L755 Fishfinder and correct transducer.

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Mike,

Due to the galvanic effects of dissimilar metals, it is not recommended that bronze thru-hulls be used on steel hull. Transducers constructed from stainless steel are the transducer of choice for steel hulls and even then, a degree of isolation must additionally be used to prevent galvanic corrosion. It would typically be recommended that Gemeco, Inc. (Airmar’s US distributor (803 693 0777)) be contacted for further information on this subject.

Please note that transducers designed for use with the L750 fishfinder would not have been compatible with the Raymarine fishfinding products which followed the L750 (i.e. the hsb/hsb2/SL Pathfinder Series Fishfinders such as the L755). It is also possible that attempts to use/modify the L750's transducer for use with an incompatible fishfinding product may result in damage to the fishfinding product and/or the transducer. Should the L755's fishfinder circuitry be operational, then it may be interfaced to one of the 600W or 1kW 50kHz / 200kHz transducers found here. Unfortunately, should the L755's fishfinder circuitry not be operational, then it would need to be replaced, as Raymarine's Product Repair Center can no longer service or provide parts for this generation of retired fishfinders.

Unfortunately, Raymarine does not support end-user repair of Raymarine product circuitry. Accordingly, product service manuals are not distributed by Raymarine to end users.

Should you be seeking a 7" display supporting 50kHz / 200kHz traditional sonar, then it would be recommended that you consider an Axiom 7 DV MFD, as these MFDs may be adapted to be mated to one of the 600W or 1kW 50kHz / 200kHz transducers found here.