Need a circuit for humminbird 656

Hi!
Since your unit isn't listed in their owners manual section, you'll have to contact their support rep.

http://www.humminbird.com/support/Contact_Support.aspx

Hope this helps you out.

Please check the mount and the wiring throughly as its a loose contact issue nothing else.

If you have put power to the gps antenna then there is going to be a problem with your gps antenna. The Humminbird gps antenna gets it power from the unit. If you have done this you will need to contact our customer service group to get it resolved. There number is 800-633-1468.

Joby @ Humminbird

If you have someone that has the same or simular unit just slide there control head to the base just to make sure you have enough voltage and current to power the unit. If the other unit powers up then there is a problem with the control head. Then you will need to call customer service to get it resolved.

There should be an in-line fusible link on the power supply wire and it should be checked for a blown fuse. If there is no fuse protecting the head unit, it may have received a voltage spike internally and caused internal circuit damage, requiring replacement. What can be done is remove the head display unit and wire it (with a fuse link) to battery posts and see if it powers up. If the unit does not come on, then the head unit will need to be replaced.

The first thing you need to check is if you have sufficient power going to the fishfinder. Take a multimeter and measure the dc voltage going to the display when the unit is off and also on. If this is below 12 vdc this is your problem. You will need to check for loose connections and possibly replace your battery.

If the voltage is good then the problem lies within the display. Unfortunately, you would have to contact Humminbird directly to return the display for repair or purchase a new fishfinder.

Hi!
If the unit shuts off on its own, firstly check your power supply. I keep seeing customers running their ssounders from a small, portable battery configuration that doesn't put out the correct voltage...mostly seen with AA size batteries being rated at 1.2 or 1.3 volts (8 batteries times 1.2 volts is only 9.6 volts).
If the power supply is not the issue then I would say the internal power circuit is suspect...this can only be repaired by a competent repair person who knows how and what they are doing. If you open the unit up, you'll not only void the warranty, you run the risk of killing the entire unit from static shock.
Best of luck in your repair!
Mike

Hi!
here is a manula for your reference:
Humminbird 161
that should get you started :)

Best of luck
Mike

You guys will need to take the ounder to a Humminbird service center and have them check the poswer circuit. More times than nor we see blown circuits (usually easily fixable by a competent repair depot) because of no inline fuse or too large a fuse rating. Max should be 3 amps for this model.
Best of luck!
Mike

I've got the 565 and everything will be working fine and then the depth
finder or bottom of the lake goes to 6ft. Have to shut it off for an hour and it works for a wile but it always goes back to doing it
anything I can do?
Thanks Jeff