Mmu/Mmu Ii Indications - EMS Sky Connect Series Installation Manual

4.8.5 MMU/MMU II INDICATIONS

First the aircraft must be outside and have a clear 360 degree view of the sky.
Normal Start up procedure for the MMU after power on is to indicate a "MMU
Starting" message, this first step is a power on self test routine that will allow the
MMU to self test. MSet version, and the internal MMU software version will be
displayed.
If you never get past the MMU starting page, check the wiring between the
MMU and the transceiver to make sure it is wired correctly, and that the
wires are not open or shorted.
Next the MMU will communicate with the transceiver, and display the software
version of the transceiver, and the Iridium component internal to the transceiver,
should be Trkr 4.X and ISOX00X. This indicates that the MMU and the transceiver
can communicate.
Next the MMU displays "waiting system registation", at this point the transceiver is
attempting to register with the Iridium satellites, checking signal strength, and
activation of that SIM card.
If you never get past this message, the transceiver is not registering with the
satellites, this could be a wiring problem between the CSM module if installed, or a
problem with antenna or antenna coax. All coax connections should be checked, and
the coax itself should be tested for continuity, open and if possible a TDR for the
integrity of the coax.
Next the MMU should indicate "Ready" and display the signal strength.
Refer to the MMU and MMU II Operators Manual or the Pilot's Guide for further
operation instructions.
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1616-964-12
Date: 7/27/2011
Rev. 2.1