Kenwood NEXEDGE NX-820, Руководство по обслуживанию

Страница: 109 / 127

109
SCHEMATIC DIAGRAM /
原理图
NX-820
X57-824 5/10
TX-RX UNIT (X57-8240-13)
U W V X Y
Q708,709
AF Mute Switch
Mute(MI2)
Q703,704
MIC AGC
Noise AMP
-t
MM2
SDO0
SCK0
50R
MM
TV2 TV1
MP
DI
/IGN /IGN
INAMT
PA
SPAF
PAAF
/EVCS
33A_2
33A_2
MRSW
VREF
.
J701
.
C801
47u
25
SSM3J15FS
.
Q706
2SA1832(GR)F
.
Q703
.
D704
DA3S101F
SSM3J15FS
.
Q705
2SC4738(GR)F
.
Q 7 0 4
KTC4075E(Y,GR)
.
Q702
.
D702
1SS422
.
TH701
ERTJ0EV104H
D 7 0 5
E M Z 6 . 8 N
D 7 0 6
E M Z 6 . 8 N
.
IC711
BU7462NUX
1
2
3
4
VSS
5
6
7
8
VDD
.
I C 7 1 3
T C 7 W 5 3 F K ( F )
1
CoMMoN
2
INH
3
VEE
4
GND
5
6
7
8
A
CH1
CH0
VCC
.
D701
DA2S101
CN701
.
IC712
R2A20178NP
1
VIN2
2
VDD
3
LD
4
CLK
5
DI
6
VIN3
7
VoUT3
8
VoUT4
9
VIN4
10 VIN5
11
VoUT5
12 VoUT6
13
VIN6
14
VDAREF1
15
VDAREF2
16
RESET
17
GND
VIN7
18
19
VoUT7
20
VoUT8
21
VIN8
22
VIN1
23
VoUT1
24
VoUT2
C803
16
330u
C804
330u
16
I C 7 1 4
1 2 3 4 5 6 7 8 9
10
OUT1 POWERGND OUT2 VCC FILTER P_P STB IN2 PREGND IN1
.
D703
DA3S101F
.
CP701
100X4
CN710
.
I C 7 0 3
B U 7 4 6 2 N U X
1 2 3 4
VSS
5 6 7 8
VDD
.
Q708
LTC014EEBFS8
.
C802
1000p
.
C796
1u
.
C782
0.1u
.
C766
4.7u
.
C753
0.1u
.
C752
0.1u
.
C767
4.7u
.
C774
0.1u
.
C765
22p
.
C770
0.1u
.
C738
0.1u
.
C740
1000p
.
C778
1u
10
.
C779 100p
.
C775
100p
C788
4.7u
.
C704
1u 10
.
C712
180p
.
C777
0.1u
.
C786
0.1u
.
C798
0.22u
.
C790
1 0 u 10
.
C791
10u 10
.
C739
1u
.
C741
0.22u
.
C744 0.22u
.
C735
10u
.
C797
0.22u
.
C784
10u
C805
1000p
.
C747
220p
.
C743
47p
.
C749
1000p
.
C806
1u
C811
1000p
.
C812
10u 10
.
C813
10u
.
C771
1200p
.
C780
100p
.
R818
3.3k
.
R813
1k
.
R787
1 2 k
.
R775
5.6k
.
R803
4.7k
.
R785
0 .
R777
10k
.
R806
1k
.
R804 4.7k
.
R805
1k
.
R800
100k
.
R816
12k
.
R778
27k
.
R769
680k
.
R739 330k
.
R749
100k
.
R750
39k
.
R752
390k
.
R755
220k
.
R710
56k
.
R705
68k
.
R703
56k
.
R786
56k
.
R801
1k
.
R820
2.2k
.
R814
390
.
R746
10k
.
R743
470
.
R741
47
.
R742 3.3k
.
R821
0
.
R819
2.2k
.
R823
12k
.
R796
0
.
R 7 9 7
0
R822
0
.
R745
100k
.
R756
1k
.
R751
100k
.
R748
100k
.
R824
3.3k
.
R831 68k
.
R832
68k
.
R833
100
.
R834
1k
.
R837
5.6k
.
R838
3.3k
R811
10k
.
R810
12k
.
C810
4.7u
.
C732
1000p
.
R845
100
.
C829
10u
.
C833
1000p
.
C832
1000p
.
R 8 4 6
22k
.
C830
0.1u
.
Q709
SSM6N37FE
.
C831 0.1u
.
R847
22k
.
F 7 0 1
MI1
MI2
ASQ
+ -
+ -
MIC SUM
RXAF SMF
RX SUM
MIC RX SEL
DEO
DI
+-
+
-
1 7
1 9
Mute(MI1)
MIC SUM AMP/
LPF(DI)
RX SUM AMP/LPF(RX AF)
D/A Converter
MIC/RX Selector(BINT)
Reverse
Current Prevention
Noise
Detector
D703,704
AF Detector
D705,706
Line Protection
S P 2
D A T O
D A T A I
M E
S P +
S P -
M I C
B-BUS
B-BUS
B-BUS
EXT.SP
2.5A
.
R799 MI2
20
AFO
.
R798
18
33A_2
B-BUS
DI
1.44V
1.44V
2.7V
DC
Bias
{
1.44V
1.44V
DC
Bias
}