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44 Transducers for Fishfinders
• In order to minimize these effects and enable you to get the best
possible performance from your Raymarine equipment, guide-
lines are given in the installation instructions, to enable you to
ensure minimum interaction between different items of equip-
ment, i.e., ensure optimum Electromagnetic Compatibility
(EMC).
• Always report any EMC-related problem to your nearest Rayma-
rine dealer. We use such information to improve our quality stan-
dards.
• In some installations, it may not be possible to prevent the equip-
ment from being affected by external influences. In general this
will not damage the equipment but it can lead to spurious resetting
action, or momentarily may result in faulty operation.
Problem Solving
Common Problems and Their Solutions
Table 3-1: Common Transducer Problems
Problem Correction
Fishfinder display
“freezes” Check the transducer cable for damage. If dam-
aged, the cable and transducer must be replaced
as a unit.
Fishfinder does
not see bottom or
fish 1. If you have a transom-mount transducer, check
that the transducer hasn’t kicked-up on hitting an
object.
2. Check that the transducer is within 10° of verti-
cal.
3. Check that the transducer face is not covered or
fouled. If necessary clean the transducer.
Fishfinder does
not display fish Ensure the transducer is within 10 ° of vertical.
Fishfinder is unre-
liable at high boat
speeds Turbulence around the transducer may be confus-
ing the unit.
Fishfinder displays
a lot of back-
ground noise Check that the transducer is mounted correctly
and is clean.
Fishfinder speed
or log readings are
wrong Check that the transducer paddle wheel is clean.