Magnavox 19MDTR20 Service Manual page 24

Hi-Fi Audio Block Diagram
TEST POINT INFORMATION
:INDICATES A TEST POINT WITH A JUMPER WIRE ACROSS A HOLE IN THE PCB.
:USED TO INDICATE A TEST POINT WITH A COMPONENT LEAD ON FOIL SIDE.
:USED TO INDICATE A TEST POINT WITH NO TEST PIN.
:USED TO INDICATE A TEST POINT WITH A TEST PIN.
IC1751(MTS/ SAP/ Hi-Fi AUDIO PROCESS/ Hi-Fi HEAD AMP)
TU1001
(TUNER UNIT)
Q1010
SIF 7 BUFFER 57
JK1703
AUDIO-IN(R)
JK1702
69
AUDIO-IN(L)
TO N-A-OUT
6
AUDIO BLOCK
7
1-5-7
SAP
CONT
DET
SIF SAP SAP
DEMOD FILTER DEMOD
STEREO PILOT
62 63
FILTER CANCEL
PILOT
DET
STEREO
PLL
SW
P
R-CH
NOISE
PNR
R
LIM
R-CH
48 47
INSEL
NOR
SW
L-CH
13 14
INSEL
LIM
R
L-CH
SW
PNR
P NOISE
NOTE FOR WIRE CONNECTORS:
1. PREFIX SYMBOL "CN" MEANS CONNECTOR.
(CAN DISCONNECT AND RECONNECT.)
2. PREFIX SYMBOL "CL" MEANS WIRE-SOLDER
HOLES OF THE PCB.
(WIRE IS SOLDERED DIRECTLY.)
MAIN CBA
dBX
ST/SAP
L-R
SW DEC
MATRIX
DEMOD
DC
COMP
R-CH BPF
DEV VCO LPF
OUTPUT
SELECT
HOLD
PULSE
NOISE
MATRIX COMP
DET
DEV VCO LPF
COMP L-CH BPF LIM
PB-AUDIO SIGNAL REC-AUDIO SIGNAL
SERIAL
37
DATA
38
DECODER
RIPPLE
54 P-ON+9V
FILTER
MODE ST/SAP-MODE
40
OUT
DO ENV NORMAL-H
23
DET DET Q1701
N-A-IN
4
A-OUT (L)
80
A-OUT (R)
78
TP1701 TP1702
77 Hi-Fi-L Hi-Fi-R
1
Hi-Fi-H-SW
39
A-MUTE
49
26
CL1401
R
Hi-Fi- A(R)
24
34 33 Hi-Fi -COM
27 Hi-Fi- A(L)
L
1-5-8
SDA FROM/TO
SCL SERVO/ SYSTEM
CONTROL BLOCK
TO SERVO/SYSTEM
CONTROL BLOCK
FROM/TO AUDIO
BLOCK
FROM
SERVO/SYSTEM
CONTROL BLOCK
CYLINDER
ASSEMBLY
Hi-Fi
3
AUDIO
2
(R) HEAD
1
Hi-Fi
AUDIO
(L) HEAD
TD857BLH