Kenwood NX-300S Service Manual page 79

AJ
CONTROL UNIT (X53-4432-75)
SP-
SP+
33A
2SJ243-A
MIC
MUTE
R843
1k
EXTSP+
EXTSP-
ME
+B
MM
16
19
16
15
21
23
IFADCN
18
9
13
AK
SCHEMATIC DIAGRAM
D18,19
SURGE
ABSORPTION
R846
470
MIC
MUTE
A
SW
A
Q707 3.32V Q5
2SJ347F
C797
1u
MIC
MUTE
CONTROL
A
Q4
SSM3K15TE(F)
D12-16
REVERSE
A A
CURRENT PREVENTION
D12
1SS416
VOLTAGE REGULATOR (50U)
A
A
A
Q411
LEVEL
CONVERTER
13
AL
CN23
AGND 14
A
6_/KEYI0 13
BL_SB 12
6_KEYO1
11
6_KEYO0 10
BL_SB 9
6_KEYO2 8
6_/KEYI1 7
L1
SP- 6
SP- 5
SP+ 4
A A
L2
SP+ 3
R40
EMC 2
0
ME 1
A
CN22 CN24
A
R29
1k
R28
1k
R30
100
R31
1k
D414
REVERSE CURRENT
5V
PREVENTION
R503 D414
10k 1SS416
R34
100
R502
10k
IC417
DUAL BUS
BUFFER
C453
0.01u
A
R500 A
47k
IC415
2 INPUT
AND
GATE
13
16
19
15
21
23
18
9
AM
NX-300(S)
SP
MIC
D20-23
SURGE
ABSORPTION
L4
L5
L6
L7
R32
100
L3
D17
SURGE
ABSORPTION
IC418
TC7WT125FUF
1 8
G1 VCC
2
7
A1
G2
3
6
Y2
Y1
4
5
GND
A2
REVERSE
C464
CURRENT
PREVENTION
0.01u
A
DUAL BUS
BUFFER
AN
A
CN405
1
SSW
2
SP+
3
SP-
4
MSW
5
EMC
6
ME
7
PTT
8
PF
9
OPT
L8
10
E
A
11
5V
R35
12
TXD
100
R33
13
RXD
100
14
NC
A
19
15
21
23
IFADCN
18
9
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