Zika A-200 Welding Machine Powers On But Does Not Weld Repaired
The Zika welding machine are very good machine and worth the fix that is what I told the customer when he brought it in for repair.
As the customer waits in the shop, I powered on the device and right away I could see the overheating light coming; an indicating of shorted parts inside this device.
And as expected the machine was dusting and a lot of dirt is accumulating inside the device.
So first of all, with dust buster, I blew all the inside dirt and dust away which gave me a clear clean printed circuit inside allowing me to see what was going on inside this welding machine.
That is the main brain of this welding machine and if you look to the edges of this board you would see markings with positive and negative. In other words all the Mosfets of this device are connected here; in order for me to check which Mosfets are shorted out, use a multi meter set to diode and test these points and that will lead you to the shorted parts. It should give you reading like a diode reading in one direction only and all should be the same reading or close to each other. If one reading is off or gave you shorted reading, trace that line and it will lead you to the shorted Mosfet/s.
This is the first time I am sharing this kind of knowledge about a fast way to find shorted Mosfets in welding machines and it is the same testing in most of these devices.
In doing that kind of testing lead me to these Mosfets that were shorted out and needed replacement. It is 23N50E.
The first photo shows the shorted reading of a Mosfet, the second one showing reading of a good Mosfet. This meter has been a very good assets in my shop and I have been using it ever since.
I found two Mosfets shorted out. I replaced both with new ones and tested out the machine. I was getting an excellent reading here as it should be in this Zika machines and as always, took it to my brother next door to give it a try and as expected, it performed 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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