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RC-250 will not respond to power switch

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  • RC-250 will not respond to power switch

    Hello
    I am a new member. I tried searching and found nothing about the welder I have. My father bought it new in 1980 and it has been used for thousands of hours in his machine shop. I started having an issue yesterday. The welding unit will not power up reliably. Is there a known source for the schematic?
    the issue may be related to the two red wires that seem to drive the relay that energizes the welding and wire feed unit.
    The serial number is 78W526596.
    Thanks in advance for any help you can provide.
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