VanUnamed
Newbie level 3
Hello, I have a KA3525A Chip that controls a plasma cutter board. The plasma has been checked for all obvious faults (defect is it turns on gives air but no "sparks") nothing turned out to be faulty. I have checked pin 11 and 14 (the two outputs) in circuit with an oscilloscope and instead of getting a square wave like it is supposed to on the dataheet I get something like a sawtooth wave. I have removed said chip from the circuit but I have no idea exactly how to test it separately from the circuit, I was thinking to apply about 12V on VCC ( I have 11V on VCC when in circuit) and then check with the scope again, but I don't think it can be that easy.
I have also checked tiny transistors around the IC, resistors, and capacitors as well, but only the electrolytic ones. the chip takes its VCC supply from a board down below (the one where the AC gets in) and the connector has 24V as printed on the board)
Thanks for any reply.
I have also checked tiny transistors around the IC, resistors, and capacitors as well, but only the electrolytic ones. the chip takes its VCC supply from a board down below (the one where the AC gets in) and the connector has 24V as printed on the board)
Thanks for any reply.