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.
Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.
P.S-If you enjoyed reading this, click here to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!
You may check on his previous article on How To Fix Foxin ATX Power Supply
(60)Dislikes
(0)
11 Comments
Leave a Reply
Yogesh Panchal
July 13, 2021 at 6:23 pm
Good Job!Sir.
Parasuraman Subramanian
July 15, 2021 at 9:15 am
Many thanks for your comments!
Albert van Bemmelen
July 13, 2021 at 6:56 pm
Those blue 102/1KV capacitors are probably also harder to find, like the same size tank 330uF/200V ecaps?
Parasuraman Subramanian
July 15, 2021 at 9:15 am
No, these are available aplenty here! Many thanks for your comments!
Abraham Getahun
August 23, 2021 at 11:08 am
Good job Sir, but my question is is that the cracked (1kv) component a varistor (MOV) or a capacitor. It seemed to me a
Humberto
July 13, 2021 at 9:40 pm
Good repair Parasuraman. Great deal of componentes had to be taken out.
Parasuraman Subramanian
July 15, 2021 at 9:16 am
Many thanks for your comments!
Manuel
July 15, 2021 at 2:42 am
Thank You so much Parasuraman.
Parasuraman Subramanian
July 15, 2021 at 1:20 pm
Many thanks for your comments!
Waleed Rishmawi
July 15, 2021 at 2:46 pm
lots of parts replaced but the machine is up and running. good job
Parasuraman Subramanian
July 15, 2021 at 5:07 pm
Many thanks for your comments!