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

4.34 VIDEO BLOCK DIAGRAM (VHS)
0 6 TERMINAL(S-SUB, I/O)
C
+
42 41 40 39
CR
CLK
ADJ
IIC LOGIC
PRE LPF
43
CLAMP
PRE LPF ATT
DIGI/PB
EXT PB Y
45
PRE LPF
47
C C
PRE LPF
48 EXT PB C
C
EXT PB C
49
50
NOT
USED
51
ATT
CLAMP
52
53
GCL
V5
COMP IN
REC
54
Y
AGC
V3/V4
Y/C IN
PB
AGC DET
56 S.SEP
Y
Y
Y1
ATT
IC501
( Y/C SWITCH )
1 2 3 4
NOT
USED
Y
C
C
Y
C
Y
Y
NOT NOT
USED USED
38 36 34 33 32 31 30 29
EE/PB SP/EP(LP)
VHS
DATA CLAMP
S-VHS
CONV
PB DIGI/PB REC 28
PB
PB
REC REC CONV
DIGI
REC
27
PB*CONV N/S-LPF
CLAMP
EQ
PB REC
Y
DIGI
25
NOT
CLAMP
USED
CONV
CONV 24
VCA
REC
PB*CONV
23
FILTER FILTER
PB
REC
N.C. 21
ATT CLAMP
REC PB
TRAP
20
19
V FBC V MUTE
BB
PB*D15
C.K.
D7&D8 18
NOT
BB BIAS
BB
USED
V4
17
BB
C MUTE
V3
C1 C3 D16
C2 Y FBC
15
Y MUTE
S1/S2 DET
Y3
Y2
ATT ATT ATT ATT
5 6 7 8 9 10 11 12 14
NOT NOT NOT
USED USED USED
( Y/C SEP & MIX )
IC1401
0 5 3D/TBC(2M)
7
DFFI
8
VR
11
Q1419
ES
SDATA
12
REC
SCLK
17
BPF BUF
PS com/CNR COUT
Q1402
PB
REC
19
3L COMB YOUT
LPF BUF
Y COMB
PB Q1406
REC PB
21 VR1401
VREF
D/A LEVEL ADJ.
31 29 24
Q1418
LPF BUF
Q1417
C
BPF BUF
Y
Y
Y
Y
C
Y
Y
Y
C
C
Y
8
2
IC901
C
4-61 4-62
CN1401
D.FF
15 1
V.REF
14 2
I2C_DATA_A/V
12 3
I2C_CLK_A/V
11 4
C C_FROM_DIGI
5
9
Y_FROM_DIGI
Y
7 6
EE(L)
6 7
V/Y_TO_DIGI
Y
8
5
C_TO_DIGI
3 9
Fsc
1 10
CN504
EE(L)
2 11
I2C_DATA_A/V
7 12
I2C_CLK_A/V
8 13
V_FROM_AV
1 14
REC_COLOR
C
3 15
Fsc
16
10
CN505
Y_TO_AV
Y
12 17
V_FROM_OSD
18
4
V_TO_OSD
1 19
CHARA_DATA2
2 20
Y_TO_S.E
10 21
Y_FROM_S.E
8 22
CN506
C PB_COLOR
1 23
MAIN_ALC_DET
4 24
Y Y_TO_SUB
5 25
P.MUTE(L)
26
6
FRONT_V_IN
7 27
FRONT_Y_IN
2 28
C_OUT
C
11 29
Y_OUT
9 30
CN502
C_TO_DIGI
C
6 31
Y/V_TO_DIGI
8 32
Y_FROM_DIGI
33
10
C C_FROM_DIGI
12 34
D_DUB_C_IN
2 35
D_DUB_Y_IN
4 36
TO_PS_C
C
14 37
TO_PS_Y
15 38
1
3
J901
Y
4
S_IN
C
2
2
J904
V_IN
1
1
3
J902
Y
4
S1_OUT
C
2
1
Y
3
J903
Y
C 4
C S2_OUT
2
6 7
2
J907
1 V1_OUT
2
J910
V2_OUT
1
CN503
4 3
R_V_OUT
1 39
Y S_Y_OUT
40
3
C S_C_OUT
5 41
FRONT_C_IN
7 42
C.BOX/SAT_CTL
9 43
2
J913
3
C.BOX
1
ONLY USED FOR HR-DVS3U/SR-VS30U