Kenwood TK-8302 Service Manual page 43

F
TX-RX UNIT (X57-7680-XX)
1
C56
L6 R40 D7
270u 47p 1SV325F
0
D4-11
FREQUENCY CONTROL
(TX/RX VCO)
L9
D6
L5 1SV325F
C54 R38
270n 47p 0
D12
MODULATION
CONTROL (TX VCO)
L7
9CL
R553
0 C871 C572
1p 1p
RF BPF
TUNING
9.03V
HA17358BFEL-E
C587
1
1u
2
3
4
RF BPF TUNING
VOLTAGE DC AMP
ASTC
ASTC
5C
2
DISC
FREQ
G
SCHEMATIC DIAGRAM
C73 6p
Q4
R : 3.87V R : 0.67V
RX VCO
Q4
L19
MCH3914(7)-H
27n
C62
15p
R : 0V
Q5
T : 7.58V
2SJ347F
C74 8p
T : 4.48V
Q6
C61
L18
MCH3914(7)-H
12p 27n
R43
39k
9CL
R : 8.94V
D506,508
RF BPF
TUNING
C575 C577
2p 1p
L515
C583
18n
470p
FRONT-END
LNA
9C
IC501
8
VCC
C592
7
470p
6
5
VEE
17
R708
4.7k
17
X57-7680-XX L305
-23 TK-8302 M2 18n
-15 TK-8302H K2 12n
H
TK-8302/8302H
1
Q9,10
VCO BUFFER AMP
C79 0.92V
R77
6.71V
0.74V
0.5p
0
Q9
C84 C86
2SC5108(Y)F
6p 2p
Q5,7
TX/RX VCO
SWITCH
7.70V
Q7
KRX102U
L24
9CL
R52
R : 3.22V
1k T : 0V
T : 0.84V
Q6
C300
TX VCO
9CL
7.51V 9.03V
Q8
KTC4075E(Y,GR)
8.20V
RIPPLE
R974
FILTER
10
R560
0
R : 8.59V
R562
R : 7.52V
CN506
27
C591 R572
Q506
3SK318
470p 0
R : 4.02V
R : 2.61V
3
D711,712
MIC AMP AGC DETECTION
D711
R719
MC2858
D712
0
1SS372F
R720
MIC MUTE
100
SWITCH
Q702
2SC4919
CN723
C739 R714
L700
0.1u 22k C747 R722
0.1u 2.2k
Q701
2SK1830F
MIC MUTE
SWITCH
2
I
6.93V
2.63V
CN2
C90
Q10
2.5p
2SC5108(Y)F R61
0
9C
9R
T : 8.80V
TX DRIVE AMP
Q300
RD00HVS1-T113
T : 2.76V
L300 L301 L302
15p
6.8n 4.7n 8.2n
L303
T : 2.78V
9T
C546
3p
CN504
L504
C554
18n
4p
D509,510
RF BPF
TUNING
C595 C597
4p 5p
CN507
C601 C603
20p 8p
FRONT-END
NOTCH FILTER
R731
C749 100k
0.1u
MIC/MOD AMP
IC700
NJM2100V-ZB
R868
1 8
VDD
7
0
2
3 6
1.62V 4 5 R867
VSS
0
C924 C754 0.1u
1u
C925 1u
2
J
1
TX/RX
BAND SWITCH
R : 0V
T : 3.29V
D719
HVC131
D720
HVC131
R : 3.33V
T : 0V
R63
4.7k
9T
C322
L304
270p
27n 12n
RF
3
R580 R532
0 0
3
3
SCRAMBLER
SWITCH
Q705
SSM3J05FU-F
3.3C
3.24V
17
HSDO
MIC
DISC
FREQ
2
43
X57-768 2/6