Vexilar 107 Pro - Manual (Page 27)

Possible Cause
TROUBLE SHOOTING
Unit is turned on, but there is no
display. Battery voltage may be too low.
The unit will show no display if
the voltage is below 8.5 volts.
Unit will not turn on. Check for proper battery polar-
ity and that you have fully
charged, working batteries.
Unit runs well for a short time,
then the unit quits. Bad battery. Voltage may be
good when checked, but may
fall as it is loaded.
Unit runs and shows display
light, but does not read depth. Transducer is not plugged in or
not in contact with the water.
Unit works, but needs high gain
to see bottom or targets. Transducer is not aimed cor-
rectly or needs to be cleaned.
Unit works, but has too many
lines on the display. Can't tell
what is what. Many air bubbles or very small
targets in the water.
Unit works well when sitting
still or at slow trolling speeds,
but loses reading when the boat
speeds up. Improper transducer installation
or adjustment. There is a loss of
clear water flow across the face
of the transducer when the boat
reaches a certain speed.
Unit works, but shows noise
when the engine is started or the
electric trolling motor is turned
on. Improper ground or missing
ground in electrical system.
Defective engine or trolling
motor.
Unit does not save settings in
memory. Does not sound normal
beeps when turned on. Internal lithium battery is dead.
Replace with new. Common
number is CR2032.
Symptom
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