Jon Andriotis
New Member
- Messages
- 10
- Location
- Georgia, United States
First off I am a novice welder and I must say that I am no electronics wiz, I probably know just enough to be dangerous. I was given a Snap-On MB135 that at first would not feed any wire and I found a burned trace on the PCB with the feed controller on it (from the Line in in to a relay). I repaired that with a piece of wire. Voila! the wire started to feed again. Problem is it was welding like crap except every now and again on some thin sheet metal. After much research, figuring, and head scratching I came to realize that the feed rate is very low (about 230 inches per minute MAX). The wire spool had rust on it so I cleaned the liner, the wire and sprayed everything down with WD-40. The wire started moving smoothly through the liner and the speed increased greatly (I haven't measured it yet). Problem is when I pull the trigger and freewheel it, it moves very fast, but then I tried to strike an arc and it bogs right down. I thought it was in the controller PCB but after reading some posts in here I am wondering if I may be barking up the wrong tree. I read one post that said the Voltage range switch could have poor contacts causing an issue such as this. I am wondering If anyone has any knowledge of this animal and could pass along some wisdom. I am also wondering If anyone has a schematic for the wire speed controller PCB for an MB135. Im Not sure but I believe that the MIG135 is going to be the same or very similar. Thanks for any input.