Basic Troubleshooting - Furuno FCV-667 Operator's Manual

4.2

Basic Troubleshooting

The troubleshooting table below presents common problems and the means to restore normal
operation. If normal operation cannot be restored do not attempt to check inside the equipment.
neither echo nor fixed range scale appears
no echo but range scale shows
echo appears but no zero line
the equipment shows signs of low sensitivity
no water depth readout is shown
much noise or interference is present
speed/water temperature indication* is absent or
unrealistic
position indication* is absent or unrealistic
* Requires appropriate sensor.
Basic troubleshooting
If...
check battery voltage.
•
• check fuse.
check battery terminal for corrosion.
•
check that power cable is securely
•
plugged.
check if display speed is set to "0."
•
check if transducer plug is firmly
•
connected.
check if range shifting is set to "0."
•
check if gain setting is suitable.
•
• check for air bubbles or marine life
attached to transducer.
check if water is dirty.
•
bottom may be too soft to return proper
•
echo.
check if bottom echo is painted red or
•
reddish-brown.
• check if bottom is displayed.
• check if transducer/transducer cable is too
close to engine.
check unit ground.
•
check if there are other echo sounders of
•
the same frequency nearby.
check that sensor plug is securely
•
fastened.
check that sensor plug is securely
•
fastened.
check position-fixing equipment.
•
Then
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