Miga Spot MS160 MK III
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  1. #1

    Miga Spot MS160 MK III

    Hi! I'm new on this forum. I bought a used "hybrid" welder I have to repair. This is a spot welding able to weld in continious with the shield gas (MIG). Manufactured in 83 by: Controlled Systems (now "supported" by AMH). Cannot find my answers at AMH. First I would like to know how it is supposed to work: if I use spot mode, gas solenoid and feed wire are off ? At this time my gas solenoid is always on (spot or mig mode) and feed wire motor always off (motor checked alone is o.k.). One electronic part is missing on the "copper plate" used to mount the output components. I think this part is used to stop the feed motor when overheat appears. It's a "TO-3" mount for transistor. is the missing part a transistor ? The circuit diagram or any appropriate info. would be appreciated. Electronic board is: CS-MIG MK 3 83127. Thanks

  2. #2

    Re: Miga Spot MS160 MK III

    Check the white spot inside the copper plate on the left. The white comes from a heat transfer cream.
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  3. #3
    Join Date
    Mar 2010
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    Re: Miga Spot MS160 MK III

    AMH couldn't or wouldn't help you?
    Who elses name is on the welder.
    You might be able to get a manual through them.
    If it is a napa welder. they bought them from clore automotive who bought them from controlled systems. Clore might still have some books.

  4. #4

    Re: Miga Spot MS160 MK III

    To ccawgc: I asked my questions to AMH but i'm not sure I will get something... "It's very old... no more parts... maybe we have the schematic... will see..." !!! I,m waiting !!! Controlled systems was the manufacturer, Windsor (Ont.) and Detroit written on the nameplate.Don,t know if there is a link with napa. What's "clore automotive"? I began to draw the circuit. Power part is easy; the electronic board is a long job... for me! But I'm not in a hurry with that. Thanks. Strongrock.

  5. #5

    Re: Miga Spot MS160 MK III

    here is the front of the welder.
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  6. #6
    Join Date
    Nov 2006
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    5,748

    Re: Miga Spot MS160 MK III

    Quote Originally Posted by Strongrock View Post
    . . .One electronic part is missing on the "copper plate" used to mount
    the output components. I think this part is used to stop the feed motor when overheat appears.
    It's a "TO-3" mount for transistor. is the missing part a transistor ?
    Probably a simple thermostatic switch.
    Any nearby taped-off leads?

    Good Luck

  7. #7

    Re: Thermo switch

    For sure the missing part is not a thermo switch but probably act as. There's three connections on the back of the socket: one goes to the (+) of feed wire motor and board (?), one to the + of the supply and the third to the board (?). Connections seems from origin and not altered. The case connection of this part is isolated with a mica film (case form). Strongrock

  8. #8
    Join Date
    May 2009
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    Re: Miga Spot MS160 MK III

    Sounds like the missing part is the driver transistor for the motor speed output.
    Is that Mallory capacitor in the background,unhooked on purpose?
    Last edited by Bluewelders; 09-16-2010 at 07:54 PM.

  9. #9

    Re: Miga Spot MS160 MK III

    To bluewelders. You have the eye! This cap. is used for the filtration of the dc supply (just after the bridge) for the control board, and was on test: have to be replaced and the supply is now o.k. About the "transistor", I think it brings a minus to this side (normally pos.) to stop the motor cause the other wire of the motor is directly to minus of the supply...??? The pos wire run from the board to one leg of the missing part directly to the motor. I hope to get some info. from AMH.

  10. #10
    Join Date
    May 2009
    Location
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    Re: Miga Spot MS160 MK III

    It could be the motor brake, to stop the motor from coasting, when the trigger is released.
    Usually a relay is used, but a transistor would work,it would have to handle quite a few amps though.

  11. #11
    Join Date
    Mar 2010
    Location
    Ceres, California
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    Re: Miga Spot MS160 MK III

    clore automotive used to own century welders before Lincoln electric bought century.
    They still make the solar battery chargers. They used to market all kinds of welders to auto supply houses under the supply house name. Some they built and some they brought in from else where.I had a NAPA auto parts welder is my shop That was sold to NAPA by clore and it was built by controlled systems. AMH did not have any parts, but they did offer to repair the pc boards. Because it went through clore they had the service manual.
    Some times you have to be a detective to find the history and a source of parts for these welders. Push AMH to look in the archives and see if they will send you the diagrams.
    Maybe offer to pay for copying.

  12. #12

    Re: Miga Spot MS160 MK III

    ccawgc. You read in in my mind. I send an e-mail to AMH this morning, offering to pay for their service. That's the place where it's supposed to end. I hope they will move... Thanks for the history of clore automotive. Strongrock

  13. #13

    Re: Miga Spot MS160 MK III

    I receiced my answers from AMH Canada : a good schematic diagram. So consider this thread over. Thanks. Strongrock

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