Transformer Problem In USB FM Receiver
This USB FM radio receiver came in for repair with the complaint of no power. With few screws removed, the cover can be lifted up.
I powered On the set and check if there is any AC voltage at the secondary side of the 3 volt linear transformer.
And the result, there was totally no output voltage which could mean either the transformer itself have problem or the primary side area has an open circuit.
When I checked on the linear transformer primary winding I found that it was having problem.
And when I carefully observed the transformer, I saw that there was burnt mark in the transformer probably overheated-see the photo below:
Since the transformer already burnt, I left no choice other than to replace with a new linear transformer with the specification of 3 volt output 300 Milliamp (ma).
It was working fine so I installed the transformer back to its location.
It is not tough to repair electronics devices. The best you must know the systematic approach of the troubleshooting procedure. If you are a beginner and would like to venture into this repair field whether to be a repairer or just for hobby interest you can check out Jestine’s Ebook here.
This article was prepared for you by Suranga Bandara who owns an Electronics shop in Anuradapura, Sri Lanka.
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Note: You may check out his previous repair article in the below link:
https://www.jestineyong.com/enzer-dvd-no-disc-problem-solved/
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Mark
August 24, 2015 at 11:47 am
Hey Suranga,
Thanks for your article. Its great when it is a simple repair, but it is still the process that we can learn from that makes us better repairers.
Robert Calk
August 24, 2015 at 12:43 pm
Good job, Suranga. Thanks for the article.
jim asch
August 24, 2015 at 2:08 pm
very good information thanks jim ham call wb9orv
aziz
August 24, 2015 at 2:32 pm
Very good . Thank you
Yogesh Panchal
August 24, 2015 at 3:49 pm
Suranga,
Another good quick fix.
Merlin Marquardt
August 24, 2015 at 8:56 pm
Good repair.
Chris
August 27, 2015 at 6:51 pm
Suranga thanks for sharing.
Excellent picture quality and very interesting, simple quick repair for novice in electronic world.
My best regards.
Raju varghese
August 29, 2015 at 2:21 pm
Hai suranga ,good job Thank you for sharing
sreenivasak
August 29, 2015 at 5:38 pm
this could have been concluded when the radio functions on batteries