Kenwood NX-800 Service Manual page 143

BN
TX-RX UNIT (X57-7752-71) (A/2)
SB
/INAMT
50C
/INT25P
TC7WBD125AFK
1
2
I2CCK
3
I2CDT
4
9
50C
33M
RXD2
G_RXD2
AIO6,AIO7 9
50C
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
oE1 VCC
7
A1 oE2
6 19
B2 B1 SCL
5 20
GND A2 SDA
21
4.98V 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
5
VCC 4.98V
R644
4
oUTY
0
D508
DA204U
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
(AIO9)
12
P12
11
IC517
P11
PCA9535RGE 10
P10
9
I/O
GND
EXPANDER
8
P07
7
P06
R664 100k
R665 100k
R666 100k
R667 100k
R668 100k
R669 100k
12
9
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
RS-232C 1u
DRIVER
9
BQ
NX-800
原理图
R825 C801
10k 1u
0V
R823
4.7k
Q709
RT1N141U-T111
DC
SW
AO2
AO1
AIO9
AIO8
AIO7
12
X57-775 (A/2) 14/16
BR
SB
C802 R828
1u 0
Q710
DTC363EU
AF
MUTE
PA
HOR
12
9
RXD2/DI
TXD2/AUXIO9
TXD0
RXD0
ME
MI2
DEO
DI/RTS
AFO
9
MI1
ME
143