Tx-Rx Unit (X57-674X-Xx)(A/3) - Kenwood 144MHz FM TRANSCEIVER K2E Service Manual

A
TH-K2AT/K2E/K2ET

TX-RX UNIT (X57-674X-XX)(A/3)

1
2
3
ROTARY
ENCODER
&
VOL KNOB
ENCA 6
GND 5
ENCB
4
VOLIN 3
VOLOUT 2
GND
1
4
CN1
J3
PTT
MIC
IM
MIC
5MS
5
J4
SPG
REM/TXD
SP
SPK
AFO
CN2
1
SPK
SP
2
8 OHM SPG
13.8V
J2
DC IN
6
REVERSE CURRENT
PREVENTION
BATTERY
TERMINAL
7
50
X57-674 1/5
B
MOD
VOLIN
5MS
NAR
TO
QT/DQT
ENCA
ENCB
R264
*
C331
1000p
WX1050Hz
C320
* C350 *
R257
*
C321
*
WX DETECTION AMP
C195
R141
T0
18k
10u10
R143
470
C193
R147
R144
4.7u6.3 0 470 VR5
50k
MAX DEV
W/N
WIDE/NARROW
CHANGEOVER SW
C235 C236 REM
0.01u
0.01u
R190 R191
47k 47k
D74,79
LIMITER
C505
0.047u
R192
470
D79
D74
DA221 DA221
R194
10k
R195 R196
100 10k
R197
100
IM
MIG
TXD
R199 R201
R200
1k 4.7k
10k
C246 DISCHARGE
C246
100u10
SP MUTE
SPEED UP
REVERSE CURRENT
PREVENTION
D25
D32
MA2S111
L50 RB051L-40
R203
C352
470k
C270
1000p
1000p
D80
C338 RB521S-30 D80
REVERSE CURRENT
1u
C506 PREVENTION
1000p
15
R332
D30
RB521S-30
R210
12
13.43V
Q33
R211
2SB1184(Q,R)
470k
CHARGE SW
C285
1000p
D31
DA221
CONSTANT-
CURRENT
CIRCUIT
11.5V AVR
Q34
2SK1830
Q33 OPERATION SW
BTEMP
CHARGE
C
SCHEMATIC DIAGRAM
T:0V
R:4.89V
CTCSS/DCS/WX FILTER
IC17
R157
NJM2902V
330k
1
14
2
13 R158
3 12 330k
R165
4 820k
11
V+ GND
5 R167
10
6 9 180k
7 8
C212
0.012u
* R344
Q59
*
R145 R146
VR6
100k
4.7k 18k
DCS BAL
C198
R330 R153
1k
470 C201
1u
1200p
R156
R155
100k 100k
Q27
C202
2SK1830
270p
5MV
C220
4700p
HPF
IC5
NJM2107F
C358 C219
C221
4
3
0.047u 0.047u
0.01u 2
1 5
V+
MIC
RXD
MUTE
SW
R183
PTTE
Q29
33k
2SC4919
R182
1k
D22
1SS361
MIC MUTE
MICM
CONTROL
PTTE
VOLOUT
D26
SP MUTE SW
3.23V
Q56 L49
CPH3417
Q31
2SK1830
C253 R206
10u10
Q31
Q56 OPERATION SW
D33
RB051L-40
C353 1000p
11.45V
C284
D33,35,36
REVERSE
1000p
Q35
CURRENT
2SK1830
PREVENTION
DC IN
D35
DETECTION
RB521S-30
C282 1000p
Q36
D36
NI-MH
TEMPERATURE
RB521S-30
DETECTION
1000p
C281
D
5MS
2.08V
R170
47k
(D)
TX LED
T:73mV
R:3.39V
R168 R324 C349
180k 47k 0.1u
T:4.92V
R:0V
5T
MIC AMP
IC16
NJM2904V
R163
1 8
560k
V+
2 C208
7
3 82p
6
4 5
R164
GND
10k(D)
C210 0.01u
C209 1000p
T:4.96V
R:0V
5MV
C205
R161 C206
1k
0.047u 0.015u
R175 C225 R178
2.2k 1u 0
Q30
2SC4617(R)
VOX
DETECTION AMP
D27 D24
C229
C228 MIC ALC
RECTIFICATION
0.1u 0.1u
RB706F-40 MA742
VOX DETECTION
RECTIFICATION
RXD
IM
MIG
TXD
SPM
IC6 TA7368F
1
10
7.07V
POUT 1
2
9
PW-GND VCC
8
3
PRE-GND
C252
7 R207 R209 R223
4
PHASE VIN
1k 100k 220k
100p 6 5
NF RIPPLE
15
AF AMP
DTMF/BEEP/1750/W-ALT
F1
5C/5R/5T AVR
2.5A
13.58V Q37 7.07V
F3
2SB1184(Q,R)
8V
Q37
0.5A
AF AMP/
LAMP AVR
Q38
2SC4617(R)
AVR
4.80V
CONSTANT-
VOLTAGE
Q36
2SJ347
4.31V
Q38
Q37 OPERATION SW
E
MOD
VOLIN
5MS
5T
NAR
TO
QT/DQT
5R
5C
ENCA
ENCB
BUSY LED
T:3.29V
R:110mV
TX/BUSY
LED SW
C290 C291
RXLED
1000p 1000p
NOAA
5MV
SIGIN
TONE
REM
VOXIN
D27
D24
MICM
R224 C258
DTMF/BEEP
18k 0.1u
+B
RXD
PTTE
IM
MIG
TXD
SPM
5C/5R/5T AVR
8V
AFAMP
5M
BTDET
DCDET
+B
BTEMP
CHARGE