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Kenwood Manuals
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Nexedge NX-720HG
Service manual
Kenwood NX-720H(G) Service Manual page 75
Vhf digital transceiver
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:
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Instruction manual
(72 pages)
,
Instruction manual
(72 pages)
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Contents
Table of Contents
Troubleshooting
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AO
SCHEMATIC DIAGRAM
TX-RX UNIT (X57-8230-10)
THP1
R:0.03V
T:3.22V
Drive:2.6dBm
C101
L130
R103
C104
56n
0
1000p
1000p
DC Switch(50C)
Q106
EMD5
B-BUS
4.61V
R249
4.7k
4.60V
.
LNA
C251
R259
Q202
0
5p
NESG240034
SP+
SP-
MIC
ME
B-BUS
POWER
AP
25℃ : 2.6V
.
L105
L104
33n
L106
C119
C121
39n (-92)
27p
6p
TX Drive AMP
Q102
2SC3357-A
L103
Over Voltage
Protection
80T
Transient
Voltage
.
limiter
DA3S101F
R:0.0V
T(50W):2.7V
T(30W):2.2V
T(5W):1.5V
C254
L221
5.6n
12p
1.36V
f L:2.50V
fC:3.58V
fH:5.21V
AQ
NX-720H(G)/720H
TX Power Module
IC102
RA60H1317M1-123
R:13.6V
.
15dBm
T:13.0V(45W)
R122
.
.
(36dBm:5W)
22
C136
R123
L115
22
5T
470p
R:0.0V
T(50W):3.5V
T(30W):3.0V
T( 5W ):2.5V
3216
+B
80T
.
R138
.
10k
C145
.
OP AMP(APC)
0.1u
IC103
D102
NJM12904RB1
.
1
MP
R130
.
2
-
+
27k
R131
3
+
10k
4
.
C155
DC Switch
.
(H/L Power)
.
Q105
FK330301
R137
100k
R:(H:0.0V/L:3.3V)
T(50W/25W):0.0V
T(5W):3.3V
C258
C262
15p
1000p
AR
CN10
CN11
CN14
C15
CN12
CN13
.
D110
L407CDB
D110,111
C177
Antenna Switch
.
100p
D111
L407CDB
C178
100p
R:0.0V
T:1.6V
SideA
3216
R:0.0V
R:0.0V
T:7.8V
T:7.8V
D112-114
Over DC
Antenna Switch
Supply Protection
R:0.0V
8
T(50W):3.0V
T(30W):2.3V
7
.
T(5W):0.8V
-
6
R149
5
10k
470p
.
R141
33k
R:0V
C233
C231
T:0.79V
6p
6p
L232
L233
39n
39n
X57-823 9/10
AS
L116
3216
25℃ : 2.6V
SP+
SP-
MIC
ME
B-BUS
POWER
75
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