 IC1-97 WF7
REC 3 Vp-p REC 2.5 Vp-p PB 0.5 Vp-p
50 mV/0.2 msec/DIV
0.1 V/5 msec/DIV 20 mV/0.2 msec/DIV
A.MUTE(H)
A.FF
I2C_DATA_A/V
I2C_CLK_A/V
A.ENV/ND(L)
TO
H.REC_ST(H)
SYSCON
FULL_E_ON(L)
N.REC_ST(H)
N.REC(L)
FLY_ON(H)
FLY_REC(H)
POWER
SW
FL YING
U.DRUM
ERASE HEAD
AMP 12
13 13
FL .E Y
13 14 14
9 9
9
FMA_CH1
10 10
10
11 11
FMA_CH2
11
12 12
A UDIO HEAD
FULL ERASE HEAD
CN2002
1
. F ERASE
2
1 2
A/C HEAD
CN2001 CN1
4 4
A. ERASE
3 5
2 6
REC/PB
1 7
TP2253
A.PB.FM