Chapter 3: Service & maintenance
50 Troubleshooting guide
DSC routine
testing
Check the DSC function regularly. Verify the
complete DSC installation, with antennas, by
transmitting a Safety Test call to another station
(coast or ship). The test call is generated using the
DSC call flow via menu CALL.
The call should normally be replied by the receiving
station without questioning. The default
configuration of a DSC VHF radio is auto-
acknowledgement of any received Safety test call
requests. If a ship is equipped with multiple radios a
second radio can be the station to check up against.
The transmitting radio will not receive its own
transmitted calls.
If there is only a single radio on a vessel, a facility is
built into the unit where the DSC engine can be
verified using a test call that is internally looped
without activating the radio transmitter PA. The test
is executed via menu SETUP, DSC SETUP. The call
sequence that is verified, is an Individual Safety Test
Call directed to own MMSI. The test status is read in
the display.
Missing
MMSI
DSC
operation is
not working
When powering up the VHF for the first time after
leaving factory there is no MMSI number in the VHF
radio. For the DSC operation to function the MMSI
number must be entered in the VHF radio. For
further details see the installation manual.
Wrong
MMSI
number
If a wrong number has been entered and stored, or
if there is a requirement to change it, contact your
authorized dealer.
Action Symptom Remedy
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