Cannon Mag 20 Dt/Hs Guía de instalación descargar pdf (Pagina 25)

Finding the Cause of Noise

Electrical noise usually affects the display with many black dots at high speeds, and high sensitivity readings. One or more of the following sources can cause

noise or interference:

Possible Source of Noise Isolation

Turn off any nearby electronic devices to see if the problem goes away, then turn them on one at a time to

see if the noise re-appears.

To determine whether the boat’s engine is the source of the noise, increase the RPMs while the boat is in

neutral and stationary to see if the noise increases proportionately; if noise appears when you rev the

engine, the problem could be the spark plugs, alternator, or tachometer wiring. Replace the spark plugs with

resistor plugs, install an alternator filter, or route the control head power and transducer cables away from

the engine wiring.

Turbulence created by the propeller can cause noise; make sure the transducer is mounted at least 15” (38

cm) from the propeller, and that the water flows smoothly over the face of the transducer at all times.

Other electronic devices

The boat’s engine

Cavitation from the boat’s propeller

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Cannon Mag 20 Dt/Hs Guía de instalación Pagina 25

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