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    i have a chassis with mk-70's that keeps tripping the master cb on the mechanics control panel. table contacts chatter then the cb trips.
    i have checked the following:
    looked for shorts
    unhooked sweep and table contactors
    m and m2 relays

    if i pull the f1 fuse or the m2 relay the cb will not trip

    any ideas ??????
    jim k.
    jim k.

  • #2

    I mentioned this fix in another thread (a fix I found in an old thread here). Since you have MK-70's the 3 capacitors in the chassis itself are bypassed but a bad diode underneath can still cause this problem. Clip the diode under CP3 in the chassis and toss it. I was rebuilding old chassis over the summer that haven't worked since I started there almost 7 years ago. One of our bad ones was blowing the low voltage breaker on the control panel and this fixed it. I believe CP3 is the one closest to the front of the chassis but look to be sure, they're labeled on the bottom of the chassis. Keep us posted!
    All I want in life is to turn wrenches and climb around pinsetters/pinspotters again :/


    • #3
      Re: 82-70 CHASSIS PROBLEM

      just so everybodys knows if this happens to you, this is how i fixed my problem. i changed the diode under the spot relay and that solved my problem 100% was a 1n2069 replaced with a 1n1404.

      just thought you would like to know

      jim k.


      • #4
        Re: 82-70 CHASSIS PROBLEM

        The KX relay can cause the breaker on the back of the machine to trip - usually slowly. The diodes can be replaced with just about any common rectifier like the 1N4004 or so - cheap at radio shack. Also, sometimes a diode will check "good" on a multimeter, but will actually be leaky & will cause problems, so when in doubt replace it. Look for a short in one of the 3 power diodes & also from the heatsink to ground (screw, nut, etc). Even after all that you may have a bad T1.

        Jon [img]/content/btubb/images/%%GRAEMLIN_URL%%/usflag.jpg[/img]
        I've had enough of hope & chains.


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