Welder gave out on me.

I have pulled the covers. I didn't find anything obvious like a burnt component or
loose wire. The machine still turns on but I can't get any amps or heat out of it to make
a weld.
There are a lot of diodes, resistors and who knows what all to see with the covers
taken off. I am going to have to learn how to I'd and check these components to determine
which part or parts to replace.
I have been looking at fluke meters and their are many and with different features.
Makes for a tough choice being inexperienced around electronics.