Kenwood NX-720 Service Manual page 73

AE
TX-RX UNIT (X57-8230-1X)
THP1
/T_R
L1
TEMP
GND1
VCC
GND2
oUTPUT
X1
L77-3073-05
C3
0.01u
.
AVR(33C)
.
IC409
NJM2878F4-33
R825
50M
0
SBC2
80C R429
R431
0
0
DC/DC Converter
Q415
2SC4738(GR)F
DC Switch(150C)
Q414
EMD9
L302
3.80V
560n
C315
R303
1k 0.01u
0.64V
.
C307
0.1u
.
C337
IF_DET
0.1u
SP+
SP-
MIC
ME
POWER
AF
SCHEMATIC DIAGRAM
3.31V
.
.
.
L2
R72
4.7u
1k
3.3V
D408,409
DC/DC Converter
D408 D409
DB2S310 DB2S310
13.9V
150C
DC/DC Converter
Q416
2SA1832(GR)F
3.3V
20kHz
CN302
C322
100p
L304
C316 C324
R306 R315
56n
330k 0
10p 33p
3
1
Tripler
2
Q303
2SC5108(Y)F
CF1
L72-1017-05
C313 R323 C327
R308
IN oUT
0
0.1u 0 0.1u
.
R326
330
. CN303
CF2
.
.
L72-1040-05
IN C343
oUT R337
1k
0.1u
AG
NX-720(G)/720
C10 0.01u
0.01u
C11
13 6
CPout
NC_1
5
14
NC_2 VCCcp
.
.
15
4
NC_3 LD/PS
IC2
C20
16
3
SKY72310-362
NC_4
Fin
100p
PLL System
17 .
2
Fin
NC_5
R10
18
1
NC_6 VCC
. 10
.
C22
L3 .
0.1u
C23
.
100p
.
100p
C16
.
C17 100p
.
C18 100p
100p
C19
R435
0
CV
.
R13
47k
100k
DC AMP
(CV/Assist)
.
C359
0.01u
.
FM System
.
IC303
.
TK10931VTL-G
C330
C347
0.1u 1 OSC<B>
RFin
24 0.01u
2 OSC<E> .
4.70V
GND 23
C345
3 MIXo
COMPo 22
4 VCC
.
21
COMPi
R332 0 5 AMIFi
. .
NAMPo 20
C332 0.1u 6 AMIFdecp C342
.
NAMPi 19
C333 0.1u 7 FMIFi 1u
.
AGC 18
C334 0.1u 8 FMIFdecp1
.
AGCAMPo
17
C335 0.1u 9 FMIFdecp2
.
RFAGCo 16
10p
C326 10 LIMo
RSSIo 15
11 QUADi
14
AMSW
12 FMDETo
13
AMDETo
AH
.
C31
100p
. . .
R19 R20 R24
0 0
390
.
C24
0.1u
.
C25
100p
.
R14
47k
.
Over Voltage
C26
Protection
100p
.
Q2
2SJ648-A
DC Switch
(Assist)
.
R28
10M
.
IC3
BD7542FVM
1 oUT1
VDD 8
2
- +
7
3 .
+ - 6
R26
ASSIST
4 VSS
5
1k
.
. C28 100p
C30 1u 25
CN304
4.51V
.
C371 C367
R355
0
0.01u
0.01u
1st IF AMP
C361
0.1u
Q305
.
2SC4215-F(Y)
0.01u
R342
100k
.
R345
0
.
DC AMP(RSSI)
R344
IC304
2.7k
BU7445HFV
R350 5
1 IN+
VDD
10k
R358
. 2 VSS
33k
R343
3 IN- 4
oUT
22k
C351
100p
CN306
X57-823 7/10
AI
THP1
50C
/T_R
33C
FIN
L5
DC Switch
.
(Assist)
Q1
LTC014EEBFS8
150C
B-BUS
0.96V
3.30V
SP+
SP-
MIC
ME
B-BUS
POWER
73