Kenwood TK-2302 Service Manual page 35

F
TX-RX UNIT (X57-7570-20)
D3,6
FREQUENCY
CONTROL
/RX VCO
L11 D6
180n
1SV325F
C44
R19 R21
22k 10k 1u
C45
1u
D4,8
FREQUENCY
CONTROL
/TX VCO
D8
L10
180n
1SV325F
2ND_LO
5C
5T
QTTCXO
PLL_UL
PLL_STB
PLL_DAT
2ND_LO
PLL_CLK
B
5R
AFVOLIN
AFVOLOUT
MOD
5M
EN1
EN2
EN3
EN4
EN5
PTT
SIDE1
SIDE2
BATT
EEPROM
IC305
BR24L16F-W
1 8
A0 VCC
2 7
A1 WP
3 6
A2 SCL
4 5
GND SDA
5T_C
5C_C
5R_C
RESET
INT
LEDRX
LEDTX
SB
G
SCHEMATIC DIAGRAM
L18
270n
VCO (RX)
C63
5p(B)
C52
L16
22n
120p
VCO/RX
Q4
2SK1875-F(V)
R27 R30
820k 100k
R26
T:3.03V
27k
L17
270n
VCO (TX)
C64
6p(B)
C53
L15
33n
180p
VCO/TX
Q5
2SK1875-F(V)
D9
1SV278F
MODULATOR
PTTSW
LD
VOX
QTI
R313
THDET
1k
R309
0
PCTV
R310
0
C413
1000p
H
TK-2302/2302
R:3.42V
R36
100 RF AMP
Q9
0.75V
2SC5636
C70
0.5p
(B)
DC SW/
RX VCO
Q7
RT1P430U
L21
R32
680k
R33
Q8
RT1P430U
100
DC SW/
RIPPLE
TX VCO
FILTER
Q10
C71
KTC4075E(Y,GR)
0.5p
(B)
Q6
KTC4075E(Y,GR)
RECTIFICATION
R394
MDSW
47k
R391
1k
61
EN2
62
EN1
63
DEST1
64
DEST2
65
PLL_UL
66
BATT
67
RSSI
68
BUSY
69
VOX
70 MCU
QT/DQT_IN
IC306
71
R5F212CCKCMA
EEPCLK
72
EEPDAT
73
TH_DET
74
DTMF
75
AVSS
76
PCTV
77
VREF
78
AVCC
79
PLLDAT
80 PLLCLK
C334
0.01u
C335
10u
RESET MODE
L303
AFCONT
BSHIFT ON:4.98V
C332
OFF:0V
5p
(B)
Q305
BEAT SHIFT SW
2SC4919
I
V /2306
( )
4.88V
PRESCALER
IC2
UPB1509GV
1 8
VCC1 VCC2
C78 C81
2 7
IN OUT
33p 15p 3 6
IN SW2
4 5
GND SW1
3.82V
R:0.58V
T:5.1V
R:5.02V
T:0.58V
4.05V
RDF/FD
TCLK/DTRDO
SCLK
TDATA/DTRCLK
DTRLOADN
DI/O
PTT
DIR
TXD
STD
1/2_OSC
40
39 R323
APC_SW 38 1k
LEDTX LEDRX
37
RX_SW
36
TX_SW
35
OPTDET
34
TXDATA TXD
33
RXD
RXDATA
32
NC
31
2TONE
30
NC
29
NC
28
NC
27
NC
26
AFMUTE
NC
25
NC
MICMUTE
24
LED_BLUE
23
AF_MUTE
22
MIC_MUTE
21
AUX1
X301
BEAT SHIFT SW
L78-1433-05
Q306
14.746MHz
C337
R319 2SC4919
R321
0
5p
10k
(B)
LEDRX
LEDTX
X57-757 2/4
J
C84
1000p
5C
5T
TH_DET
DC_SW
APC_SW
2ND_LO
B
5R
AFVOLIN
AFVOLOUT
MOD
BUSY
DTMF
W/N
1/2_OSC
QT/DQT_IN
VOX
W/N
MIC_MUTE
PTT
OPTDET
TXD
5M
RSSI
PCTV
AF_CONT
SB
35