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Troubleshooting
Before contacting the Humminbird® Customer Resource Center, please read the
following section. Taking the time to review these troubleshooting guidelines may allow
you to solve a performance problem yourself, and therefore avoid sending your unit
back for repair.
300 Series™ Doesn’t Power Up
If your 300 Series™ Fishing System doesn’t power up, use the Installation Guide that also
comes with it for specific confirmation details, making sure that:
• The power cable is properly connected to the 300 Series™ Fishing System
control head.
• The power cable is wired correctly, with red to positive battery terminal and
black to negative terminal or ground.
• The fuse is operational.
• The battery voltage of the power connector is at least 10 Volts.
Correct any known problems, including removing corrosion from the battery terminals
or wiring, or actually replacing the battery if necessary.
300 Series™ Defaults to Simulator with a Transducer Attached
A connected and functioning transducer will cause the newly-started 300 Series™
Fishing System to go into Normal operating mode automatically. If, when you power up
the 300 Series™ Fishing System, it goes into Simulator mode automatically, even though
a transducer is already connected, this means that the control head is not detecting the
transducer. Perform the following troubleshooting tasks:
• Using the Installation Guide that also comes with your 300 Series™ Fishing
System, check to make sure that the transducer cable is securely connected to
the 300 Series™ Fishing System. Reconnect if necessary, and power up the 300
Series™ Fishing System again to see if this fixes the problem.
• Replace the non-functioning transducer with a known good transducer if
available and power up the control head again.
• Check the transducer cable. Replace the transducer if the cable is damaged
or corroded.