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This time the welding machine service is on but can't weld or how to repair the welding machine that doesn't output voltage with the Firman mma120 brand so the Firman welding machine is on but can't weld oh yes in the previous video it has also been discussed that the welding machine is on and the fire doesn't come out directly how to repair the welding machine that has lost its fire for the cause of the welding transformer turning on normally but but the fire doesn't come out there are many causes but this time it's not because of OC or protect the first step as usual check the power supply voltage is 24v normal or not then check the pwm by checking the frequency does not come out and the Firman mma120 machine this time it turns out that the frequency does not come out which means the pwm doesn't work automatically the gate voltage does not come out after checking it turns out that the sg3525 ic is problematic or damaged and previously it was also like a used replacement and immediately replaced it with the Ka2535 ic and a little modification in the 22k resistor in series with a 1k resistor and the test turns on the frequency comes out and checks the gate voltage also comes out automatically the output voltage or the welding fire also It's out, that's how to service a welding machine that's on but won't weld. Hopefully, this is helpful. Don't forget to SUBSCRIBE, LIKE, COMMENT, AND SHARE. #anekaelectronic #weldingmachineisonbutcan'tweld #firmanmma120