Standard Horizon DS41 - Manual (Page 7)

DS41 Owner’s Manual 6
Troubleshooting
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 D41is firm and free of
corrosion.
Erratic readings while moored:
Check transducer for growth or multiple coats of paint.
Erratic readings while moving:
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.