Icom M120 Manual de servicio
Technical
Bulletin
0
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
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LJ
rm”“1
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i-1
II
II
I,
I
Cable
Connections
/\,I
,
,
add
4.7K
resistor
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