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Servicing 12 Volt SMPS Adapter
This SMPS 12V Adapter was brought to me with the complaint that it was dead. On opening it, I observed that the tank capacitor was bulgy. Checked the ESR of all electrolytic capacitors and found that except one 47uF/16V in the primary, rest was ok. Checked all the components in the primary as well as the secondary and did not find anything wrong in any of these.
Since the Tank capacitor was 15uF/400V, which is not available in the market, I replaced it with a 22uF/450V.
The size of this is a bit more, but managed to place it in. Replaced the 47uF/16V with a 47uF/25V capacitor.
Removed the secondary wire and soldered two cut pieces of leads in its place to ease checking the output voltages. I take these precautions because such small SMPS adapters might explode like a bomb, and might shock the hell out of you, if not injure you. So, it is better to keep a safe distance. Moreover, to check the DC socket, we need to use both of our hands holding the DC socket and sometimes the inner portion of the DC socket might be too tiny to insert a probe. So, this is my standard practice.
Checked the adapter, by giving the power through a series bulb and otherwise, and found it to be working perfectly fine!
Here you can have a close look at both sides of the PCB:
Thus an adapter was saved from the dump without any complications. Needless to mention that another one added to my satisfaction list.
I have an important news to announce to the readers, which I keep it as a suspense until the next article!
This article was prepared for you by Parasuraman Subramanian from India. He is 69 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
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