My New ESR Meter Found Bad E-caps
A carpenter who lives nearby my shop brought this battery charger for repair. I was out on a repair mission when this customer brought it and gave it to my brother next door.
When I came back to the shop, and called this customer about the fault of this charger, he explained that the moment he put the battery on it, the light switches right away from green to flashing red light which according to the manual, it is a fault taking place in the charger.
As I tested the charger in my shop, I saw the same thing the customer said except I could hear a relay clicking and then the red light on the charger comes on. Very Interesting.
As I worked on such chargers before, I can say for sure that some capacitors are faulty and needed to be changed. To confirm that, I tested them with my new ESR meter and look what I found.
It was 470uf/35 volts and I was supposed to get 0.1 reading on the meter but according to this meter this capacitor was faulty. I tested the other capacitors on that board but all of them were good except this one. So I changed it with a new one and tested it out but the result was the same.
My second suspect with the relay itself since it was still clicking. I noticed when I tap on it with a screw driver; the charger comes on and starts charging indicating a faulty relay.
I replaced these two suspects and then I put everything back and tested the charger and…
As you can see, the battery was charging fine this time. This green light was flashing indicating a good charger.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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