Icom M120 Manual de servicio

Technical

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IC

M

Ml20

VHF MARINE TRANSCEIVER

MICMOD

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The original EM53 and EM56 microphones are no longer available.

The Ml20 can be modified to accept a replacement HM114 hand

microphone.

l-

Remove the 6 screws on hack of the Ml20 holding the case in place and slide

the case off

2-

Unplug the old mic from the MAIN board 5108 jack and remove

3-

Unplug coax connectors from

P501

and

P502

4-

Unplug interboard connectors

P402,

P503

and

P504

, remove 8 screws holding

board down, then flip board over front panel to gain access to circuit side

5-

Unsolder connector JlO8 (use extreme care to

avoid board damage),

then remove

6-

Replace J108 with a (#936-05432) connector

(make

sure pins align

I

for 1 etc), solder

7-

On bottom of MAIN board, jumper pin

#l

to pin

#7

on 5108

8-

Sleeve ends of a

4.7K

resistor

(#915-01171)

and install between pin 5 of

JlO8

and the T8 connector at point

“M”

9-

Reinstall MAIN board and all previously removed connectors and screws

lo-Thread

new mic cord into radio, snug mic cord restraint into notch on side of

chassis and plug intoJto8The small 2 pin connector on the HM114 is not needed.

Note: Up/Down buttons will notfunction on the new

mic.

1

..“.

r

i@

LJ

rm”“1

-&J

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i-1

II

II

I,

I

Cable

Connections

/\,I

,

,

add

4.7K

resistor

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