Kenwood NX-820H Service Manual page 76

AT
NX-820H(G)/820H
L 117
L1 16
Over Voltage
Protection
D106
DZ2J 056( M )
C 165
47 0p
R 1 5 8
33k
D 108
RB520SM- 30
D109
RB520S M- 30
D108,109
Over DC Supply Protection
S P -
S P +
M I C
M E
B-BUS
76
X57-824 10/10
AU
X57-824X-XX C183 C184 C197 R1
0-10,0-11 NX-820H(G)/820H K 6.0p NO 7p 0
0-12,0-13 NX-820H(G)/820H K2 NO 7p 8p NO
COUP PL ER
For war d Po we r
R eve r se Po we r
D104,105
TX Power Detection
C158
f1 f2
R : 0V 0V
4 7 0p
T(45W):2.9V 2.7V
T(30W):2.6V 2.3V
T(5W):0.8V 0.8V
Reverse
Current Prevention
D103
R 1 5 2
1k RKS151KJ
AV
SCHEMATIC DIAGRAM
R2
NO
0
✽
R1
F1
✽
R2
F2
SB
SDO0
LCDCS
SCK0
BLC
MBL
BLED
5V_TXD2
C661
C N 5 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
R6 84
47 k
HOOK_RXD1
33M
Dual BUS Buffer
(HOOK/MKEY)
I C5 0 9
TC7WH126FU-F
Reverse
D5 0 2
R 61 5
Current
Prevention
4 .7 k
D B2 S3 10
R 61 3
10 k
MKEYI
POWER
AW AX
TX-RX UNIT (X57-8240-1X)
R171
0
CN514
1
C6 21
2
1 00 0 p
3
4
5
6
1 0 0 p
C620
7
C618 1 0 0 p
8
C617 1 0 0 p
9
CP 51 5
C616 1 0 0 p
10
C615 1 0 0 p
100X2
11
C614 1 0 0 p
12
13
14
15
C 61 3
BUS Buffer
IC 51 1
16
0 . 0 1u
TC74VHCT244AFK
17
18
C612 100p
C6 5 2
CP516
19
0.1u
C611 47p
20
C610 47p
21
100X4
C609 47p
R6 1 7
22
0
23
24
R6 1 6
25
4 7 0k
1 0 0p
C6 0 7
26
R6 1 4 0
27
C6 0 5 1 0 0p
28
1 0 00 p
C6 0 4
29
C6 0 3 1 0 0p
30
C 60 2 0 . 01 u
C6 5 1
0.1u
R610
4 70 k
C650
0.1u
ANT
S B
SB
SP-
SP-
SP+
SP+
B LC
M BL
R LE D
GLED
B LE D
GND
GN D
GND
E MG
GN D
N C
5 0 C
LC DDI
LC DCE
LC DCL
LC DDO
GND
GN D
MI C
ME
HOOK
PTT
MK EY
POW ER