Kenwood NX-900 Service Manual page 91

AJ
TX-RX UNIT (X57-8060-10) (A/2)
13
/INAMT
Q708
2SA1832(GR)F
C799
0.1u
OPT10
SWITCH
R818
33k
C789 4.7u
C790 10u
C813 10u D706 D707
EMZ6.8N EMZ6.8N
LINE LINE
PROTECTION PROTECTION
(DI) (DEO)
R810
1k
VGS REC SEL
IC713
TC7W53FK(F)
5
A GND
6
CH1 VEE
7
CH0 INH
8
VCC CoMMoN
AO SWITCH
C788
0.1u
VREF
50C
AFO BEFF
LEVEL SHIFT
IC714
TC75S51FE(F)
1 IN+
2
VSS
3
IN-
C785 R805
0.1u 82k
C792 47p
R814
100k
9
MI2
1 2
MI1
ME
AK
SCHEMATIC DIAGRAM
SB
13
50C
/INT25P
I2CCK
I2CDT
9
50C
33M
13
RXD2
OPT10
G_RXD2
25P_TXD2
OPT10SEL
R821
0
R822
100
50C
9
TXD2
OPT6
4
3
2
C797
1
33M
AO
0.1u
9 9
33A_2
RXD3
CTS0
RXD0
5
50C
VDD
26P_RD
4
oUT
50M
50MC
RTS0
9
TXD0
R636
0
26P_TD
AL
R825 C801 C802
10k 1u 1u
Q710
R823
DTC363EU
4.7k AUDIO
MUTE
AF
Q709
SWITCH
MUTE
RT1N141U-T111
C591
0.01u
IC514
5.01V
TC7WBD125AFK
1 8
oE1 VCC
2 7
A1 oE2
3 6 19
B2 B1 SCL
4 5 20
GND A2 SDA
21
VCC
22
INT
23
A1
24
LEVEL SHIFT
A2
(I2CCK/I2CDT)
REVERSE
LINE
CURRENT
PROTECTION
PREVENTION
(RXD2)
(OR G_RXD2)
R651
D506
1k
1SS416
R842
REVERSE
1k
D507
CURRENT
PREVENTION
1SS416
(OR RXD2)
IC513
TC7SET08FU-F
1 INB 5
VCC
5.01V
2 INA
R644
3 4
GND
oUTY
0
BUFFERAMP (TXD2)
LINE D508
PROTECTION MC2850
IC516
TC7WH126FU-F
1 G1 8
VCC
2 A1 7
3.31V
3 Y2 G2 6
4 Y1 5
GND
A2
LEVEL SHIFT
(RXDO/CTSO)
D509,510
REVERSE
CURRENT
PREVENTION
5.02V
IC515
TC7WT126FU-F
1 G1 8
VCC
2 A1 7
3 Y2 G2 6
4 Y1 5
GND
A2
LEVEL SHIFT
(TXDO/RTSO)
9
1 2
AM
NX-900
R828
0
R662 470k
R663 470k
LINE
PROTECTION
(AID9)
12
Io1.2
11
Io1.1
IC517
10
PCA9535BS
Io1.0
9
I/O VSS
8
EXPANDER
Io0.7
7
Io0.6
R664 100k
R665 100k
R666 100k
R667 100k
R668 100k
R669 100k
12
R650
0
IC518
ADM202EARNZ
9 8
C614
R2oUT R2IN
1u
10 7
T2IN T2oUT
11 6
C615
T1IN V-
1u
12 5
R1oUT C2-
13 4
R1IN C2+
14 3
T1oUT C1-
15 2
C616
GND V+
1u
16 1
VCC C1+
C613
5.01V
1u
RS-232C
DRIVER
X57-806 (A/2) 8/14
AN
SB
PA
HOR
AO2
AO1
AIO9
AIO8
AIO7
12
12
RXD2/DI
TXD2/AUXIO9
TXD0
RXD0
ME
MI2
DEO
DI/RTS
AFO
9
1 2
MI1
ME
91