Kenwood TK-80 Service Manual page 98

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