Sonar screen on my 797c2

Anything Related to the Humminbird 11xx, 9xx, 8xx, 7xx also known as CORE series Units
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Posts: 1
Joined: Mon Nov 24, 2008 8:01 pm
Location: Wheaton, Illinois

Sonar screen on my 797c2

Post by Sylvanboat » Sat Aug 20, 2016 8:23 am

I have a 797c2 I bought in 2007. It has worked flawlessly since then. Yesterday I went fishing and the sonar display on showed on the top 2/3s of the display screen - same for down imaging display. Also the depth display did not show deeper than 6 feet (and actual depth was much deeper)? Any ideas what I can do to fix this? Thanks.

Wayne P.
Posts: 1613
Joined: Sat Jun 05, 2010 5:24 pm

Re: Sonar screen on my 797c2

Post by Wayne P. » Sat Aug 20, 2016 8:22 pm

If you have a fully charged battery and good connections, I would guess you are witnessing the death of a sonar unit.

Just in chase:
Remove the display from the mount, very gently and very little, adjust the two power cord pins in any direction.
Do it so little you cannot tell you did. Those pins still have to line up with the tiny holes in the display receptacle--LOOK at them.
Use a pencil point.
Replace the display in the mount and check the operation.
Wayne Purdum
Charlottesville, Va.

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