Humminbird 700 SERIES 786CI - Manual (Page 125)

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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 Possible Cause
The control head loses
power at high speeds. 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.
Troubleshooting