Text preview for : B51-8658-00-SDP.pdf part of Kenwood B51-8658-00-SDP Kenwood 144MHz FM Transceiver 144MHz FM Transceiver Kenwood TH-K2AT & K2E & K2ET B51-8658-00-SDP.pdf
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A B C D E
TH-K2AT/K2E/K2ET SCHEMATIC DIAGRAM
1 TX-RX UNIT (X57-674X-XX)(A/3)
MOD MOD
VOLIN VOLIN
5MS 5MS
5T
NAR NAR
TO TO
QT/DQT QT/DQT
5R
5C
ENCA ENCA
ENCB ENCB
5MS
T:0V 2.08V R170
4.7u6.3
56k (D)
R171
R:4.89V 47k
C213
B30-2156-05
B30-2157-05
(D)
D40
D41
TX LED BUSY LED
CTCSS/DCS/WX FILTER
5R
IC17 R157
NJM2902V
R226
R227
330k
R172
C351
100
* R261
0.01u
220
10k
C203
1
120p
14
2 13 T:73mV T:3.29V
2 R158
R:3.39V R:110mV
3 12 330k
R260 * R264 R165
47k
C204
R159
120k
0.033u
C331 4 11 820k
R166
820k
RN1701
V+ GND TX/BUSY
Q47
1000p 5 10 R167
WX1050Hz LED SW
C320
* C350 * R257 * 6 9 180k
2200p
C211
R168 R324 C349
7 8
* R259
C212 180k 47k 0.1u C290 C291
C339
0.047u
RXLED
* C321 0.012u 1000p 1000p
* R344 NOAA
* R258
* Q59
5MV
WX DETECTION AMP SIGIN
C195 R141
T0 TONE
REM
10u10 18k T:4.92V
R140
R145 R146 VOXIN
180k
VR6 R:0V 5T
100k 4.7k 18k
R142
C196
C197
6800p
6800p
3
4.7k
MIC AMP
DCS BAL
R143 IC16
NJM2904V R163
470
ENCB
ENCA
C198
R149
VOLIN
R330 R153 1
MOD
8
5MS
NAR
47k
V+ 560k
1k
R137
470 1u C201 2 7 C208
TH3
100k
R151
4.7k
-t
680
C193 R144 R147 1200p 3 6 82p
R155 R156
R148
4.7u6.3 0 470 VR5 4 5 R164
150k
50k Q27 100k 100k GND
150k
ROTARY C202 10k(D)
2SK1830
100k(D)
ENCODER MAX DEV
R273
R169
&
1k
W/N 270p C210 0.01u
R152
VOL KNOB
ENCA 6
WIDE/NARROW C209 1000p T:4.96V
GND 5 CHANGEOVER SW R:0V
ENCB 4 C235 C236 REM
5MV 5MV
VOLIN 3 0.01u 0.01u C220 C205 R161 C206
VOLOUT 2 1k
R190 R191 4700p 0.047u 0.015u
R180
GND 1
R160
39k
4.7k
47k 47k
4
R174
C207
0.01u
560k
HPF
CN1
IC5
220k
R179
D74,79 NJM2107F
LIMITER C358 C219
R162
C505 C221 R175 C225 R178
180k
3 4
0.047u 0.047u 0.047u 0.01u 2 2.2k 1u 0 Q30
R193
C222
0.01u
R177
1.8k