Power: 16P0226 - Furuno Felcom 250 Service Manual

11.1 Communication unit: FB-2000

11.1.4 POWER: 16P0226

The POWER board is a switching regulator power supply which outputs 48 V for the PoE
power supply, 42 V for the Antenna power supply, 5 V for the digital circuit, and 6 V for
the analog / digital circuit.
If any of the voltages among the predefined 48 V, 42 V, or 5 V is dropped to the 70% or
less of the original level for approx. 2 second or longer for some reason, the shutdown
function would be activated to terminate the switching regulator circuit, and will maintain
that status until the power is re-activated.
Fig. 11.1.7 POWER board block diagram
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