M
Ml20
VHF MARINE TRANSCEIVER
The original EM53 and EM56 microphones are no longer available.
The Ml20 can be modified to accept a replacement HM114 hand
microphone.
Remove the 6 screws on hack of the Ml20 holding the case in place and slide
the case off
Unplug the old mic from the MAIN board 5108 jack and remove
Unplug coax connectors from
and
Unplug interboard connectors
and
, remove 8 screws holding
board down, then flip board over front panel to gain access to circuit side
Unsolder connector
(use extreme care to
avoid board damage),
then remove
Replace
with a
connector
(make
sure pins align for 1 etc), solder
On bottom of MAIN board, jumper pin
to pin
on 5108
Sleeve ends of a
resistor
and install between pin 5 of
and the T8 connector at point
Reinstall MAIN board and all previously removed connectors and screws
new mic cord into radio, snug mic cord restraint into notch on side of
chassis and plug
small 2 pin connector on the HM114 is not needed.
Up/Down buttons will
on the new
