Kenwood NX-800 Service Manual page 90

BI
NX-800
TX-RX UNIT (X57-7390-10)
OPT10
11
2
VREF
VIN8
10
C745 R764
0.01u 120k
C749
0.1u
R756 R758 C747 R771
15k 10k 0.01u 100k
R769
4.7k
1
9
13
MI2
MI1
ME
X57-739 13/16
BJ
SCHEMATIC DIAGRAM
11
2
C776
1u
C777
1000p
DAC
R836
0
1.62V
33A-2
VREF
IC711
TC75W51FK(F)
1 8
VDD
7
1.62V
VREF
2
3
6
4
5
VSS
SUM AMP
(AF) / VREF
R790
220k
3.28V
IC710
TC7W53FK(F)
R776
330k
1
CoMMoN VCC
2
C752 R777
INH CH0
0.01u 150k 3
VEE CH1
4
C753 R778
GND A
0.01u 390k
AF SW
(AI TONE OPT9/VREF)
SIDE TONE MUTE
R782 R785 C775
15k 10k 0.1u
Q703
SSM3K15TE(F)
TONE SW
1
BK
1.62V
3.28V
1.62V
C789 4.7u
C790 10u
C813 10u
LINE
PROTECTION
(DI)
3.28V
1.62V
RX SUM
1.62V
3.28V
8
7
6
R792
5
1k
C785 R805
0.1u 82k
R791
LEVEL
560k
SHIFT (TXD)
9
13
BL BM
SDO0
SCK0
/EVCS
1
Q708
2SA1832(GR)F
C799
0.1u
OPT10
SW
R818
OPT10SEL
33k
R821
0
R822
100
D706 D707
EMZ6.8N EMZ6.8N
LINE
PROTECTION
(DEO)
9
R810
OPT6
1k
VGS REC SEL
IC713
TC7W53FK(F)
5 4
A GND
6 3
CH1 VEE
7 2
CH0 INH
C797
8 1
VCC CoMMoN AO
0.1u
AO SW
C788
0.1u
1
50C
AFO BEFF
IC714
TC75S51FE(F)
4.98V
1 IN+ 5
VDD
2
VSS
3 4
IN- oUT
C792 47p C798 R819
0.1u 0
R814
100k
9
1
/INAMT
DEO
DI
AFO
9
13
MI2
MI1
ME