This is my first time posting but I have gained a lot of knowledge from this community over the past few months.
Here is the situation: I have an old Hobart OM-321 Tig welder which my tech has told me that the high frequency starter is not functioning and generating no arcs. The rest of the welder is fully functional. In attempt to debug things step by step I first checked all the capacitors, switches and fuses to the HF circuitry. No shorted or blown caps, switches were functional, and fuses were all good.
I began looking at the transformer, and here is where my knowledge is a bit shaky. I saw three wires, two attached to a smaller coil. A third wire was attached to the larger coil and a ground wire connected to the case. I'm used to seeing step down transformers which has one coil with multiple wires for the selection of voltage level. There is no spec sheet or data sheet and supplier is not responding. If there a method to debug this transformer to see if it's still functional?
effective resistance across the two leads to smaller coil is 7Ohmns effective resistance across single lead from large coil to the ground connection is 2.7KOhms
That is all the information I currently have. The goal is to verify if this transformer still works. Currently have the assembly removed from the welder so if there is a way to debug without power, that's ideal. Otherwise instructions with power would be sufficient as well.