Kenwood TK-2170 Service Manual Supplement page 34

P
TX-RX UNIT (X57-700X-XX) (B/4)
TX
OPTDET
DACCLK
RXD
TXD
DACLD
BEEP
SHIFT/MODEL
PTT
XIN
XOUT
AM2
DACDAT
HSDIN
LSDOUT
HSDO
MDSW
EEPROM
IC9
CAT24WC64WI
1 8
A0 VCC
2 7
A1 WP
3
6
A2 SCL
4 5
VSS SDA
EEPDAT
EEPCL
IC10
TK62012F
1
2
3
C61 4
VSS
0.1u
LSDIN
DET AMP/VREF
RX DET MUTE
RSSI CONTROL VOLTAGE
DISCHARGE
VOXIN
SSM3K15TE(F)
D17 MA2S111-F
R84 180k
DMUTE
FLASH
MEMORY
VOXMUTE
OPST
MMUTE
AQSFT
SP_M
STSW
RXD
TXD
5MS
SB
5R
5C
5T
SSB
Q
SCHEMATIC DIAGRAM
CPU CLOCK
SHIFT SW
Q17
2SC4649(N,P)
R96
1k
8
VDD
7
6
5
RX AF MUTE
Q14
AF REFERENCE
VOLTAGE BIAS SUPPLY
D28
RB706F-40
R93
39k
C423
4.7u
R
HSDIN
C77
R103
1M
0.015u
LSD FILTER
IC11
TK62012F
5V
1
8
VDD
C85
C73
0.012u 2 7
3 6
R114 47p
180k 4
5
VSS
C93 1u
DI9
C129
R109 R159
R106
47k 820k
470k 1u
TX SUM AMP
IC12
TK62012F
1 8
VDD
2 R143
7
3 6 47k
4 5
VSS
C107
0.1u
C176
R176
68k 0.22u
R100 R104 C78
22k 10k 220p
R101 R105
10k
4.7k
Q33
2SJ347F
C104
C96
C91
R125
C90
R115
C189
5V
7.4V
CN60
E40-5932-05
S
TK-2170
0.1u
C130
AF SW
SPLI
IC14
TC7W53FK(F)
C117 1 8
CoMMoN VCC
1u
2 7
INH CH0
3 6 R171
VEE
CH1
4 5
GND
A
R144
4.7k
RX HSD FILTER
R140
IC15
TK62012F
1k
1 8
VDD
C114
2 7
0.1u 3 6
4 5
VSS
TX HSD
SIDE TONE
MUTE
R245
10k
C81
0.1u
0.1u
1u
0.1u
1.5k
0.1u
10k
0.1u
STSW
X57-700 (B/4) 4/6
T
OPTDET
DACCLK
RXD
TXD
DACLD
PTT
AM2
DACDAT
EXTLIMIN
TX
0
FILTERO
VOXMUTE
OPST
MMUTE
AQSFT
SP_M
5MS
SB
5R
5C
5T
31