Shorted Mosfet 23N50E
A welding technician brought this welding machine for repair with the complaint that it comes on but does not weld.
Zika welding machines are expensive and also very good ones to have and operate.
The way it is built amazes me and I love to work on such machines.
When I powered on the machine, the yellow warning Led came on indicating a short somewhere in the device and the machine is in the protecting mode.
From experience, when I see this warning light come on I head directly to the Mosfets of the machine and sure enough it was giving me a short on two of the Mosfets there.
I started to take them off board one by one for check up and found that only one Mosfets was shorted causing the machine not to weld.
As you can see, the part number is 23N50E and I have shared the technical sheet in previous article. I have plenty of these in the shop so right away I replaced the shorted Mosfet and scanned the machine for another fault before powering on.
This welding machine was designed to give you the best welding but with that it is still a machine; the machine needs maintenance all the time. The customer informed me that this machine runs almost 8 hours a day and only gets half an hour break and that when they go for lunch.
I replaced the melted power plug and with an air blower I cleaned the dust from inside the machine and then I was ready for a welding test.
As you can see, the machine is up and running but of course that was not the ultimate test. I took it next door to my brother’s welding shop and gave it a try. Every was according to specs.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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Note: You can check his previous repair articles in the link below: