Panasonic SA-AK88 Service Manual page 39

SCHEMATIC DIAGRAM-3
MAIN(TUNER) CIRCUIT
TUNER PACK CIRCUIT
Z120 FM FRONT END (RAL0029)
JK101
FM ANT
1
75
GND
2
3
4
5
AM ANT
EXT
LOOP
R110
1K
R114
5.6K
R152
0
Q1A
2SK544F-AC
RF AMP
C1A
D
5.6P
G
S
L102
0.39 H
Z101
AM ANT
X103
C112
(7.2MHz)
0.01
2.6V
2.6V
20 19
1 2
2.6V 0.6V
2.6V 0.6V
R130
10K
R138
3.3K
A
:POSITIVE VOLTAGE LINE
C3
2.2P
R3
220
R4 R8
100K 680K
C7
4.7P
C8
3.3P
Q3
2SC2787FL1TA
LOCAL OSC
A
B
C
AM OSC
D
R116
1K
1.3V 0.9V 0.9V 5.2V 0V
3V 0.9V 0.9V 5.2V 2.5V
18 17 16 15 14
IC102
LC72131MDTRM
PLL FREQUENCY
SYNTHESIZER
3 4 5 6 7
0V 0V 5.2V 4.7V
0V 0V 5.2V 0.2V
B C D
:FM SIGNAL LINE :AM SIGNAL LINE
:FM OSC SIGNAL LINE :AM OSC SIGNAL LINE
Q2
2SC2786MTA
L2
FM MIXER
0.47 H
7
6
R11 C10
680K 18P
Q4
2SC2787FL1TA
BUFFER AMP
8
R111
390
R128
82
R129
27K
C124
100P
2.5V 0V 0V
0V 0V 0V
13 12 11
8 9 10
4.3V 0V 0.1V
4.6V 0V 14.7V
R132
10K
R133
1K
R103
270
A
B
C
D
E
F