Applies to: Furuno FELCOM15 · IC-215 · OME-56350-K4 · 2015-06-04 · IC-306 / PP-510
Work through these checks
Furuno FELCOM15 Inmarsat-C · OME-56350-K4
Match FELCOM15 terminal IC-215 and manual OME-56350-K4 (4 June 2015), not FELCOM16/IC-216. An IC-306 alarm can concern missing printer paper or GPS data as well as radio faults; record the exact message before acknowledging or changing anything. The optional PP-510’s POWER and ON LINE lamps concern printer readiness, not satellite login. Record SYNC/UNSYNC, login, GPS, date/position, BBER and Antenna Power Supply separately. NG antenna power can mean a cable discontinuity or short: qualified marine service is needed. Preserve logs and message disks; do not reset, format, rewire, change ocean region or try distress/PV/SSAS tests to diagnose.
When to stop and get help
Do not continue these checks in unsafe conditions. For immediate danger, use local emergency services and the device’s emergency instructions. Otherwise, contact your provider or a qualified technician.
What to tell support
Write down your exact model, service provider and on-screen message. Photograph the existing connections for your own reference before changing anything. Furuno FELCOM15 · IC-215 · OME-56350-K4 · 2015-06-04 · IC-306 / PP-510
Original troubleshooting guidance based on the official sources below. Menu names can change. This is an independent guide, not a manufacturer service bulletin or a bench-tested repair.