Kenwood NX-800 Service Manual page 78

A
NX-800
1
TX-RX UNIT (X57-7390-10)
R : 13.57V
T : 13.09V
CN401
CN402
2
3
XC6108C23CMN
4
VSEN
R : 3.62V
T : 3.50V
5
CD
VOLTAGE
DETECTOR (BINT)
/BINT
4
OVER DC
SUPPLY
PROTECTION
5
CN403
1 R401
2
1M
6
7
78
X57-739 1/16
B
SCHEMATIC DIAGRAM
L402
L403
SURGE REVERSE
ABSORPTION PROTECTION
VOLTAGE
REGULATOR (33M)
4.99V 3.32V
5.01V
XC6204B332M
1
VIN
2
VSS
3
CE
VOLTAGE
REGULATOR (33A)
IC401
3
VIN
2
VSS
1
VoUT
C415
470p
REVERSE
CURRENT
PREVENTION
0V
D403
R : 1.73V
Q401
T : 1.66V
1SS416
DTC114EE
Q402
1.88V
DTC114EE
0V
DC SW
(SB)
SW (OVER DC
SUPPLY
PROTECTION)
R408
10k
DC SW
(IGN)
Q403
DTC114TE
L406
68u
XC9101D09AKR
1
EXT
R436
2
LSEN
7.84V
0
R435
3
VIN
4
10
CE/SS
DC/DC
CONVERTER
(150C)
C
LT1616ES6-PBF
R : 13.57V
T : 13.07V
4
SHDN
L404
5
VIN
6
SW
IC405,D407,409
DC/DC
Converter (50M)
IC408
3.29V
Q416 3.29V
SSM6L05FU-F
5
VOUT
1.88V
4
NC
0V
D408
1SS301F
DC SW (50IF)
REVERSE
CURRENT
PREVENTION
(OR 33M/SBC 2)
Q405 3.31V
2SA1955A-F
DC SW
(SCTAM1)
UPA672T-A
0V
VOLTAGE
REGULATOR (80C)
IC403
R : 13.55V R : 8.03V
NJM78M08FA-ZB
T : 13.02V T : 7.97V
1 3
IN oUT
Q404 GND
2SJ645
2
DC SW
(SB)
D406
REVERSE
CURRENT
PREVENTION
(BLVL)
VOLTAGE
REGULATOR (50C)
IC404
TA7805FQ
1 2
IN oUT
GND
3
1
14.34V
R450
0
DC SW
IC410
8
VSS
7
VoUT/FB
C462
6
CC/GAIN
5
470p
CLK
D
IC405
3
FB
5.01V
2
GND
D409
1
BooST
1SS388F
L405
22uH
5.00V
Q412
3.89V
2SA1955A-F
DC SW
(50MC)
0V
Q410
SSM3K15TE(F)
DC SW
(50MC)
1.57V
VOLTAGE
REGULATOR (15M)
Q411
3.31V
2SA1955A-F
DC SW
(33BU) DC SW
(33BU)
Q406
2.97V
R422
D410
10k
0V
1SS388F
R : 0V
T : 7.96V
Q407
12A02CH
R423
DC SW (80T)
4.7k
R : 8.01V
T : 0V
Q408
12A02CH
R424
DC SW (80R)
4.7k
R : 0V
T : 8.01V
4.99V
DTC114EE
R : 4.96V
Q409
T : 0V
12A02CH
R425
DC SW (50R)
4.7k
R : 0V
T : 4.96V
IC406
3.30V
TK71733S
1 5
VIN VoUT
2
GND
3 4
oN/oFF NP/VREF
VOLTAGE
REGULATOR (33C)
IC407
3.28V
XC6204B332M
1 5
VIN VOUT
2
VSS
3 4
CE NC
VOLTAGE
REGULATOR (33GPS)
E
+B
50M
33A
33A_2
50MC
1.49V
15M
33M
SCTAM1
33BU
REVERSE
CURRENT
PREVENTION
(33BU)
REVERSE
CURRENT
PREVENTION
(BACK UP BATTERY)
BATT CHK
/BINT
/RST
SB
80C
1
80T
TXC
Q413
DTC114EE
80R
R : 8.01V
T : 0V
Q414
50C
50R
RXC
Q415
DTC114EE
33C
33GPS
150C 1