Tuner Pack Circuit - Panasonic SA-AK18 Service Manual

SA-AK18
SCHEMATIC DIAGRAM-7
MAIN/TUNER CIRCUIT

TUNER PACK CIRCUIT

1
JK101
1
FM EXT ANT
2
75
3
2
GND 4
AM LOOP
5
ANT
3
4
AM EXT
ANT
L102
1uH
AM ANT COIL
2
1
R110
C107
1K
0.047
R118 R119
3.3K 4.7K
C129
6.3V100
C130
6.3V100
C132
1000P
C110
D101
0.01
UDZSTE175R1B
C133
2.6V
27P
(2.6V)
<2.6V>
20
X103
1
C134
27P
R138
3.3K
R130
10K
R152
0
: +B Line
: FM/AM Signal Line
(FOR GN ONLY)
Q2
Q1
2SC2786MTA
2SK544F-AC
Q2
5.6P 2.2P
FM MIXER
RF AMP
Q1
0.001
0.001
220
100K
560K
Q3
4.7P
680K
2SC2787FL1TA
LOCAL OSC
Q3
2.2P
Q4
2SC2787FL1TA
BUFFER AMP
3
4
R143
22K
5
R120
C115
47K
25V4.7
8 6
AM OSC COIL
9 8 7
Z101 RLA2Z007-T
C116
0.033
R112 C108
100K 8P
24 23 22 21 20 19
18
IC101
LA1833NMNTLM
IC101
FM/AM IF AMP,
DET/AM OSC,
MIX/FM MPX
1 2 3 4 5 6 7
2.1V
(2.1V)
<2.1V>
C126 C106
10 0.01
Z102 RLI2021M-T
3
2 4
C147
1000P
1
C148
3
6
0.01
5
R128
82
C125 R111
16V22 390
R151 82
R117
R113
47K
10K
R114 C111
25V4.7
5.6K
R115
C112
R116
560
0.01
1K
13.5V
(1.1V)
0V(1V)
0V(0V)
<13.5V>
<0V>
<0V>
19 18 17 16 15 12
14 13
IC102
LC72131MDTRM
IC102
PLL FREQUENCY
SYNTHESIZER
2 3 4 5 6 7 8 9
R137 R136 R135 R134
1K 1K 1K 470
: FM Signal Line
: FM OSC Signal Line
0V
(0V)
Q101
0V
<0V>
2SC2058SPTA
(0V)
<0.7V>
FM IF AMP
0V
0.47u
(0V)
7
R106
C104 <11.5V>
CF201
1000P
470K
1 3
R105
470
CF202 1
2
6 2
R103
270
3
C101 C102
10P 0.01 16V10
8
Q4
C120
16V10
C131
150P C138
0.01
C139
25V4.7 C142
R142
50V1 6.8K
C141 R141
R102 R123
50V1 6.8K
4.7K 68K
R145
100K
Q106
KRA102MTA
POWER SUPPLY
(FM:ON)
13.6V
(13.6V)
16 15 14 13
17
<0V>
(13.6V)
<13.6V>
Q106
8 9 10 11 12
R124
33
R127 C122
470 50V1
R125
470
R126
R122
1K
2.7K
C149
0.1
R132
10K
11
10
0.3V
(13.5V)
<0V>
R133 1K
40
: AM Signal Line
: AM OSC Signal Line
Q101
C103
0.01
R107
330
R104
1K
C143
6800P
0V
(0V)
<13.5V>
R131
68
13.6V