Fixed Cap Found Cracked In SUPERCOMP SEP-500 ATX SMPS
This computer SMPS is one among the five brought from my hospital, where I work (now from home). Cleaning was already done by the staff there and that saved my time.
I saw a lot of dry solder on the board and one 102/1KV Blue capacitor burst in the primary switching side.
The values of the two tank capacitors were found to be way out:
As I could not get the exact size of the caps, I had to shift the bleeding resistors as well as one of the startup resistors valued at 500K behind. Incidentally, this was found open.
As I did not have a 500K, I used two one meg resistors in parallel to make it 500K. There were two resistors in the startup section, both 500K connected in series.
I replaced all the electrolytic capacitors on the board and did a thorough dry solder patch up. Then the SMPS was found working very well on testing:
Mission accomplished and satisfaction got collected.
Here are the components that took retirement, after putting in a very long service:
This article was prepared for you by Parasuraman Subramanian from India. He is 72 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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You may check on his previous article on How To Fix Foxin ATX Power Supply