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This SMPS was brought to me with the complaint that it was dead. As usual, first thing is to open and do a thorough cleaning, which I did. Dismantled and saw a lot of damages that have taken place in the board! I saw transistors, resistors burst and burnt. I saw tracks burnt!
Found another transistor, opto-coupler and diodes short!
Replaced all these components and did a thorough dry solder patch up. I did not find any Electrolytic Capacitor out of ESR.
Replaced the fuse, even though it was not blown (?) as advised and cautioned by seniors in this forum earlier.
Connected the power through a series bulb and found it to be working perfectly well. The voltages were also measured for accuracy.
Fit it back to its case and after thorough ‘soaking test’, gave it to the customer.
Another attempt of the ‘dump devil’ stumped, and added to my list of satisfactory services!
This article was prepared for you by Parasuraman Subramanian from India. He is 68 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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