Kenwood TK-880 Service Manual page 20

F
TX-RX UNIT (X57-6450-XX) (A/2)
A1 X58-4550-10 (VCO)
R117 100
RX OSCILLATOR
Q101
C125 2SK508NV(K52)
R111 C122
4p
47 0.5p
Q106
2SC4226-A(R24)
BUFFER AMP
Q105
2SC4081
TX / RX SW
R107
10k
Q104
2SC4081
TX / RX SW
Q103
2SK508NV(K52)
TX OSCILLATOR
9CL
CV
HT
8CL
8C
9C
W/N
T/R
MO
TO
BEEP
8R
PSW
AFO
IGN
SB
8.06V
8C
KEY
CK
DT
RSSI
ES
EN
DEO
OE
R39
100
4.41V
R14
47k
5
6
7
8
R408
0
TA75W558FU
8.06V
AMP
DI
SUMMING AMP
5C
PTT
HOR
C429
10u10
Q402 Q403
DTC114EE DTC114EE
5C
SQ
ME
LOK
AHK
IGN
FC
G
SCHEMATIC DIAGRAM
C115 L107 R104
1n
4p 100
L105 C104
8p
TC106
C107
5p
10p
R113
INVERTOR
R109
180
Q102
10k
DTC114EUA
R105
105k
C116 C113 C112
5p 1.5p 1p
L106 C105
6p TC109
10p
C110
4p
IC4
ANALOG SW
TC4S66F
5
VDD
1
2
DC SW
4
3
Q1
VSS
2SK1824-A
4
R33
C29
5.6k
3 10u10
C36
R44
2
150k 10u10
1
R406 $R407
390k
IC3
C31
10u10
HOR SW CONTROL
R58
Q6
1k
DTC114EE
R50
10k
DTC114EE
HOR SW
HOR SW CONTROL
Q4
DTD114EK
H
TK-880/880H
RX VCO
L101
D103 R101
1.5n
1SV283F 100
RX VCO
CN101
1
ST
HT
E
R118
9CL
8CL
0
R103 68k
MD
CV
MODULATION 7
TX VCO
L102
D104 R102
1SV283F 1.5n 0
TX VCO
8.77V
9.59V
C201
*
* R202
* L200
N:0.12V
W:4.96V
$R43
A/D CONVERTER
$R38
IC5
R37 M62363FPDFOJ
1 24
0
VIN1 VIN8
2 23
VOUT1 VOUT8
22
3
VOUT2 VOUT7
21
4
VIN2 VIN7
5 20
VDD GND
6 19
LD RESET
7 18
CLK VDAref
8 17
DI DO
16
9
VIN3 VIN6
15
10
VOUT3 VOUT6
14
11
Q5
VOUT4 VOUT5
12 13
VIN4 VIN5
5.13V
13.28V
PSW ON:0V
I
TP1
C55
2p
6.75V
8.06V
R59 0
R:7.79V
T:0V
L203
L79-1585-05
C204 C207
1000p 10p
C214
7p
TV
D203,204
VARI-CAP
TUNE
R41 R42 R45
R:0.05V
1.2k 100k 100k
T:4.36V
R:2.53V
T:4.99V
DC AMP
IC6
TA75W01FUF
1
5.11V
2
2.36V
3
4
X57-6450-XX(A/2) R202 C201 C421
-10 K 4.7 NO NO
-13 HK NO 12p 1000p
X57-645 (A/2) 2/4, X58-455 1/1
J
BUFFER AMP
Q7
2SC5110-F(O)
8C
KEY
T/R
RSSI
PC
8R
R:1.73V
T:0V
L205
10n
D200
HSM88AS
OVER VOLTAGE
PROTECTION
LOW:1.55V
CENTER:3.98V
HIGH:8.01V
DEO
W/N
STR
9C
SB
IGN
OE
ES
DT
CK
5C
8
7
6
5
HNC
SQ
ME
LOK
AHK
IGN
PSW
BPO
L200 L208
NO NO
18n 22n
17