Fuse inside of Northstar 951/952

Discussion in 'Marine Electrical / Electronics' started by steveinak, Jul 3, 2019.

  1. steveinak

    steveinak Captain

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    Anybody ever open up one of these to check the inside fuse ?
     
  2. Old Mud

    Old Mud Captain

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    Steve, Not holding a memory ?
     
  3. steveinak

    steveinak Captain

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    952 unit it won't power up at all, i checked the power cord pins and they get juice so i'm wondering if its the internal fuse. Ebay unit that was untested by seller but supposedly worked when taken off boat. Seller did make good on it but you know me i gots to open it up and fix it ! I also have a 951 that plays and locks in but can't get the date to change so i bet that one needs a software update, i have the cord to do that. Just going to use the 951 for loran numbers. one other thing i need a boat to stick all this old shit (including me) on !
     
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  4. Old Mud

    Old Mud Captain

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    .Well im glad you know ("Old shit") still works. Has the 952 got an external fuse ? Yep i do that also ,use to be from necessity now more just for the f of it.
     
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  5. the_Bartender

    the_Bartender Senior Member

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    I don't know about any fuse inside but you can probably find the schematics online. Try Manualslib. Here is what a quick google search brought up:

    Northstar 951 - Free Pdf Manuals Download

    But when I've encountered machines, computers, lorans, gps, etc. that lose memory upon shutdown it is because of the CMOS BATTERY. Which makes sense since the machine is old and the cmos battery has lost its charge. (I know the feeling).

    Just a thought, I hope it helps.
     
  6. the_Bartender

    the_Bartender Senior Member

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  7. steveinak

    steveinak Captain

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    checked the external fuse looked ok. I'll mess more with them once it cools down around here, hit 91 here today and i'm just about dead from the heat.
     
  8. steveinak

    steveinak Captain

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  9. Old Mud

    Old Mud Captain

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    You know the only way to see the guts just like i do. :)

    When you yarn her down i would check the switch first the start on the power supply and work back/ forward.
     
  10. the_Bartender

    the_Bartender Senior Member

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    Well, I'm bored so I was taking a further look into your internal fuse question. I haven't found anything specific but I did find this about a more recent northstar machine. I think it is worth looking at and may be applicable to your situation. I've notice that companies tend to reuse ideas model after model. I'm just throwing this out there. It is up to you to see if these pins are available and if it is worth the risk.

    upload_2019-7-5_10-51-48.png

    Otherwise, why don't you go ahead and open it up? It sounds like you've been there before.

    This is the manual for this 8700 unit:
    Technical Specifications - Northstar 8700 Technical Reference Manual [Page 30]
     
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  11. steveinak

    steveinak Captain

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    i'll open it up again and start looking closer but i don't have the balls to be powering up those pins !
     
  12. the_Bartender

    the_Bartender Senior Member

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    I understand about the pins! My next move would be to open it up and start tracing circuits for continuity from the plug with a voltage, ohm meter. The internal fuse is more than likely one of the first components you'll encounter. While you are inside you might check the CMOS BATTERY, from what I found it will look like this.
    tl-513 battery - Google Search:

    I still can't find any schematics for this machine. I am assuming there was not any on the inside cover. Northstar probably won't release them because if they did anyone could fix their machines!
    If I have anymore brain farts I will let you know. Good Luck!
     
  13. Drifter

    Drifter Member

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    I know they often had power button problems
     
  14. Capt. Rick

    Capt. Rick Senior Member

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    Bartender may be on to something.... these units do have an internal battery that you are supposed to change periodically - if lucky they may last 10yr. Not sure if this is your problem or not, but could be it.
     
  15. steveinak

    steveinak Captain

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    i think 1st thing to do will be to update the 951's software so it knows its not 1999 anymore then i can worry about the battery. The 952 doesn't power up at all so that might be the power button ?? i'd still like to find the fuse inside it though.
     
  16. TCL

    TCL Senior Member

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    I had a 951 on my previous boat. I had a problem where it would not be able to pick up satellites. I took it to an electronics guy who updated the software, it worked fine after that.
     
    TCL,
  17. Ditchdigger

    Ditchdigger Captain

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    Steve, it is an old model. You know how it is these days. Just throw it in the garbage, and get a new one. The new shit is Soooooo much better. It is Hi-tech !! Get one of them new fangled units, that does so much more for so much more $.
    Some wise man told me not to long ago, "you can't take all that hard earned money to your grave" . He told me to just go ahead and get it.
    It is the search, that is more fun than the end result in my opinion. I have a brother that always told me that " I don't care how broke it is, I can fix it". It is the challenge that he thrives on. You are one of those guys.
    Go find a boat to put this antique in !
     
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  18. steveinak

    steveinak Captain

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    problem with the new stuff is i don't know how to use it ! I've had those northstars since the 951's came out so i can just about work them blindfolded. Thats right "never seen a Brinks truck following a hearse". I like jimmy's thinking about fixing stuff. I'm going to find a nice antique BHM to put all my broken northstars on !! There has to one covered up and hiding somewhere ?
     
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