Kenwood NX-820H Service Manual page 71

U
SCHEMATIC DIAGRAM
TX-RX UNIT (X57-8240-1X)
B-BUS
D703,704
D703 AF Detector
DA3S101F
D704
DA3S101F
MIC SUM
R769
680k
C765
R778
27k
22p
C743
47p
R748
100k
DI
R741
47
C732
1000p
Noise AMP
Q702
KTC4075E(Y,GR)
RX SUM AMP/LPF(RX AF)
RX SUM
BU7462NUX
1
2
3
4
VSS
B-BUS
V
Q 7 0 4
2SC4738(GR)F
R775
Q703,704
5.6k
MIC AGC
R777
10k
Q703
2SA1832(GR)F
Q706
SSM3J15FS Mute(MI2)
Q705
Mute(MI1)
C774 C782 C812
R787 SSM3J15FS
1 2k
0.1u 0.1u 10u 10
IC7 03
BU7 46 2 NU X
MIC SUM AMP/
LPF(DI)
C784
R751 R756
100k
1k
10u
Reverse
Current Prevention
ASQ
CN701
D702
1SS422
R750
C741
39k
0.22u
Noise
Detector
R837
5.6k
IC711
C704
R703
56k
1u 10
R705
VDD
68k
8
- +
7
R710
+ -
6
56k
5
C777
RXAF SMF
0.1u
W
NX-820H(G)/820H
X57-824X-XX
0-10,0-11 NX-820H(G)/820H K
0-12,0-13 NX-820H(G)/820H
{ 1.44V
MM2 DC
1.44V
Bias
C806
SPAF R823 R819
12k
2.2k
1u
C791
R816 C796 R820
PAAF
MI2
10u 10 12k 1u
2.2k
C790
1 0 u 10
R847
INAMT
22k
R8 4 6
PA
22k
MM
Q709
SSM6N37FE
Q708,709
AF Mute Switch
DI
SDO0
SCK0
/EVCS
7
VoUT3
CN710
8 VoUT4
9 D/A Converter
VIN4
IC712
10 VIN5
R2A20178NP
11
VoUT5
12 VoUT6
33A_2
/IGN
X
R781
0
K2 NO
I C7 1 4
1.44V
1.44V
C797
0.22u
C798
0.22u R811
10k
2.7V
F 7 0 1
2.5A
R813
1k
Q708
LTC014EEBFS8
C778
1u 10
C779 100p
VoUT2
24
VoUT1
23
VIN1
22
1 7
VIN8
21
DEO
VoUT8
20 R796
C788
VoUT7
19
4.7u
0
18
D7 05
DI
EM Z6. 8 N
R79 7
0
19
D705,706
Line Protection
MIC/RX Selector(BINT)
I C7 13
TC7 W5 3 FK(F)
5
A
GND
4
6
CH1
VEE
3
7
CH0
INH
2
8
VCC
CoMMoN
1
C786
0.1u
MIC RX SEL
X57-824 5/10
Y
B-BUS
}
DC
Bias
J701
SP 2
20
DA TO
DATAI
D7 06
EM Z6 .8 N
/IGN
S P-
SP+
M I C
ME
B-BUS
71