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How To Repair Mixer Power Amplifier
The complaint of this UKC Mixer power amplifier was no power. The first component to check is the main fuse but it did not blow but the toroidal was very hot that it melted the plastic cover-see the photo below:
What caused the transformer to overheat? It will be surely a component that is shorted that had caused the transformer to go overheated.
From visual inspection of the mainboard, there were no burnt components-see the photo below:
But when I checked on the bridge rectifier on board, i found that it was shorted-see the photos below:
I do further testing on some other major components and all seems to be in good condition.
I concluded that it was only the bridge rectifier that was shorted and the result was an overheated toroidal transformer.
I found a replacement and the part number is RBV-406M and the rating is 600 volt with 4 ampere.
Once the replacement was done and powered On, the mixer amplifier came back to life-see the photo below:
Conclusion- In this case, there was only one faulty part and it didn’t take me long to finish the job. If you wish to learn how to check components so that you can start to troubleshoot electronic equipment you can check out Jestine’s ebook here. It comes with many photos to guide you how you can check electronic components the professional way. Ok see you in the next post soon.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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