Hitachi VT-FX685A, Service Manual, Page: 18 / 67

57
48 47
13 14
69
71
6
7
9
R-CH
INSEL
L-CH
INSEL
NOR
SW
SERIAL
DATA
DECODER
OUTPUT
SELECT
VCO LPF
L-CH BPF
R-CH
PNR
PILOT
DET
NOISE
DET
STEREO
PLL
STEREO
FILTER
SAP
FILTER SIF
DEMOD SAP
DEMOD
L-R
DEMOD
ST/SAP
SW
MATRIX
L-CH
PNR
LIM DEV
COMP
SW
NOISE
VCO LPF
LIM DEV
COMP
COMP
DC
SW
NOISE
dBX
DEC
ENV
DET
MODE
OUT
RIPPLE
FILTER
BO
DET
MATRIX
R-CH BPF
P
R
R
L
P
R
HOLD
PULSE
NOISE
DET
ALC
31 30
23
4
80
2
78
37
38
39
54
77
1
40
26
24
27
SIF
A-IN(R)
A-IN(L)
N-A-OUT
A-IN(R)-F
A-IN(L)-F
TO
AUDIO BLOCK
AGC
AGC
DET
49
MUTE
A-OUT (L)
MOD-A
A-OUT (R)
N-A-IN
Hi-Fi-H-SW
A-MUTE-H
NORMAL-H
51
ST/SAP-MODE
TO AUDIO BLOCK
Hi-Fi-DATA
Hi-Fi-CLK
Hi-Fi-CS
P-ON+9V
TO SERVO/ SYSTEM
CONTROL BLOCK
TO SERVO/SYSTEM
CONTROL BLOCK
TO SERVO/SYSTEM
CONTROL BLOCK
Hi-Fi
AUDIO
(R) HEAD
Hi-Fi
AUDIO
(L) HEAD
CYLINDER
ASSEMBLY
MAIN CBA
Hi-Fi- A(R) 7
Hi-Fi -COM 8
Hi-Fi- A(L) 9
CN251
IC451 (MTS/ SAP/ Hi-Fi AUDIO PROCESS/ Hi-Fi HEAD AMP)
Hi-Fi Audio Block Diagram
1-8-7 1-8-8
REC-AUDIO SIGNAL PB-AUDIO SIGNAL Mode : SP/REC
PILOT
CANCEL