Kenwood 144MHz FM TRANSCEIVER K2E Service Manual page 55

P
SCHEMATIC DIAGRAM
TX-RX UNIT (X57-674X-XX)(A/3)
MOD
VOLIN
5MS
5T
+B
NAR
TO
QT/DQT
5R
5C
TEMP
FINAL
AFM
KAPC
DATA
CLOCK
SHIFT
PLLLD
PLLEN
SMV
SQV
BPF/APC
1.58V
AF FILTER
Q21
2SC4617(R)
C167
0.1u
Q20
2SK1830
AF MUTE SW
Q
CN15 CN17
*
D1,2
LV
VCO FREQUENCY CONTROL
L68
C2
L1 D1
10u 1000p
1SV325
D5
D5
C4
FREQUENCY SHIFT
1000p
HSC277
Q3
2SK1830
SHIFT VCO SHIFT CONTROL SW
R31 R30
2.2k 1.2k
C50 22p
D16
PLL LOCK DETECTION
R35 120k
FREQ D16
VR1
MA2S111
R37 56k
C40 0.1u
500k
4.63V
R36 10
VC VCC
12.8MHz
L64
C51
GND OUTPUT
4.7u
22p
X1
L77-1931-05
R116
120k
C169
C170 R119 R122
1.8k 2.7k
0.068u 0.068u
R117
2.7k (D)
Q22
RN2105
R120
2.7k
WIDE/NARROW
CHANGEOVER SW
W:111mV
N:4.79V
R
TH-K2AT/K2E/K2ET
D6 R11
R13 6.8k
VCO MODULATION
Q1
2SC5066(O)
RF AMP
L3 82n
Q2
VCO
2SC5488
C13
0.5p
R7
(B)
47k
Q4
4.45V
RIPPLE FILTER
2SC4617(R)
3.63V
SPEED UP
C37
1000p
C38
0.01u
R32
PLL IC
1k
5C
CP2
3.9k
PLLEN
DATA
CLOCK
PLLLD
CF1
L72-0968-05
450kHz
T:0V
R:4.63V
5R
C173
180p
SQ FILTER
C174
180p
FM IC
R124
R123 3.3k
R128 C180
1.8k
3.3k
120p
CD1
450kHz
5R
S
TEMP
FINAL
KAPC
C19
15p
150k
RF AMP
C15
R348
220 Q5
12p
2SC5488
C24
L53 15n R19 120k
1000p
C22
18p
C20
8p
Q6
2SC5488
RF AMP
4.45V
R131 330k
4.76V
2nd L.O.
0.53V
C187
C166
2.2k
0.01u 2p
Q23
KTC4082
TRIPLER
IC3
TA31136FN
4.82V
C190
R134
0.01u
390k
0.72V
IF AMP
C191
Q24
2SC5488
0.01u
T
5T
+B
FINAL
KAPC
TEMP
R132
5R
5R
BPF/APC
X57-674 4/5