Kenwood NX-800 Service Manual page 91

BN
TX-RX UNIT (X57-7390-10)
SB
/INAMT
50C
/INT25P
TC7WBD125AFK
1
oE1
2
I2CCK A1
3
I2CDT B2
4
GND
LEVEL SHIFT
9
(I2CCK/I2CDT)
50C
33M
RXD2
G_RXD2
AIO6,AIO7 9
50C
TC7SET08FU-F
1 INB
2 INA
TXD2
3
GND
BUFFERAMP (TXD2)
LINE
PROTECTION
25P_TXD2
13
DEO
DI
33M
RXD3
CTS0
50MC
RXD0
26P_RD
50M
9
RTS0
TXD0
R636
0
26P_TD
AFO
9
13
MI2
MI1
ME
BO
SCHEMATIC DIAGRAM
C591
0.01u
IC514
4.98V
8
VCC
7
oE2
6 19
B1 SCL
5 20
A2 SDA
21
VCC
4.98V
22
I/O
INT
EXPANDER
23
A1
24
A2
REVERSE
LINE
CURRENT
PROTECTION
PREVENTION
(RXD2)
(OR G RXD2)
R651
D506
1k
1SS416
R842
REVERSE
1k
D507
CURRENT
PREVENTION
1SS416
(OR RXD2)
IC513
5
VCC 4.98V
R644
4
oUTY
0
D508
DA204U
R650
0
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)
REVERSE
CURRENT
PREVENTION
5.01V
IC515
TC7WT126FU-F
1 G1 8
VCC
2 A1 7
3 Y2 G2 6
4 Y1 5
GND
A2
LEVEL SHIFT
(TXDO/RTSO)
BP
R662 470k
R663 470k
LINE
PROTECTION
(AID9)
12
P12
11
P11
10
IC517
P10
9
GND
8
P07
7
P06
R664 100k
R665 100k
R666 100k
R667 100k
R668 100k
R669 100k
12
9
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
9
BQ
NX-800
R825 C801 C802
10k 1u
0V
R823
DTC363EU
4.7k
Q709
DTC114EE
DC
SW
AO2
AO1
AIO9
AIO8
AIO7
12
BR
SB
R828
1u 0
Q710
AF
MUTE
PA
HOR
12
9
RXD2/DI
TXD2/AUXIO9
TXD0
RXD0
ME
MI2
DEO
DI/RTS
AFO
9
MI1
ME
X57-739 14/16