Looked at a Miller Legend NT for sale. The 60 and 100 Hz output seemed ok (slightly low) and the AC welding output worked. There was no DC welding output. We looked at the rectifier and found nothing visibly wrong: Connections seemed tight, no signs of overheating. I could not make sense of the rectifier in-circuit, it seemed to have continuity in all directions with less than1 V drop, but the test current is only a couple milliamps, so it likely isn't relevant.
Has anybody encountered this problem? Google found essentially nothing on the likely keywords. The rectifier seems available, but the inductor (called DC-Z in the parts list) is not. Being flummoxed I only offered $400, but the seller said he was in for $1500 and didn't want to take the loss. I'd raise the offer if I had a clue to what's wrong.
The welder is in fair shape: 3500 hours, starts easily, puffs smoke on start but clears up. Oil and air filter appear to have never been changed. Slip rings are good, visible but not feelable grooves. Tin is beat up but complete. I'm unlikely to wear it out.
Thanks for reading,