A shorted battery charger repaired. Model: Mosta-ZXR DC 1418C
A customer who makes windows out of aluminum brought this battery charger for repair. It was a dead battery charger and this customer wanted it as soon as possible. I was really impressed with this guy because he works with dangerous tools and yet, he was half blind. I do not know how he does it but I was willing to do more than enough to help this guy.
Any ways, I powered this battery charger up and I did not see any indication of a working machine. In this kind of battery charger, the light indicated by the arrow should come on green and flashing.
Once the battery is in the charging port, it should become red and flashing.
As you can see in the photo, this charger can charge starting from 9.6 volt batteries up to 18 volts batteries at the rate of 1.5 amps.
The moment I took these four longs screws out and took the cover off, I was able to see the inside of this charger.
It looked brand new inside and I did not see any dust in there.
As I said before, this charger was dead and the first logical step in this repair to check the fuse. The fuse was open and because it was open, now I have to check the surrounding component before I put a new fuse back on board.
The second logical repair step is to check the diodes. All these diodes were in good working condition. Usually, I replace these diodes even if they are not shorted. The reason I did not because the entire component in the primary section were ok. Later on, the customer told me that for some reason he cut the power plug off and he just inserted the two wires brown and blue in the wall power socket that is why I believe the fuse was open.
After the entire component in the primary checked ok, I decided to do one more step to make sure. I added a 100 watts light bulb to the main fuse and powered up the machine. The light bulb remained off and I could see the charger light coming on.
That is an indication for me that all is safe and it is time now to add the fuse to that charger and charge batteries. Mission accomplished.
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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