A Bridge Rectifier Replaced In This Welding Machine Restored It Back To Life
A welding technician brought this machine for repair; and while welding, the machine just stopped working and the earth leakage tripped. He called me right away and after few minutes, he was already at my shop demanding a fast repair. I told him he has to wait till I test it and see what was wrong with it. He was not happy with that but he was willing to wait and see.
The machine was already opened and I headed directly to the bridge rectifier because the customer mentioned something about earth leakage tripping so that was my focus.
Soon enough, when I tested the bridge rectifier, it was shorted and needed a replacement.
Usually they do not come out very easily but this time I used a low melt solder and applied it to the bridge rectifier pins; with hot air using a hot air station, the part was out in no time.
As you can see it was shorted and needed a replacement.
I have plenty of bridge rectifiers in the shop and right away, I cleaned the area with alcohol, applied flux, thermal paste and re soldered it back paying attention to the negative and positive orientation on board. I checked the surrounding area for any defective parts and found none.
Through a current limiter, I powered on the welding machine and I could see right away, the light bulb was dim and the power button lit as expected.
I powered it up again and tested for voltage reading at the negative and positive terminals and as seen, the right voltages were being displayed here. I took it next door for my brother to check and it worked 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 article on A Dead Turkish Welding Machine Was Brought Back To Life. Model: Weld-200T