IGBT and Industrial Bridge Rectifier Shorted
The machine was donated to me about two months ago because the customer thought it was too expensive to be repaired so he went and bought a new machine instead.
I was planning to dismantle the machine and use it for parts but today I decided to get it fixed and if I find a buyer I would sell right away.
The first thing to deal with was the bridge rectifier (industrial type) because it was already shorted.
Once that part was replaced I headed to other blown parts in the machine.
There were two IGBT’s that were shorted and right away I went ahead and replaced these two blown parts in this machine.
The last fault to take care off was the loose connection of this cable which is connected directly to the positive output welding terminal of the device.
I believe this was the damage cause found in this device because I found sparks and arching marks inside.
I cleaned that area and re soldered it and I was ready to test out the machine. So I put it all back together and gave it a try.
I connected it to a current limiter and powered on the machine. The voltages were coming out as expected. The negative reading you see on that meter because I got my multi meter probes reversed but everything was according to specs once it was tested at my brother’s shop.
Now I am going sit and wait for the right customer to come in and hope for the best.
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 Massage Device Repair