Two AC Adapters Were Saved From Dump
These two AC Adaptors of the hospital, where I work, were brought to me in dead condition.
- DELTA ELEC EADP-60BB A : When I checked this adaptor for output, it was coming and going dead. On checking the primary with Ring Tester, it did not show any unhealthy symptoms. On further checking I traced that the fault was on the LED of power on indication. It was dead short and the resistor was burnt. I replaced both and it worked perfectly well when checked with a 12V, 25W Bulb as load. As the soldering was fine, I did not retouch the board. The capacitors also passed ESR tests.
- AC ADAPTOR LR 120500 : When I opened the cover, I saw two bulged capacitors in the secondary, which could only be the cause for failure.
After replacing the caps, when I checked, the adaptor was working.
As the board looked very neat with no dry solders, I checked the remaining caps with ESR meter and it passed the tests.
I gave a 12V, 25W automobile bulb as load and checked and it was found working perfectly well.
Here is a picture of the caps replaced:
Satisfaction in double found its way into the collection bag!
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 No Load Taking Computer SMPS Restored