Kenwood NX-300 Service Manual page 86

AY
NX-300
SCHEMATIC DIAGRAM
TX-RX UNIT : (X57-7370-XX) (A/2)
SWITCH UNIT
(X41-3710-10)
CN901
1
PTT
PTT GND 2
Side_G 3
SIDE 1
Side_1 4
Side_2 5
SIDE 2
86
X57-737 (A/2) 1/4
AZ
R590 10k
R589 10k
CN900
1 LED_G
C904 47p
2 /EMG
/PTT
C905 47p
3 LED_R
Side_G
C906 47p
Side_1
4 IFC
Side_2
C907 47p
5 /SAVE
C908 47p
6 I2CCK
7 /5TC
C910 47p
8 I2CSDA
9 SBC
C912 47p
10 /T_R
C914 47p
11 TV2
C915 47p
12 ASSIST
C916 47p
13 TV1
C917 47p
14 VAGC
C918 47p
15 5RC
C919 47p
16 TCXO_MOD
C920 47P
R431 0
17 GND
18 RSSI
C922 47p
R432 0
19 GND
20 CV
C923 47p
21 GND
R430
22 NC
0
23 NC
24 +B
25 +B
26 +B
C925
27 +B
47p
28 NC
29 NC
30 GND
31 /PTT
C926 47p
32 Side_G
C927 47p
33 Side_1
C928 47p
34 W_/N
C929 47p
35 SDO1
C930 47p
36 Side_2
C931 47p
37 /PCS_ RF
C932 47p
38 /DSW
C933 47p
39 APC
C934 47p
40 /APCSW
C935 47p
VCO_MOD
41
C936 47p
42 THP
C937 47p
43 PLD
C938 47p
44 38M
C939 47p
45 SCK1
C940 47p
46 GND
C941 47p
47 S_DET
R901
48 GND
0
49 NC
IF_DET
50
C942
R904
0
S
CN902
F900
2.5A
REVERSE
PROTECTION
BA BB
LED_G
R928
0
LED_R
IFC
1
/SAVE LED_G
I2CCK
/5TC
I2CSDA
LED_R
SBC
/T_R
5RC
TV2
TV1
VAGC
TCXO_MOD
4
R931
0
RSSI
VOLTAGE
REGULATOR(33C)
CV
D902
50T CONTROL
R : 3.27V
T : 62.3mV
D902
HSC119
R908
47k
R : 3.285V
T : 59.4mV
/PTT
Side_G
2
R : 4.977V
T : 5.038V
Side_1
50R
SWITCH
SDO1
R : 5.5mV
T : 4.81V
Side_2
T : 4.974V
/PCS_RF
/DSW
50IF
SWITCH
APC
/APCSW
R : 7.494V
VCO_MOD
T : 7.353V
SB3
PLD SWITCH
3
R : 5.1mV
T : 55.4mV
SCK1
Q904
DC/DC
CONVERTER
SWITCH
IF_DET
R : 7.23V
47p T : 7.06V
R907
10
4
L900
BC
TX/RX LED
TX/RX LED
SWITCH
R : 100mV
LG
T : 6.38mV
Q900
D900
UMG9N
R900
B30-2278-05
C901
390
470p R902
R903
C944 10
820
470p
R : 6.57V
LR
T : 79mV
VOLTAGE
R : 7.49V
IC902
REGULATOR(50C)
T : 7.26V
TK11250CUCB
R927
4 3
VIN CoNT /SAVE
1k
5 2
GND GND
6 1
VoUT NP
R : 4.97V
T : 5V
R : 3.80V R : 3.32V
IC903
T : 3.80V T : 3.35V
TK71733S
1 5
VIN VoUT
2
GND
3 4
oN/oFF NP/VREF
R929
SBC
1k R : 4.35mV
T : 4.99V
R : 4.974V
T : 4.987V
Q905
2SA1955A-F
IC900
TC75S51FE(F)
1 5
Q905
IN+ VDD
50T
2
SWITCH
VSS
R922
3 4 1k
R : 4.974V
IN- oUT
T : 4.25V
50T CONTROL
/5TC
R : 0.314V
Q902
T : 70mV
SSM6L05FU-F
R918
5RC
1k
R : 3.28V
Q903
T : 68.5mV
SSM6L05FU-F
R933
1k
R : 7.478V
Q901
T : 7.338V
SSM6L05FU-F
R913
1k
R : 3.276V
T : 3.331V
R : 14.28V
T : 14.32V
Q904
L901
SSM5H01TU-F
68u
IC901
XC9101D09AKR
1 8
EXT VSS
R909
2 7
LSEN VoUT/FB
0
3 6
VIN CC/GAIN
4 5
CE/SS CLK
DC/DC
CONVERTER
THP
1
50C
+B
33C
50T
2
50R
50IF
150C
3
4