Kenwood NX-300 Service Manual page 152

AY
NX-300
TX-RX UNIT : (X57-7370-11) (A/2)
SWITCH UNIT
(X41-3710-10)
CN901
PTT 1
PTT GND 2
Side_G 3
SIDE 1 Side_1 4
Side_2 5
SIDE 2
152
X57-737 (A/2) 1/4
AZ
SCHEMATIC DIAGRAM /
CN900
1 LED_G
2 /EMG
/PTT
3 LED_R
Side_G
Side_1
4 IFC
Side_2
5 /SAVE
6 I2CCK
7 /5TC
8 I2CSDA
9 SBC
10 /T_R
11 TV2
12 ASSIST
13 TV1
14 VAGC
15 5RC
16 TCXO_MOD
17 GND
18 RSSI
19 GND
20 CV
21 GND
22 NC
23 NC
24 +B
25 +B
26 +B
27 +B
28 NC
29 NC
30 GND
31 /PTT
32 Side_G
33 Side_1
34 W_/N
35 SDO1
36 Side_2
37 /PCS_ RF
38 /DSW
39 APC
40 /APCSW
VCO_MOD
41
42 THP
43 PLD
44 38M
45 SCK1
46 GND
47 S_DET
48 GND
49 NC
IF_DET
50
R904
S
CN902
F900
2.5A
REVERSE
PROTECTION
BA
原理图
R590 10k
R589 10k
LED_G
C904 47p
C905 47p
LED_R
C906 47p
IFC
C907 47p 1
/SAVE
C908 47p
I2CCK
/5TC
C910 47p
I2CSDA
SBC
C912 47p
/T_R
C914 47p
5RC
TV2
C915 47p
C916 47p
TV1
C917 47p
VAGC
C918 47p
C919 47p
TCXO_MOD
4
C920 47P
R431 0
RSSI
C922 47p
R432 0
VOLTAGE
REGULATOR(33C)
CV
C923 47p
R430
D902
0
50T CONTROL
HSC119
C925
47p
R : 3.285V
T : 59.4mV
/PTT
C926 47p
Side_G
2
C927 47p
Side_1
C928 47p
C929 47p
SDO1
C930 47p
Side_2
C931 47p
/PCS_RF
C932 47p
/DSW
C933 47p
APC
C934 47p
/APCSW
C935 47p
VCO_MOD
C936 47p
C937 47p
PLD
3
C938 47p
C939 47p
SCK1
C940 47p
Q904
DC/DC
C941 47p
CONVERTER
SWITCH
R901
0
IF_DET
C942
47p
R907
0
10
4
L900
BB
R928
0
TX/RX LED
TX/RX LED
SWITCH
R : 100mV
LG
T : 6.38mV
Q900
LED_G D900
UMG9N
R900
B30-2278-05
C901
390
470p
R903
C944
820
470p
R : 6.57V
LR
LED_R
T : 79mV
VOLTAGE
R : 7.49V
IC902
REGULATOR(50C)
T : 7.26V
TK11250CUCB
R927
4 3
VIN CoNT
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
R931
0
1 5
VIN VoUT
2
GND
3 4
oN/oFF NP/VREF
R929
1k
R : 4.35mV
T : 4.99V
R : 4.974V
T : 4.987V
Q905
2SA1955A-F
R : 3.27V
T : 62.3mV
IC900
TC75S51FE(F)
D902
1 5
Q905
IN+ VDD
50T
R908
2
SWITCH
VSS
R922
47k
1k
3 4
R : 4.974V
IN- oUT
T : 4.25V
50T CONTROL
R : 4.977V R : 0.314V
Q902
T : 5.038V T : 70mV
SSM6L05FU-F
R918
50R
SWITCH
1k
R : 5.5mV
T : 4.81V
Q903 R : 3.28V
T : 4.974V
T : 68.5mV
SSM6L05FU-F
R933
50IF
SWITCH
1k
R : 7.494V R : 7.478V
Q901
T : 7.353V T : 7.338V
SSM6L05FU-F
SB3
SWITCH
R : 3.276V
R : 5.1mV
T : 3.331V
T : 55.4mV
R : 14.28V
T : 14.32V
Q904
L901
SSM5H01TU-F
68u
IC901
R : 7.23V XC9101D09AKR
T : 7.06V
1 8
EXT VSS
R909
2 7
LSEN VoUT/FB
0
3 6
VIN CC/GAIN
4 5
CE/SS CLK
DC/DC
CONVERTER
BC
THP
1
50C
R902
10
+B
/SAVE
33C
SBC
50T
2
/5TC
50R
5RC
50IF
R913
1k
150C
3
4