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  1. #1
    Join Date
    Mar 2007
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    Default MJ2325B table saw tripping circuit breaker

    My MJ2325B TS trips the powerboard circuit breaker each time I try to start it from a cold start. This has started happening over the last couple or weeks.Worked perfectly normal for about 5 years up until now.

    The saw will attempt to start and then trip the switch.. I wait a couple of minutes and try again and each time the saw will attempt to start and the blade will turn a little more each attempt I make until after a while, it will start up and run without any problem..

    Once it has had a run, even for a few seconds, it can be turned off and will start immediately each time. It only does this on the initial switching on the machine. after the initial start there is no problem.

    I have blown out all dust with compressed air and tried a new power board but it still does the same thing.
    Now I have discovered that if I turn the saw blade manually a few revolutions (power disconnected of course) and then plug it back into power and switch on, it fires up with no hesitation and can be restarted without any further problem until I leave it for a few hours and then it will do the same thing again. It's almost as though the blade is sticking but I don't see any indication of this,

    I am wondering if there are lubrication points on the motor so the blade turns more freely or could it be some other problem?

    Maybe someone else has had this experience and able to offer a solution..
    Reality is no background music.
    Cheers John

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  3. #2
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    Default

    John not good.

    I see you have blown out dust as much as possible.

    Have you checked plugs wiring for corrosion?
    Wires being Loose?

    Those areas could also be full of dust.

    Have you tried plugging straight into power not through a board which these days are all usually 10amp.

    Is your motor direct drive or belt? If you run the motor with out the belt hows it run?

  4. #3
    Join Date
    Aug 2007
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    Default

    I wonder if there is an electrical part of the motor on the way out (capacitor, centrifugal switch are the ones that come to mind)
    The other day I described to my daughter how to find something in the garage by saying "It's right near my big saw". A few minutes later she came back to ask: "Do you mean the black one, the green one, or the blue one?".

  5. #4
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    Quote Originally Posted by wheelinround View Post
    John not good.

    I see you have blown out dust as much as possible.

    Have you checked plugs wiring for corrosion?
    Wires being Loose?

    Those areas could also be full of dust.

    Have you tried plugging straight into power not through a board which these days are all usually 10amp.

    Is your motor direct drive or belt? If you run the motor with out the belt hows it run?
    Yes have tried direct into power socket and after I turn the blade manually, it fires up first time.
    No sign of corrosion and the motor runs without a hiccup once its started.

    I know the motor draws a lot of power on the initial start but has been working okay for around 5 years. 15amp motor but using 10amp outlet. but as I said, not problems until now.
    Reality is no background music.
    Cheers John

  6. #5
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    Hows the belt tension?

    Maybe new belt in order 5 years is long time John and you have been making lots of toys.

  7. #6
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    Highly likley that it is a capacitor on the way out also bearings may have collected some dust wich will make it slightly harder to turn then once you rotate it it is easier to turn then the cap can just start it
    Cheers Rod

  8. #7
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    Quote Originally Posted by wheelinround View Post
    Hows the belt tension?

    Maybe new belt in order 5 years is long time John and you have been making lots of toys.
    Worth checking out I reckon.
    Reality is no background music.
    Cheers John

  9. #8
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    Quote Originally Posted by nosnow View Post
    Highly likley that it is a capacitor on the way out also bearings may have collected some dust wich will make it slightly harder to turn then once you rotate it it is easier to turn then the cap can just start it
    Cheers Rod
    I was thinking along those lines myself.
    Reality is no background music.
    Cheers John

  10. #9
    Join Date
    Jan 2011
    Location
    Port Macquarie
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    Default

    I understand that as the wiring ages it can have a tiny amount of earth leakage which will trip the circuit breaker, but it is not a true "short". An old fashion fuse will allow it to work in this circumstance (but I'm not suggesting that you do this)
    The fix is to rewire the motor, if you can find someone who still offers this service, a new motor is nearly the same price.
    I am not a sparkie but had a table saw which did this

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