Philips 20MC4304, Service Manual

Page: 18 / 316

1-4-4
Hi-Fi Audio Block Diagram
TD901BLH
57
7
48
47
13
14
69
6 7
R-CH INSEL L-CH INSEL
NOR SW
SERIAL DATA DECODER
OUTPUT SELECT
VCO
LPF
L-CH BPF
R-CH PNR
PILOT DET
CONT
STEREO PLL
STEREO FILTER SAP FILTER
SAP DET
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
DO DET
MATRIX
R-CH BPF
P R
R L
P R
HOLD PULSE NOISE DET
34
33
23
4
80 78 37 38 54 77
1
39 26 24 27
N-A-OUT
LIM
49
A-OUT (L)
A-OUT (R)
N-A-IN
Hi-Fi-H-SW
A-MUTE
NORMAL-H
40
ST/SAP-MODE
TO AUDIO BLOCK
SCL
P-ON+9V
TO SERVO/SYSTEM CONTROL BLOCK
Hi-Fi AUDIO (R) HEAD Hi-Fi AUDIO (L) HEAD
CYLINDER ASSEMBLY
MAIN CBA
Hi-Fi-
A(R)
3
Hi-Fi
-COM
2
Hi-Fi-
A(L)
1
CL1401
IC1751
(MTS/ SAP/ Hi-Fi AUDIO PROCESS/ Hi-Fi HEAD AMP)
REC-AUDIO SIGNAL
PB-AUDIO SIGNAL
PILOT CANCEL
TO AUDIO BLOCK
TO SERVO/ SYSTEM CONTROL BLOCK TO SERVO/SYSTEM CONTROL BLOCK
62
63
JK1702 A
UDIO-IN(L)
JK1703 A
UDIO-IN(R)
B
U
FFER
Q1010
SIF
TU1001
(TUNER UNIT)
Q1701
TP1701
TP1702
SDA
Hi-Fi-L
Hi-Fi-R
NO
TE FOR
WIRE CONNECT
ORS:
1.
PREFIX SYMBOL "CN" MEANS CONNECT
OR.
(CAN DISCONNECT AND RECONNECT
.)
2.
PREFIX SYMBOL "CL" MEANS
WIRE-SOLDER
HOLES OF
THE PCB
.
(WIRE IS SOLDERED DIRECTL
Y
.)
TEST POINT INFORMA
TION
:INDICA
TES A
TEST POINT
WITH A JUMPER
WIRE A
C
R
OSS A HOLE IN
THE PCB
.
:USED
T
O
INDICA
TE A
TEST POINT
WITH A COMPONENT LEAD ON FOIL SIDE.
:USED
T
O
INDICA
TE A
TEST POINT
WITH NO
TEST PIN.
:USED
T
O
INDICA
TE A
TEST POINT
WITH A
TEST PIN.