Millermatic 250mp Problems

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Greetings guys, Anyone familiar with the millermatic 250mp? I recently bought one used locally, I Had been saving for a mm251 but this one came with a bottle and a 35amp thermal dynamics Plasma cutter. Well neither one looked very used, but they were plenty dirty from being stored for years in a storage shed. I pulled the side covers off the 250mp and found several muddobber nests, one was smack in the middle of the main control mother board. After Gently removing them, and cleaning the rest of the machine. I plugged the machine in and ran several nice beads on a scrap of 3/8' stock.I was very pleased and decided to clean up the plasma cutter, same problem, muddobers everywhere. Took several hours to clean the T/A It Had three golf ball sided nests stuck to the main motherboard. I Installed new consumables turned it on and it cut like a laser, again very pleased. well yesterday I thought I would go out and run a few more beads so I turned the miller on, clamped my work piece,Touched the stinger to the metal pulled the trigger and nothing!!!The welder sounds like it's working but it just feeds wire and blows shielding gas. I have performed the self test, and it says all functions are go. I have tightened all the grounds and checked them with the volt/ohm meter with the trigger pulled and get nothing.Am I missing something? It kicked butt the other day,now nothing but Wire and CO2. Sorry so long winded.Signed: should have bought the MM251Doc
Reply:I would look at the simple stuff first.......And that would be the contact tip & the liner.Common sense tells me that the trigger works.....(you pull the trigger and gas & wire come out)........all you need is electricity.........And the electricity gets to the wire via the liner and, finally, the contact tip !I'll be the LAST one to let you down !
Reply:It happened to me last week. I fooled around for 10 minutes before realizing my ground clamp was on the floor. And I'm only 42 years old... if I remember correctly.Last edited by Sirarcalot; 04-26-2004 at 11:40 AM.MM175Lincoln AC225 Tombstone
Reply:*LAUGHING*.....Don't feel like you're alone !...I've done that !  I'll be the LAST one to let you down !
Reply:Lol...Thanks for the humor guys,  I am very capable of making those mistakes but I even went as far as trying to start an arc on the ground clamp. I guess i will load it up and cart it to the welder hospital Thanks againDoc
Reply:Originally posted by doctane Lol...Thanks for the humor guys,  I am very capable of making those mistakes but I even went as far as trying to start an arc on the ground clamp. I guess i will load it up and cart it to the welder hospital Thanks againDoc