Kenwood NX-300 Service Manual page 83

AJ
CONTROL UNIT (X53-4260-XX)
SP-
SP+
33A
Q707
2SJ243-A
MIC
MUTE
R843
1k
D12-16
EXTSP+
EXTSP-
ME
9
+B
MM
9 16
19
16
15
21
23
IFADCN
18
Side_1,Side_2,Side_G
9
13
AK
SCHEMATIC DIAGRAM
9
D18,19
SURGE
ABSORPTION
R846
470
MIC
MUTE
A
SW
A
3.32V
Q5
2SJ347F
C797
1u
MIC
MUTE
CONTROL
A
Q4
SSM3K15TE(F)
REVERSE
A A
CURRENT PREVENTION
D12
1SS416
VOLTAGE REGULATOR (50U)
A
A
A
Q411
LEVEL
CONVERTER
13
AL
CN23
AGND 14
A
R20 1k
6_/KEYI0 13
6_/KEYI0
R21 1.2k
BL_SB 12
BL_SB
R22 1k
6_KEYO1 11
6_KEYO1
R23 1k
6_KEYO0 10
6_KEYO0
R25 1.2k
BL_SB 9
R24 1k
6_KEYO2 8
6_KEYO2
R26 1k
6_/KEYI1 7
6_/KEYI1
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
5V REVERSE CURRENT
PREVENTION
D414
R503
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
SWITCH UNIT (X41-3720-10)
6KEY
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
83
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