Kenwood NX-300 Service Manual page 81

Z
CONTROL UNIT (X53-4260-XX)
19
OPT10
20
23
RXEO
RXEI
OPT9
AI
14
OPT6
AO
TXO
15
23
16
21
IFADCN
18
9
13
AA
SCHEMATIC DIAGRAM
PLD
ASQDET
Q701
2SA1832(GR)F
C719
0.1u
OPT SW
A
R747
33k
ASQAPC
R739 C716
82k 680p
C723
0.1u
A
14 IC702
TC75W51FK(F)
APC LPF
APC/ASQ
SMF
R736 C713 R850
82k 3300p
R748
10k
14
AMT
R426
/SCSW
0
C726
RXAF SMF
0.1u
A
IC704
RX AF LPF
14
TC75S51FE(F)
1 5
IN+ VDD
2
VSS
C709 R738 R746
3 4
RXAF IN- oUT
1u 56k 56k
C725
180p
R753
C711 68k
0.1u
C715
0.1u
R735 R750 C727
BEEP
47k 10k 0.1u
A A A
C720 R754
0.01u 560k
C704
0.1u
R733 R742 C722 R755
TONE
47k 10k 0.01u 100k
14
A A A
R749
TONESW
Q702
4.7k
SSM3K15TE(F)
STSW
C705
0.1u C708
0.1u
15
23
AB
19
R790
1k
R798 100k
C755 47p
ASQ DET
A
IC711
TC75W51FK(F)
SQL BPF/
SQL DC AMP
C734 C804 C752 100p R799
1000p 47p 330k
C753 100p
A A
W/N
NOISE SW
Q703
SSM3K15TE(F)
0
A
20
SCSW(RXAF)
RF AF SW
IC707
TC7W53FK(F)
5 4
A GND
R766
6
3
CH1
VEE
7
0
CH0
2
8 INH
VCC 1
CoMMoN
C745
0.01u
A
R777
47k
R765
330k
22
R779
R768 47k
220k
SIDETONE MUTE
C731 R769
IC709
0.01u 330k
TC7W53FK(F)
C732 R770
1 8
CoMMoN VCC
2
0.01u 330k
INH 7
CH0
3
6
VEE
CH1
4 R797
5
GND
A
TONE SW
C746
0.01u
A
A
16
15
21
23
18
9
13
AC
NX-300
D702
R819
10k
MA2S111-F
PLD
CONTROL
R803
10k
NOISE
DETECTOR
D705
A
RB706F-40
R809 C771
330k 0.22u
C764
1000p
Q704
2SC4617(S)
A A
SQL
NOISE AMP
C777
IC713
TC75W51FK(F)
1000p
5 4
C761
IN+B VSS
10p
6 3 C778
IN-B IN+A
7 2
1u
oUTB IN-A
8 1
R818
VDD oUTA
100k
A:VREF
/B:RX SUM
C779
C756 R800
0.01u
0.1u 470k
1.65V REF/
RX SUMMING AMP
22
VGS REC SEL OPT SW
A
IC714
TC7W53FK(F)
1k
R805 R814
47k 560k
R806
47k
R807
1k
AD
19
R824
39k
A
20
22
14
TXO
A
22
16
15
21
23
IFADCN
18
9
13
81
X53-426 6/10