20 Most Recent Northstar Explorer 657 Gps/Chartplotter/Sounder Combo With Tm Transducer Questions & Answers

It appears that the back-light, a Cold Cathode Fluorescent Tube about 3mm diameter, is not working. There are two likely causes. 1. Tube has failed. 2. High Voltage supply circuit has failed. I'm currently pulling my unit apart to determine the cause. I suspect the tube is the problem but I will post more when I have it apart Does anyone know what the correct operating voltage of this Cold Cathode Fluorescent Tube is? Northstar could not provide me with a service manual. The screws are 1/16" or similar Allan Screws (about 1.6mm internal between flats). They usually can be undone with a 1/16 Allan Key but some of the screws can't be unscrewed with this key. I'm having difficulties uploading the photos at the moment but I will try and fix that.

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If it is connected to the boat motor check the voltage that is coming from the engine and clean the battery post. This solved the screen flickering.

If you don't want to do that just call Northstar customer support and see what they suggest.
Phone (Toll-free) 1-800-628-4487 or (Direct) 603-324-2042
That will get you better support.

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The closest I could find was for the Navman 6000/6500 models. See the link below. Hopefully it'll be of some assistance. -Steve http://www.navmanmarine.net/upload/Marine/Internet_Manuals/6000/6500_MN000239A_eng_web.pdf

replace the gps receiver if its external if internal good luck

I had the same problem with my 657 I found it was moisture inside the unit that was causing the low voltage alarm to go off pull it apart and let it dry out inside

Hi!

I'm afraid your best bet here would be to contact the manufacturer directly. Here's the customer contact page:

http://www.northstarnav.com/en/Support/Contact-Northstar/

Hope is is helpful to you and good luck!

BACKLIGHT IS CACTUS

Is it connected to your boat motor if yes check your voltage from your engine and clean your baterry post, sometime you get what they call electrical sound that will disrupt a clean electrical wave for your system.

go to http://www.fileden.com/browser.php?action=setprofileimage you might have to join up , choose the free option.try right clicing on the pfd file and downloading it first

yes you can you need power lead and 12 volt battery