Hm-137 - Icom IC-M601 Service Manual

Vhf marine transceiver
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12-4 HM-137

PTT
S1
UP KEY
DOWN KEY : 3.0V
16/9 KEY
UP
R2
6.8k
S2
DOWN
R3
15k
S3
16/9
R4
33k
S4
MC1
W1
C2
C1
W2
R1
470p
470p
12k
R5
SP1
W3
15
W4
: 2.0V
: 3.8V
W1 (CHASSIS)
J1
7
1
6
8
2
5
3
4
HANGER
12 - 5

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