Schematic Diagram - Kenwood NX-720 Service Manual

A
TX-RX UNIT(X57-8230-1X)
1
+B
13.2V
BATTERY
-B
2
Discharge
3
4
5
Over DC
Supply
Protection
Reverse
Current Prevention
LTC014EEBFS8
6
7
X57-823 1/10
B

SCHEMATIC DIAGRAM

CN423
+B
Surge Reverse
Protection Current
Prevention
AVR(33M)
4.98V
R410
1
VIN
VoUT
4.7
5
2
VSS
DB2S310
3
CE
NC
4
IC401
XC6209B332M-G
2.3V
3.27V
.
IC402
XC6118C23CMR
4
VSEN VIN
3
VSS
2
5
CD VoUT
1
Voltage Detector(BINT)
3.26V
C417 100p
RX:6.56V
TX(25W):6.38V
Q403
TX(5W):6.49V MTM981400BF
8
1 7
2 6
3 5
4
DC Switch(SB)
D403,404
D403
RB520SM-30
Q418
LTC014EEBFS8
DC Switch(SB)
Q401
DC Switch
(Over DC Supply
R407
SBC2
Protection)
4.7k
3.30V
Digital GND .
R681 0
.
C648
R683
.
0.1u
.
0
R679
.
R682
0
R680
0
. .
0
R677 R678
0
0
.
C647
0.01u
D D
C
NX-720(G)/720
R:13.2V
T(25W):12.8V
DC/DC Converter(50M) D407
DC/DC
Converter(50M)
4
SHDN
FB
3
5
VIN
D407
GND
2
RB520SM-30
L404
6
SW
BooST
1
IC405
L405
LT1616ES6-PBF
22uH
D406
DC/DC
Converter
AVR(33A)
1
VIN
VoUT
5
2
VSS
3
CE
NC
D405
4
IC406
XC6209B332M-G
R411
3.31V
47k
.
F502
2.5A
DC Switch(50MC)
R423
4.7k
Q407
FK330301
R:4.59V
T:3.45V
XC6205B152P-G
R412 R413
10 10
AVR(33GPS)
R438
10
4.43V
13.2V
SB
IC1 RX:7.90V
AVR(80C)
TX:7.89V
TA7808F-NQ
DC Switch(80T)
1
.
IN OUT
2
Q404
R:0.0V
.
.
T:7.84V
Q402
F503
2SA1955A-F
. .
DC Switch(80ANT)
375mA
R419 Q405
LTC014EEBFS8
2.7k
DC Switch
(80ANT)
.
AVR(50C)
5.0V
IC404
XC6209B502P-G
RX:1.67V
TX(25W):1.61V
TX(5W):1.67V
DC Switch(50CS)
D
+B
CN422
5.02V
50M
CN421
R418 0
3.3V
33A
DC Switch(33A_2)
33A_2
4
3
5
2
33A_2
6
1
Q409
EM6M1
SBC2
50MC
4.99V
Q410
CN419
2SA1955A-F
DC Switch(50MC)
CN418
IC408
AVR(15M) AVR(15M)
15M
1.5V
CN417
D
33M
33GPS
33GPS
IC407 3.32V
NJM2878F4-33
SB
CN414
80C
2SA1955A-F 80T
80T
.
. R:0.0V
DC Switch(80T)
T:7.79V
R421
Q411
LTC014EEBFS8
4.7k
80ANT
.
R441 2.7k
80T
.
DC Switch(80ANT)
Q412
LTC014EEBFS8
50C
50C
.
DC Switch(50R)
50R R:4.75V
T:0.0V
Q417
EMD5
50R
.
CN411
4.89V
Q408
EMD5
50CS
3.3V
E
B-BUS
3.32V
R:0.0V
T:3.29V
R:3.29V
T:0.0V
R:3.3V
T:0.0V
67