Kenwood NX-720 Service Manual page 71

U
TX-RX UNIT (X57-8230-1X)
B-BUS
.
D703 .
2SC4738(GR)F
D703,704
DA3S101F
R775
AF Detector
5.6k
.
MIC2
D704
DA3S101F
.
R777
.
10k
Q703
.
MIC SUM 2SA1832(GR)F
MIC2
R769
.
. .
680k
C774
C765 R778
27k
22p 0.1u
MIC SUM
.
AMP/LPF(DI)
BU7462NUX
.
C743
47p
.
R748
.
100k
C735
10u
Reverse
Current Prevention
R:4.75V
T:0V .
R741
47
.
C741
0.22u
.
C732
.
1000p
Q702
KTC4075E(Y,GR)
Noise AMP
3.3V
RX SUM
AMP/LPF(RX AF)
.
IC711
BU7462NUX
1
VDD
2
+
-
3
+ -
4
VSS
.
C777
0.1u
B-BUS
V
SCHEMATIC DIAGRAM
.
Q703,704
Q704
MIC AGC
.
Mute(MI2)
.
. .
Q706
SSM3J15FS
C782
R787 C812
12k
0.1u 10u 10
.
Mute(MI1)
Q705
SSM3J15FS
IC703
. .
.
R756 C784
R751
100k 1k
10u
33A_2
ASQ
.
Noise Detector
.
D702
R750
1SS422
39k
.
R837
5.6k
. .
C704 R703
1u 10
.
R705
8
68k
7
.
6 R710
56k
5
W
NX-720(G)/720
. .
R823 C806
SPAF
12k
1u
.
.
.
C791
C796
R816
MI2
10u 10
12k 1u
. PAAF
C790
MI1
.
10u 10
R847
22k
.
R846
22k
.
C778
1u
10
.
C779 100p
7
VoUT3
VoUT2
24
CN710
8
VoUT4
VoUT1
23
.
D/A Converter
9
VIN4 VIN1
IC712 22
10
VIN5 R2A20178NP
VIN8
21
11
VoUT5
VoUT8
20
12
VoUT6
VoUT7
19
D512,513
Reverse
MIC/RX
Current Prevention
.
Selector(BINT)
.
IC713
TC7W53FK(F) R637
.
.
D513
5 4
R638
A
GND
6 3
DB2S310
CH1
VEE
.
Line Protection
7
2
CH0
INH D512
8
1
VCC
CoMMoN
DB2S310
.
C786
0.1u
MIC
X
AF AMP
IC714
1.44V
AC
Bias
1.44V
. .
R819 C797
2.2k
0.22u
. .
R820 C798
. 2.2k
0.22u
Q709
2.7V
SSM6N37FE .
R813
1k
.
Q708,709
Q708
LTC014EEBFS8
AF Mute Switch
SDO0
SCK0
/EVCS
17
.
DEO
R796
C788
4.7u
0
20
18
19
. D705
D706
DI
EMZ6.8N
EMZ6.8N
R797
0
D705,706
Line Protection
1k
1k
CN720
D_RXD2
Y
6.5V
AC
6.3V Bias
R811
. 10k
F701
SB
2.5A
.
J701
GPSC
DATO
/IGN
DATAI
SP2
SP+
SP-
MIC
ME
B-BUS
71
X57-823 5/10