Kenwood TK-80 Service Manual page 98

P
TX-RX UNIT (TX-RX SECTION) (X57-4660-21)
R208
TXB 1k
10.695M RX
1.5V
Q35
AGC
2SC2712(Y)
RXB
AMPLIFIER
R175
47
Q30
BMDO
3SK131
(M)
Q30,31
AMPLIFIER
SWITCHING
D33
DTC114EK
SWITCHING
L53
100u
AMB
SCB
SSBCW
6
AM
8F
TXB
IC4
NJM2594V
R265 1 8
6.4V 0V
2 7
100
5.6V 2.8V
3 6
4.8V 2.7V
4 5
0V 2.7V
C292
0.01u
Q50
AMPLIFIER
R259
100
CARS
7.6V
VR7
Q50 10k
2SC2712(Y)
4.3V
C289
3.7V
4.7u25 R264
+
220k
D63
HSM88AS
BMDI
7
IC1
IC1
BU4066BCFV
SWITCHING
1 14
2.9V
2 13
3 12
C270
10u16
4 11
+
5 10
6 9
C271
4.7u50
7 8
+
AMPLIFIER
1 8
2 7
3
6 2.3V
4
5 2.3V R242
100k
IC2
2.8V
R241
NJM2904M
39k
MIC
5
3
AMB
14AF
5A
8A
RBK
Q
D55
R207
7.2V Q33
HSM88AS
4.7k
2SC2712(Y)
C245
47p
DETECTION
Q33
RX IF BUFFER AMPLIFIER
Q31
C225
3SK131
47p (M)
7.0V
L75
C227
0.01u
1.9V
VR4
47k
R : 0V
IF
T : 5.2V
GAIN
RXC
Q38
Q36
SWITCHING
SSB. CW : 6.2V
R154 R194 R192
2.2k
C234 R190
1k 220k
0.012u
Q32
2SC2712(Y)
R193
SSB. CW
22k : 3.8V
Q32
AMPLIFIER
0V
IC4
BALANCED
MODULATION
TH8
R269 R271
1k
220k 2.2k
R : 0V R : 0V
T : 1.1V T : 3.4V
R267
330
Q51
R : 0V
2SC2712(Y)
R263
T : 0.4V
AMPLIFIER
220k
VR8
10k
CARS
D63
REVERSE-FLOW
PREVENTION
7
AGC
TP2
VR6
10k
5.0V
TP3
R244
D60,61
100k R240
REVERSE-FLOW
PREVENTION
330
5
5
14AG
3 1
8
J6
KEY
TO PLL UNIT
R
SCHEMATIC DIAGRAM
4.4V
D54
HSM88AS
C240
3p
4.2V
D52-54
DETECTION
7.0V D52
HSM88AS
L76
1.9V
Q38
D53
DTC114EK
HSM88AS
R212 D56 C253
0 RLS135 0.01u
SWITCHING
AM : 6.2V
R205 R203
C242 R201
1k 220k
0.01u 47k
Q34
R204
2SC2712(Y)
220k C243
10k
AM : 3.8V
0.033u
R209
Q34
220k
AMPLIFIER
AUDIO AMPLIFIER
IC7 LA4446
1.2V
11.7V 0V
0V
6.8V
11.7V
12.8V
1.1V
6.8V
0V
12.8V
7
R290
100
6.2V 2.4V 0.4V 3.8V 3.9V 3.1V
3.6V
CH1
BASS/TREBLE VOLUME/BALANCE
CONTROL,BIAS,REF VOLTAGE
CH2
BASS/TREBLE VOLUME/BALANCE
3.8V
2.6V
0V 3.8V 3.9V
3.1V
C391
10u16
+
8
5
KEY UP : 5.0V
KEY DOWN : 0V
D61
1SS355 D60
1SS355
CN14
S
TK-80
L78
47u
PKDG
2
PKD
1
PKS
D28 SWITCHING
ANO
PSQ
4
GND
RTK
1
SS
3
D28
1SS355
3
Q81
8
7
DTC114EK
Q80,81
SWITCHING
Q80
D49
DTA114EK REVERSE-FLOW
PREVENTION
CN9 W4
1 CAR
2 GND
CN10
1
SP
SPG
2
J5
2
EXT. SP
C378
FINAL UNIT
0.01u
(X45-352) (B/2)
C379
CN11
0.01u
1 1
PH1
PH2
PHG
3 3
CN800
6
CN12
1
MIC
MICG
NC
SPO
SPOG
5
CN13
1
AF
AFG
MIC
8
MICG
4
7
0V
0.3V 5.0V
8
CH1
8
CIRCUIT
IC6
TA8184F
CH2
ELECTRICAL
VOLUME
0V
0V
4.1V
R368
SWITCHING
47k
Q46
DTC114EK
R405
27k
8
CONTROL-CN4
X57-466 (TX-RX) 4/4, X45-352 (B/2) 1/1
T
J2 1
ACC2
3
5
7
2
6
8
4
1
2
CAR
TO
GND PLL-CN503
SP
J800
R800
100
3
R801
100
PHONES
MIC
MICG
LCD ASSY
AGND
-CN2
SPO
SPOG
AF
4
SEL-CALL
AFG
-CN1
MIC
(OPTION)
MICG
J1
ACC1
2 6
1
3
5
4
5
8
PSQ
4
6
17
7
87