45
Troubleshooting
If your unit is not working, or if you need technical help, please use the
following troubleshooting section before contacting the factory cus-
tomer service department. It may save you the trouble of returning
your unit for repair. For contact information, refer to the last page, just
inside the back cover of this manual.
Unit won't turn on:
1. Check the power cable's connection at the unit. Also check the wir-
ing.
2. Make certain the power cable is wired properly. The red wire con-
nects to the positive battery terminal, black to negative or ground.
3. Check the fuse.
4. Measure the battery voltage at the unit's power connector. It should
be at least 11 volts. If it isn't, the wiring to the unit is defective, the
battery terminals or wiring on the terminals are corroded, or the bat-
tery needs charging.
Unit turns on only in simulator mode:
There is a problem with the transducer or the transducer cable. Check
the cable for damage.
Unit freezes, locks up, or operates erratically:
1. Electrical noise from the boat's motor, trolling motor, or an accessory
may be interfering with the sonar unit. Rerouting the power and trans-
ducer cables away from other electrical wiring on the boat may help.
Route the sonar unit's power cable directly to the battery instead of
through a fuse block or ignition switch.
2. Inspect the transducer cable for breaks, cuts, or pinched wires.
3. Check both the transducer and power connectors. Make certain both
are securely plugged in to the unit.
Weak bottom echo, digital readings erratic, or no fish signals:
1. Make certain the transducer is pointing straight down. Clean the
face of the transducer. Oil, dirt and fuel can cause a film to form on the
transducer, reducing its effectiveness. If the transducer is mounted in-
side the hull, be sure it is shooting through only one layer of fiberglass
and that it is securely bonded to the hull. Do NOT use RTV silicone
rubber adhesive or Marine-Tex epoxy.
2. Electrical noise from the boat's motor can interfere with the sonar.
This causes the sonar to automatically increase its Discrimination or
noise rejection feature. This can cause the unit to eliminate weaker
signals such as fish or even structure from the display.
