Onwa KF-667 manual Basic Troubleshooting, Basic troubleshooting

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.

Basic troubleshooting

If	Then
Neither echo nor fixed range scale appears	check battery voltage.
	check fuse.
	check battery terminal for corrosion.
	check that power cable is securely
	plugged.
No echo but range scale shows	check if display speed is set to"0".
	check if transducer plug is firmly
	connected.
Echo appears but no zero line	check if range shifting is set to “0".
The equipment shows signs of low sensitivity	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.
No water depth readout is shown	check if bottom echo is painted red or
	reddish-brown.
	check if bottom is displayed.
Much noise or interference is present	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.
Water temperature indication*is	check that sensor plug is securely
absent or unrealistic	fastened.
Position indication*is absent or unrealistic	check that equipment plug is securely
	fastened.
	check position-fixing equipment.

*Requires external equipment

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