Got this unit in for repair. It had a hlp20 error. Replaced the controller and now have hlp 23 very low output on generator and welder. Brushes and slip rings are ok. I only see abut 12 vdc at the field... I am wondering about the scr`s. The gate leads check open on one scr in the dual scr package. Not sure how to test these accurately. I have not scoped the gate leads yet but that firing signal comes from the controller that I replaced so IDK! anyone here know about these or have a source for a service manual? This one has the Kubota engine.
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Miller big blue 300 pro hlp 23
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