Kenwood NX-800 Service Manual page 142

BI
NX-800
OPT10
11
2
VREF
VIN8
33A-2
VREF
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
142
X57-775 (A/2) 13/16
BJ
SCHEMATIC DIAGRAM /
11
2
C776
1u
C777
1000p
3.28V
DAC
R836
0
1.62V
VREF
IC711
3.28V
TC75W51FK(F)
1 8
VDD
7
1.62V
2
R923
47k
3
6
4
5
VSS
SUM AMP
(AF) / VREF
R790
220k
3.28V
IC710
TC7W53FK(F)
R776
330k
1 8
CoMMoN VCC
2 7
C752 R777
INH CH0
0.01u 150k
3 6
VEE CH1
4 5
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
原理图
1.62V
1.62V
2SA1832(GR)F
OPT10
SW
C789 4.7u
C790 10u
C813 10u
LINE
PROTECTION
(DI)
1.62V
RX SUM
5
1.62V
6
7
8
3.28V
R792
1k
1
2
C785 R805
3
0.1u 82k
R791
LEVEL
560k
SHIFT (TXD)
9
13
BL
TX-RX UNIT (X57-7752-71) (A/2)
SDO0
SCK0
/EVCS
1
Q708
C799
0.1u
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)
4
A GND
3
CH1 VEE
2
CH0 INH
C797
1
VCC CoMMoN AO
0.1u
AO SW
C788
0.1u 1
50C
AFO BUFFER
IC714
TC75S51FE(F)
4.98V
IN+ 5
VDD
VSS
4
IN- oUT
C792 47p C798 R819
0.1u 0
R814
100k
9
1
BM
/INAMT
DEO
DI
AFO
9
13
MI2
MI1
ME