Kenwood NX-300 Service Manual page 91

BN
XC1-0130-XX L709 L710 L711 L713 L714
-10 K,K3 18n 18n 22n 8.2n 8.2n
-11 K2,K4 15n
15n 33n 10n 10n
XC1-0130-XX C665 C666 C667 C668 C669
2p 5p 2p 8p 0.75p
-10 K,K3
K2,K4 3p 8p 2.5p 10p NO
-11
TX-RX UNIT (XC1-0130-XX)
DRIVE AMP
R : 14mV
Q603
T : 2.81V (K,K3)
RD01MUS1-T113
2.32V (K2,K4)
TX
H : 2.80V (K,K3)
2.32V (K2,K4)
L : 1.96V (K,K3)
1.52V (K2,K4)
R634
0
50T
+B
IFC
R : 4.94V
T : 3.8mV
R742
4.7k
1st LO
R : 4.94V
T : 4mV
BPF
50R
R : 4.53V
T : 47mV
L708
560n
R740 R743
R : 1.29V
T : 43mV
47 680
RX
33C
RIPPLE
R : 14.28V FILTER
R : 13.65V
T : 14.32V
T : 13.72V
Q704
2SC5383-T111
R : 14.26V
RIPPLE T : 14.3V
FILTER
2
R : 0.31V (K,K3)
T : 1.63V
4
150C
Note : The components marked with a dot (
BO
SCHEMATIC DIAGRAM
L715 L720 L721 L722 L725 L726 L887 R644 R749
8.2n 10n 8.2n 8.2n 8.2n 33n 8.2n 27 180k
10n NO 10n 10n 6.8n 39n NO 22 220k
C692 C749 C751 C753 C754 C755 C756 C767 C770
39p 2p 10p 2p 3p 4p 9p 9p 4p
47p 4p 9p 4p 9p 5p 470p 12p 3p
RF FINAL AMP
R : 12mV
Q606
T : 2.34V (K,K3)
RD07MVS1BT122
2.10V (K2,K4)
C634
470p
R650
0
H : 2.33V (K,K3)
2.10V (K2,K4)
L : 1.63V (K,K3)
1.80V (K2,K4)
33C
R884
IFC
390
R882
∗ ∗
12
L709 L710
∗ ∗
C749 C753
CN702
R : 3.14V
T : 46mV
Q703
3SK318
R750 R752 C758
0 0 470p
R : 2.96V
MIXER T : 46mV
RF AGC
R : 137mV
Q706
T : 43mV
2SK1830F
R784
R : 3.8mV
T : 42mV
R780
0
DC AMP for BPF DC AMP for BPF
IC702
TLV2381ID8V
5
1 OUT 1
VDD
2
GND
3 4 3
IN+ IN-
R : 69.8mV (K,K3)
0.88V (K2,K4) 0.82V (K2,K4)
T : 1.633V
•
) are parts of layer 1.
BP
R757 R759 R760 R771 R785 R788 R790 R800 R885
100k 100k 100k 180 100k 100k 100k NO
150
1M 1M 1M 1M 1M 1M 0
C772 C773 C774 C776 C796 C798 C800 C804 C807
9p 1p 3p 9p 9p 1.5p 2p 9p
12p 1.5p 2p 12p 11p 3p 1.5p 11p
R : 0.5mV
T : 1.615V
Strip line
∗
L903 C660
6.8n
L881
LNA
IC881
L882
1 6
GND1 RFIN
8.2n
2 5
VCTL
GND2
C882
3 4
RFoUT VDD
2p
D702-704
VARI-CAP TUNE
∗
R753 C768 C773
0 1p
∗
R954
∗
∗
L720
R799 C795 C800
0 470p
R : 6.71V (K,K3)
7.25V (K2,K4)
T : 13.6V
470k
R786
0
RF AGC
R777
10k
IC703
TLV2381ID8V
5
OUT
VDD
GND
4
IN+ IN-
BQ
NX-300(G)
R950 R954 C609 C639 C647 C660 C662 C663
39p 22p 47p 1p 22p
NO 0 NO NO
1p 33p 4p 100p
0 NO 0 NO 100p
C809 C810 C811 C887 C888 C891 C975 C988
5p 18p 2p 9p 7p 0.75p 0.5p 6p 15p
3p 4p 7p 1p 0.5p NO 10p 27p
NO
ANTENNA SWITCH
D606 L612 L613 L614
∗
RN262CS C663 4T 4T 4T
∗ ∗ ∗
C665 C667 C609
D607
RN262CS
ANTENNA SWITCH
∗
R : -35mV
C809
T : 0.808V
∗
∗
L725
R800
∗
L887
L883
∗ ∗ ∗
C886 R885 C887 C888 C889
120p 1.5p
R768 R772
0 0
R : 4.89V
T : 47mV
R : 4.54V
RF AMP
T : 46mV
Q705
R765 C778 R770
3SK318
0 470p 68
R : 0.87V
T : 42.7mV
D706,708,710
VARI-CAP TUNE
∗ ∗
C807 C811
R : 6.71V (K,K3)
7.25V (K2,K4)
T : 13.6V
∗
R950
R961
0
BR
C664
1
4p
2.5p
C989 C992
10p 5p
15p NO
ANT
2
3
CN881
4
R : 1.99V
T : 45mV
5
R791
0
6
7
91
XC1-013 4/4