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Northstar Explorer D210 Installation and Operation Manual 11
No display:
1. Check DC power connections and DC
polarity with voltmeter.
2. Check fuse.
No depth reading (--) at all depths:
1. Check transducer for growth or multiple
coats of paint.
2. Check the transducer cable for cuts and
sharp bends.
3. Check that the transducer connection
behind the Explorer D210 is firm and free
of corrosion.
Erratic readings while moored:
1. Check transducer for growth or multiple
coats of paint.
Appendix B - Troubleshooting
Erratic readings while moving:
1. Cavitation (air) under the face of the
transducer. Review installation and
reinstall if necessary.
Erratic readings only while engine is running:
1. Re-route power and transducer cables
away from engine, ignition wires and
battery cables.
2. Add feed-through filter capacitor on the
positive terminal of the ignition coil.
3. Add an alternator whine filter to
alternator.
4. Replace spark plug wire with resistive
type.