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POSEIDON M28 USER MANUAL
The difference between “NC” (“no circuit”) and “UN” (“unknown”) depends on
whether the mouthpiece is reporting that neither closed-circuit nor open-circuit
is currently established (“no circuit”), or whether the mouthpiece is not reporting
any position information at all (“unknown”). In the former case, the problem is
likely due to the mouthpiece switch being in the wrong position, one or both of
the magnets inside the mouthpiece being damaged or corrupted, or a problem
with the magnet sensors in the HUD. The latter case would arise if the HUD
was unable to communicate reliably with the M28 or report that the mouthpiece
is in both open and closed position at the same time. In any case, if the
displayed value of the mouthpiece position is not what it should be, rst check
the actual position of the mouthpiece, make sure it is rmly and completely in
one position or the other and attempt to wiggle the HUD slightly.
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