Icom IC-M402 Service Manual page 40

Vhf marine transceiver
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11-4 HM-129
MC1
MIC
S1
PTT
S2
UP
S3
DN
S4
16/9
C1
R1
470 P
12 k
W2
W1
R2
6.8 k
R3
15 k
UP_ON
2.0V
DN_ON
3.0V
16/9_ON 3.8V
R4
33 k
PTT
PTT
MICG
MICG
MIC
MIC
PTTG
GND
KEYM
GND
11 - 4
CHASSIS UNIT W1
1
2
to MAIN unit J4
3
4
1
to LOGIC board J3
2

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