Video Block Diagram(Vhs) - JVC HM-HDS1EK Service Manual

4.37 VIDEO BLOCK DIAGRAM (VHS)
5
1 5 S-SUB
4
C
C
Y
42
PRE LPF
43
3 Y
CLAMP
PRE LPF
45
PRE LPF
47
C
PRE LPF
48
C
49
50
NOT
USED
51
ATT
CLAMP
2
52
53
Y
REC
54
AGC
PB
AGC DET
S.SEP
56
Y
ATT
IC501
( Y/C SWITCH )
1
1
Note : For the waveforms in this block diagram , refer to page 4-63.
A B
Y
Y
C
+ NOT
USED
41 40 39 38 36 34 33 32 31 30 29
EE/PB SP/EP(LP)
CR VHS
CLK DATA CLAMP
ADJ S-VHS
IIC LOGIC
CONV
PB DIGI/PB REC
PB
REC PB
REC CONV
ATT DIGI REC
PB*CONV N/S-LPF
CLAMP
DIGI/PB
EQ
EXT PB Y PB REC
DIGI
CLAMP
CONV
CONV
C
VCA
REC
PB*CONV
EXT PB C
PB
REC
EXT PB C
N.C.
ATT CLAMP
REC PB
C
TRAP
C
Y
Y
V FBC V MUTE
BB
PB*D15
C.K.
D7&D8
GCL BB BIAS
BB
V5
COMP IN
V4
BB
C MUTE
V3/V4
Y/C IN
V3
C1 C3 D16
C2 Y FBC
L
Y MUTE
S1/S2 DET
Y1 Y3
Y2
ATT ATT ATT ATT
2 3 4 5 6 7 8 9 10 11 12 14
NOT
USED
C
( Y/C SEP & MIX )
IC1401
7
DFFI
8
VR
11
SDATA
12
SCLK
REC
COUT 17
PS com/CNR
PB
REC
19
3L COMB YOUT
Y COMB
PB
REC PB
31 29 24
Q1418,Q1420
Q1417
BPF BUF
Y
IC502
( S-VHS & SVHS-ET SWITCH )
28 1 18
EQ
SP
27
2 17
SP
EE(L)
EQ
16
REC PB
25
5 12
NON LINEAR
PROCESSOR
24
NOT
USED
PB
6 11
23 EQ
SP
FILTER FILTER
REC
10
SP
EQ
21
Y
20
19
18
NOT
USED
17
C
15
Y
D E
4-73 4-74
0 5 3D DIGITAL/2M
BPF BUF
Q1402
CN1401
BUF
LPF
15
Q1406
14
12
11
C
9
Q1404
Y
Q1408 Q1414
7
SW 6
Y Y
BUF 5
C
3
1
WF1 WF3
WF2
CN511
1
2
3
4
C
9
Y
10
Y
11
C
12
C
13
14
16
Y
17
18
20
21
22
23
25
26
Y
27
Y
29
C
30
WF9 WF8 WF6
WF7
WF10
WF13 WF11
WF14 WF12
CN512
2
4
6
C
8
Y
10
C
12
Y
14
F
D.FF
1
V.REF
2
I2C DATA A/V
3
I2C CLK A/V
4
C FROM DIGI
5
Y FROM DIGI
6
EE(L)
7
Y/V TO DIGI
8
C TO DIGI
9
Fsc
10
WF4
EE(L)
11
I2C DATA A/V
12
I2C CLK A/V
13
Fsc
14
C TO DIGI
15
Y/V TO DIGI
16
Y FROM DIGI
17
C FROM DIGI
18
PB COLOR
19
V.PULSE
20
MAIN ALC DET
21
Y TO SUB
22
P.MUTE(L)
23
FRONT Y IN
24
FRONT C IN
25
FRONT V IN
26
REAR2 V IN
27
V TO OSD
28
CHARA DATA
29
Y TO AV
30
V FROM AV
31
REC COLOR
32
WF5
V FROM OSD
33
C OUT
34
Y OUT
35
REAR2 C IN
36
REAR2 Y IN
37
REAR1 C IN
38
REAR1 Y IN
39
G H