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71
SCHEMATIC DIAGRAM
NX-420
X57-837 4/8
AD
AC
AB
AA
Z
D
D
D
SCK1
/PCS_RF
PCK_DSP
VOL
SBC
S-DET
ENC3
ENC4
ENC2
ENC1
38M
PCK_RF
/PCS_DSP
/PCS
+B
+B
33M
.
C515
6800p
R541
10k
R542
470k
R543
10k
C552
100p
.
R518
10k
.
R521
470k
.
R522
470k
FK330301
.
Q501
.
R514
470
.
C542
6800p
.
R513
33k
.
R512
68k
.
C534
56p
.
C532
10u
L506
15u
.
D503
HRB0502A
R536
470k
R534
470k
R527
100k
R528
100k
R529
100k
R535
470k
R530
100k
R533
470k
.
IC609
TC7SH08FU-F
1
2
3
INB
INA
GND
4
oUTY
5
VCC
.
C685
0.01u
IC506
XC61CC5602N-G
1
VoUT
2
VIN
4
3
VSS
NC
.
C537
0.01u
.
C549
4.7u
.
IC505
LT1616ES6-PBF
1
2
3
BooST
GND
FB
4
SHDN
5
VIN
6
SW
.
D502
1SS388F
.
C529
10u10
R538
470k
.
R504
2.2k
.
R506
0
.
C514
.
C517
100p
.
R510
10
.
L505
.
C527
1000p
.
C547
1000p
L504
2SJ648-A
.
Q500
.
C524
100p
.
C503
100p
.
C509
4.7u
.
L501
4.7u
.
C523
10u
.
C525
.
L502
1u
.
C531
.
C543
1000p
C539
1u
C530
1000p
C541
1000p
.
C535
1000p
.
D500
1SR154-400
.
F500
.
C540
1u
C533
0.22u
R511
1k
.
IC502
XC9235A15CM-G
1
VIN
2
VSS
3
CE/MoDE
4
VoUT
5 LX
.
C500
1000p
.
C511
6800p
.
L500
.
R654
0
.
C684
0.01u
.
IC608
TC7SH08FU-F
1
2
3
INB
INA
GND
4
oUTY
5
VCC
.
CN503
SB1
.
CN501
+B
.
C513
.
C518
.
C519
.
C520
100p
.
CP500
100kX4
.
C508
1u
C506
1u
.
C522
1u
.
R507
68k
IC500
NJM2878F4-33
1
2
CoNTRoL
GND
4
VIN
3
VoUT
C521
1u
.
IC501
NJM2878F4-33
1
CoNTRoL
2
GND
4
VIN
3
VoUT
L503
.
D501
1SS388F
C512
0.1u
XC6209B502P-G
.
IC504
1
2
3
NC
VSS
CE
4
VIN
5
VoUT
.
CN502
GND
.
R501
0
.
R516
390k
.
R517
150k
.
C551
10u
.
R505
2.2k
.
C516
100p
100p
100p
100p
100p
.
R508
2.2
.
C N 5 0 0
1
+B
2
SB1
3
NC
4
33A
5
VOL
6
VOL_GND
7
ENC3
8
GND
9
ENC4
10
ENC2
11
ENC1
.
R655
0
.
C536
100p
C510
100p
.
C526
1u
10u
.
L507
1u
.
R515
0
.
R523
1
.
R500
270k
.
R502
180k
IC503
NJM2878F4-33
1
2
CoNTRoL
GND
4
VIN
3
VoUT
.
CP501
1kX4
.
C501
22p
D506
DA3S103E
Q508
EMD12
Q507
FC694301
Q506
FC694301
+
-
S
S60-0443-05
R31-0665-05
15M
33M
33A
SB2
33M
VCO_MOD
PTT
50C
SBC
BATT
/BINT
/PSW
33C
50C
50C
50C
VCO_MOD
PTT
+B
33A
Li-ion
BATTERY
REVERSE
PROTECT
SPEED UP
DC/DC CONV
D502,D503
REVERSE
CURRENT
PREVENTION
AVR (33A)
AVR (33M)
AVR (15M)
AVR (33C)
AVR (50C)
DC/DC
CONV (38M)
RESET
AND GATE
AND GATE
DC SW (SB2)
Q500 CONT
LEVEL CONV
LEVEL CONV
SB1 CONT
2.5A
R:7.49V
T:7.39V
3.30V
R:7.50V
T:7.40V
7.5V
3.30V
7.50V
3.3V
4.97V
R:7.46V
T:7.36V
R:1.9
8
V
T:1.96V
3.
8
6V
3.30V
1.50V
TX-RX UNIT (X57-8370-10)
Summary of Contents for NX-420 K
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