Kenwood TK-80 Service Manual page 100

A
TK-80
TX-RX UNIT (PLL SECTION) (X57-4660-21)
1
5.3V
W1
C800
1
NBI
TX-RX
0.01u
-W1
NBG
2
TP801
NB
2
Q800
SWITCHING
NB ON : 2.8V
OFF : 0V
Q800
DTC114EK
NBS
TO TX-RX UNIT
RBK
8A
RTK
R657
100
3
CN500
16
GND
15
VDLY
14
VB1
13
VB2
12
VB3
11
ULK
R655 100
10
PCK
R654 100
9
PDA
CONTROL
-CN5 R651 100
8
PEN1
R656 100
7
PLS
6
NC
R652 100
5
DEN1
4
R658 100
4
CASL
R653 100
3
DEN2
R659 100
2
ABSL
1
GND
5
R919
470
6
C910
1u
5A
8F
TO TX-RX
MIC
UNIT
SP
7
VOXO
VOXS
88
X57-466 (PLL) 1/2
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B
SCHEMATIC DIAGRAM
Q801-804
AMPLIFIER
6.8V
1.8V
L802
6.8V
Q801 R819
7.5V
2SC2714(Y)
0
Q802
2SC2714(Y)
Q804
2SC2714(Y)
4.6V
5.3V
R804 R807
0.1V
22k 10k
NB ON : 0V
OFF : 7.7V 6.8V
NB ON : 1.0V
Q803
OFF : 7.8V
2SC2712(Y)
SWITCHING 5.0V 5.0V
L508
0V
100u
VDD
0V
VSS
IC508
TC4S66F
0V
IC502
MB86001PF
C653 220p
PLL
C657 220p
C658 220p
C654 220p
5.0V
L500
100u
D500,501
SWITCHING
5.0V
L501
100u
DELAY
0V
R902 C902
VOX ON : 0.6V
100k 100u10
+
Q900
Q903
C904 R906
VOX
1u 10k
AMPLIFIER
1.3V
1.3V
R900 C903
10k 1u
0.7V
GAIN
Q900
R913
2SC2712(Y)
10k
ANTI
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C
Q805,807,808 Q806
SWITCHING BUFFER AMPLIFIER
C812 R815
L803
10p 56k
4.7V
Q806
D800
2SC2714(Y)
0.3V
HSM276S
4.0V
C813
0.7V
Q808
0.01u
DTC114EK
1.1V
DETECTION
0V
7.7V
Q805
0.16V
2SC2712(Y)
R809
Q807
1.5k
DTA114EK
7.8V
C527
1.0Vp-p
0.01u
R547
5.0V
2.0V
1.2k
R546
18k 2.0V
1.5V
2.0Vp-p
34 22
DA10 VSS4
35 21
DA11 DA3 3
36 20
VSS8 DA2 2
37 19
PHS0 IC500 VSS3
38 18
F71022Z
PHS1 DA1 1
39 17
DDS
VSS9 DA0 0
40 16
CLK VSS2
41 15
VDD5 CHOP
42 14
ISD NCNP
43 13
ISC VDD2
44 12
IEN TDA3
AMPLIFIER
OFF : 4.4V
IC900
0V
VOX ON : 0.66V
NJM2904M
8.0V
OFF : 0V
1 8
VOX INPUT VCC
7
ON/OFF 0V
C906 2
0V
3 6
0.01u
R909
4 5
GND
0V
10k
0V
0V
Q903
DTC114EK D900-902
REVERSE-FLOW PREVENTION
D
TP504
CV
VCO1
L545
3.3V
0.68u
73.145-83.544MHz
C671 C675
39p 9p
L546
VARI-
CAP
4.0V
0V
C528 C529
1u16 1u16
+
+
7.5V
3.3V
Q508
Q510
2SC3722K(R)
2SC3722K(R)
Q509
0.36V
2SC3722K(R)
1.0V
Q508-510
LPF
5.0V
L502
100u
34
5.0V DA10 VSS4
35
DA11 DA3
L503
36
VSS8 DA2
100u 37
PHS0 IC501 VSS3
38
F71022Z
PHS1 DA1
39
DDS
VSS9 DA0
40
CLK VSS2
41
VDD5 CHOP
42
ISD NCNP
43
ISC VDD2
44
IEN TDA3
0V
VOX ON : 0.1V
NOR CIRCUIT
OFF : 0V
IC901
R912 1M
TC4001BFT
D900
1 14
VDD
1SS355 13
2
R917
12
3
470k
0V
4 11
D901
10
1SS355 5
0V
C909
6 9
7 8 2SC2712(Y)
1000p
VSS
SWITCHING
VOX ON : 0.64V
OFF : 0V
E
8A
Q531
2SK508NV
(K52)
D503
SWITCHING
R663
3.3k
Q530
DTC114EK
SWITCHING
VB2
VB3
8A
FIN
22
21
3
20
2
19
18
1
17
0
16
15
CHOP
14
13
12
RIN
5A
CLK
8.0V
VOX
ON/OFF
VOX ON : 8.0V
OFF : 0.5V
Q902
DTA114EK
R907
100
VOX ON : 0V
OFF : 8.0V
R918
4.6V
10k
Q901
VOX
ON : 7.9V
OFF : 0.1V