Chosen Solution
Hi all , i have an NBC250 inverter mig welder which has no spark , the fan works ok , the wire feed seems ok when i press the torch trigger just no arc , i have checked all the mosfets and diodes on the large heatsink (labeled on photo) ,all these check out ok .. The only place i don’t seem to get any voltage is on this one cable which goes from the bottom board with all the mosfet / diodes , circled in red , im not sure which board should feed which and when ..
I solved this , there was a burned resistor on the upper board , see the no voltage at the pin note in above photo,
Well done for solving your problem. I wonder if you’ve been taught this or if you’ve learned how to do it properly yourself. I just want to get a job as a welder after school, so I’m asking about it. I just looked on the Internet that you can go to courses weldingnearyou.com . However, maybe there is an alternative option? Perhaps some college, or something like that. Or do I still have to take courses and then work without higher education? Sorry, of course, that I ask you this, I just want to become a qualified specialist who knows how to do everything in his profession.
