Panasonic SC-AK48, Service Manual

Page: 47 / 104

C
1 3
2
24 23 22 21 20 19 18 17 16 15 14 13
1 2 3 4 5 6 7 8 9 10 11 12
FM
IF
IN
AM
MIX
OUT
REG
AM
IF
IN
GND SD
ST
FM
DET
Vcc STRQ
FM/AM
MONO
OSC
OUT OSC
AFC
AM
RF
IN
AGC
AM
OUT
DET
OUT
PILOT
IN
MPX
IN
PILOT
OUT
Rch
Lch
Z102
1
2
3
4
6
1
2
3
B A D F C E
R127
470
C122 50V1
R122
2.7K
C121
50V0.47
C123 50V1
R131
68
C149
0.1
C147
1000P
R125
470
R126
1K
C148
0.01
R124
33
X102
A B
C106
0.01
C126
1
C127
16V22
C129
6.3V100
R1
19
4.7K
C1
17
0.01
C141
50V1 R141
6.8K
R145 100K
C143
4700P
B
A
C144
4700P
R146
100K
R142
6.8K
C142
50V1
C1
18
0.01
C137
3300P
C131
150P
R123
68K
C138
0.01
C120
16V10
R121
22K
C139
25V4.7
R102
4.7K
C1
19
680P
C1
16
0.033
R143
22K
C1
15
25V4.7
R120
47K
C109
1000P
C1
14
50V3.3
R1
18
3.3K
A
D
B
C
R104
1K
C103
0.01
C104
1000P
R105
470
CF201
R106
470K
1 3
2
CF202
IC101
LA1833NMNTLM
FM/AM IF AMP,
DET/AM OSC,MIX/FM MPX
Q106
KRA102MTA
POWER SUPPLY
(FM:ON)
9 8 7 6 5
SD
Lch
OUT GND
CL
DO
DI
CE
Rch
OUT
To MAIN(DSC) CIRCUIT ( )
on SCHEMATIC DIAGURAM-9
B
Q101
2SC2058SPTA
FM IF AMP
R107
330
SCHEMATIC DIAGRAM-8
11 10 4 3 2 1
A
B
+B(4) +B(3)
STEYE
A
B
A
B
B
A
D
FM
0.12V
P- P
(0V)
0.7V
(0V)
11V
(0V)
14.6V
0V
(14.6V)
14.6V
(4.7V)
4.4V
2.0V 2.0V 2.0V 1.6V 1.6V
(6.1V)
5.8V (1.9V)
0V
2.3V
2.0V 5.8V
(6.1V) 2.0V 2.0V 0V 0V 5.2V 3.8V
(5.3V) 5.8V
(6.1V) 4.7V
(1.2V) 4.8V
(4.3V)
14.6V
7.7V
FM LINE +B
:POSITIVE VOLTAGE LINE :FM SIGNAL LINE :AM SIGNAL LINE :AM OSC SIGNAL LINE
(1.5V)
1.3V (2.0V)
2.4V (2.0V)
2.4V
SA-AK48
47