Saving Computer SMPS – PART 5
Continuing my efforts to reuse as much Computer SMPS as possible, following two cases are being shared to promote service of such ATX Power Supplies. There is a general tendency to discard and buy a new one, indirectly adding up E-Waste. My intention is to arrest such throw-aways!
- ZEBRONICS 450W SMPS :
Capacitors were found bulged and were removed.
I did a ring test and found it healthy:
On checking the caps, the values were way out:
Replaced all the capacitors and retouched the board very well and cleaned it thoroughly using IPA. Then looked for any man made shorts, which are likely as we do the retouch fast without observing the tip of the iron touching adjacent points. There were two such cases, which I rectified. Then applied power with a load of 12V, 25W automobile bulb, along with the SMPS fan.
The ATX power supply checker showed healthy result. I allowed it to run for some time, before closing the cover and taking up the next. Incidentally, this again is a part of my free service to the hospital. I do not even collect the cost of spares!
- MERCURY KEZ-M200 :
I have worked on this SMPS long back. The tank capacitors were found burst. Fuse was blown. All rectifier diodes were short. Removed these and then did a ring test with a healthy result. Then replaced these defective components. The board was in good condition without a need for retouch.
All other electrolytic capacitors were found to be ok. ESR reading was also good! So, applied power like in case (1) above with a good result:
Mission accomplished with double satisfaction getting added to the collection!
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 Saving Computer SMPS – PART 4