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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:
1-Year Limited Warranty
We warrant the original retail purchaser that products made by
Humminbird® have been manufactured free from defects in materials and
workmanship. This warranty is effective for one year from the date of original
retail purchase. Humminbird® products found to be defective and covered by
this warranty will be replaced or repaired free of charge at Humminbird’s
option and returned to the customer freight prepaid. Humminbird’s sole
responsibility under this warranty is limited to the repair or replacement of a
product that has been deemed defective by Humminbird®. Humminbird® is
not responsible for charges connected with the removal of such product or
reinstallation of replaced or repaired parts.
This warranty does not apply to a product that has been:
• Improperly installed;
• Used in an installation other than that recommended in the product
installation and operation instructions;
• Damaged or has failed because of an accident or abnormal
operation;
• Repaired or modified by entities other than Humminbird®.
Please retain your original receipt as a proof of the purchase date. This will
be required for in-warranty service.
Possible Source of Noise Isolation
Other electronic devices
The boat’s engine
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 cable
away from the engine wiring.
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