Kenwood NX-820H Service Manual page 75

AO
SCHEMATIC DIAGRAM
C124 C129 C133 C135
X57-824X-XX
0-10,0-11 NX-820H(G)/820H K 6p 6p
NO
0-12,0-13 NX-820H(G)/820H K2 7p 7p 220p 470p
TX-RX UNIT (X57-8240-1X)
THP1
TX Pre-Drive AMP
Q1 01
✽
C 109 R10 3
2S C335 6- A ( R24)
6p
L1 21
1 5n
DC Switch(50C)
Q 10 6
E MD5
B-BUS
f1:4.47V
f2:4.77V
C2 5 1
R2 18
0
S P -
S P +
M I C
ME
B-BUS
AP
C137 C142 C144 C175 C179 C180
C145 C148 C149 C150
2p 3p 5p
NO NO NO NO NO 22p
NO NO
100p 470p 100p 0.1u 100p 470p 1u 6p 4p 6p
E2 3 - 1 2 7 8 - 0 5
C N 1 4 C N1 0
C N 1 5 C N1 2
C 1 0 4 TX Drive AMP
Q1 0 2
✽
47 0 p
2S C33 5 7- A C1 1 9 R 1 8 8
6 p
K:4.2dBm
K2:1.4dBm
L 1 0 3
80T
Transient
✽
Voltage limiter
f1:4.75V
f2:4.78V
C N 2 0 5
LNA
Q 2 0 2
NE SG2 4 00 34
✽
✽ C 2 5 4
C2 6 3 R2 90
7 p
0
f1:1.55V
f2:1.53V
D204,206
RX BPF Tune
K K2
fL:2.71V 1.52V
fC:6.25V 5.41V
fH:9.36V 8.92V
AQ
NX-820H(G)/820H
C254 C255 C256 C263 C290 C292 C296
CN13 D102
5p 2p 22p 7p 2p 10p 100p
E23-1278-05 NO
18p 10p 18p
4p NO 3p 8p NO DA3S101F
2.6V:25
TX Power Module
TH1 I C1 0 2
CN 1 1
✽C N1 3
13dBm
R1 2 2
12
L 1 0 6
C1 3 6
R1 2 3
1 8 n
1 2
47 0 p
R:13.6V
T:12.9V(45W)
+B
80T
R 13 8 1 0 k
✽
C1 4 5
I C 10 3
NJM12904RB1
D 1 0 2
1
✽
MP
R1 30
2
- +
R 13 1
3
+
1 0k
K K2 4 GND
R :0.0V 0.0V
T(45W):2.5V 2.4V
T(30W):2.2V 2.1V
C155
T(5W):1.5V 1.5V
OP AMP(APC)
R:0.0V
T(45W/30W):0.0V
T(5W)3.3V
R 1 3 7
1 0 0k
Q1 05
FK 33 0 3 01
C N2 0 3
C N2 04 C N2 06
✽
C2 91 C 2 89 C2 97 C2 96
2 p 1 00 p 1 0 0p
AR
L210 L213 L215 L228 R102 R103 R104 R130 R184 R185
68n 18n 27n 18n 470 12 470 820 820
NO
82n 22n 33n 2.7n 220 22 220 15K 470 470
D110,111
K K2
Antenna Switch
R:0.0V R:0.0V
T(45W):3.1V T(45W):3.3V
D1 1 0
T(30W):2.5 T(30W):2.9V
T(5W):2.1V T(5W):2.3V
L 40 7 CD B
(32dBm:Lo-Pow)
D1 11
L 1 15
L4 0 7C DB
R:0.0V
T:1.6V
R:0.0V
T:7.8V
R:0.0V
T:7.8V
TH2
V+
8
7
-
6
R1 49
5
10 k
470p
R 14 1
D112-114
3 3 k
Over DC
Supply Protection
DC Switch
Antenna Switch
(H/L Power)
B-BUS
R: 0V
T:0.80V
✽
L 2 2 8
Front RX
✽
R 291
✽
R 2 92
AS
R188 R291 R292
5.6 0 0
12 NO NO
C1 7 7
1 0 0 p
2.6V:25
SP -
S P +
M I C
M E
B-BUS
75
X57-824 9/10