Display Problems - Humminbird 786ci Operation Manual

Display Problems

There are several main conditions or sources of possible interference that may
cause problems with the quality of the information displayed on the control
head. Look in the following table for some symptoms of display problems and
possible solutions:
Problem
The control head loses
power at high speeds.
Possible Cause
If the power output of your boat's engine is unregulated,
the control head may be protecting itself using its
over-voltage protection feature. Make sure the input
voltage does not exceed 20 Volts.
116 Troubleshooting