Kenwood NX-820 Service Manual page 114

AT
NX-820
.
L1 17
L1 16
Over Voltage
Protection
D 106
DZ2J0 56( M)
C 165
4 70p
R158
33k
D 108
RB520SM- 30
D109
RB520S M- 30
D108,109
Over DC Supply Protection
S P -
S P +
M IC
M E
B-BUS
114
X57-824 10/10
AU
SCHEMATIC DIAGRAM / 原理图
COUP PL ER
For wa rd Po we r
Rever se P o we r
D104,105
TX Power Detection
C158
4 7 0p
R : 0V
T(25W) : 2.1V
T(5W) : 0.8V
Reverse
Current Prevention
D103
R152
1k RKS151KJ
AV
.
R 2
0
SB
SDO0
LCDCS
SCK0
BLC
MBL
BLED
5V_TXD2
.
C661
C N5 3 0
4 7 p
5V_TXD2
EMG
50C
GLED
RLED
TXD2
SDI0
BUCNT1
TXD1
.
Dual BUS Buffer
IC716
TC7WT126FU-F
MKEYO
BUCNT2
Reverse
Current Prevention
/PTT .
D5 1 1
D B2 S3 1 0
.
R 6 8 4
4 7 k
HOOK_RXD1
33M
Dual BUS Buffer
.
(HOOK/MKEY)
IC 50 9
TC7WH126FU-F
.
.
Reverse
D 5 02
R 6 1 5
.
Current
Prevention
4.7k
D B2S 31 0
R6 1 3
1 0 k
MKEYI
POWER
AW AX
TX-RX UNIT (X57-8240-13)
R171
0
.
CN514
.
1
C 6 2 1
2
1 00 0 p
3
4
5
.
6
1 0 0 p
C620
.
7
C618 1 0 0 p
.
8
C617 10 0 p
.
.
9
C P 5 1 5
C616 1 0 0 p
.
10
C615 1 0 0 p
100X2
.
11
C614 1 0 0 p
12
13
14
.
15
.
C6 1 3
BUS Buffer
IC511
16
0.01u
TC74VHCT244AFK
17
.
18
.
.
C612 100p
C 6 5 2 .
CP516
19
0 . 1u
C611 47p
.
20
C610 47p
.
21
100X4
.
C609 47p
R 61 7
22
0
23
24
.
R 6 1 6
.
25
4 7 0k
1 00 p
C6 0 7
.
26
R6 1 4 0
.
27
C6 0 5 1 00 p
.
28
1 00 0 p
C6 0 4
.
29
C6 0 3 1 00 p
.
30
C6 02 0.01u
.
C 65 1
0 . 1u
.
R610
.
4 7 0 k
C650
0. 1 u
ANT
SB
SB
S P -
S P -
S P +
S P +
BL C
M BL
RL ED
G L E D
B L E D
GND
GND
GND
EM G
GND
NC
5 0C
L CD DI
L CD CE
L CD CL
L CD DO
GND
GND
M I C
ME
HOOK
PTT
M KEY
POW ER