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A dead emergency light repaired
These kinds of lights are used in my home town a lot. The electricity goes out very often especially in winter time. Many people buy emergency lights; charge them so they can use them when the power goes out.
It stays plugged in main power which is 220 volts. When the power goes out, this emergency light come on and when the power is restored, light goes off and back to charging. It is a very interesting. The next photos show what inside this emergency light. It is a very easy board and fixing it is easy as well.
From the 220 volts it goes to a (10 AC) step down transformer then to a power board. There should be a 7-8 volts DC coming out of the board to charge a 6 volt battery. This battery is the only power source after the main power is out. Usually when not charging, either the battery is not getting enough power to charge or the battery is dried and not charging any more. Most of the time, the problem in these lights is the battery.
I disconnected the main battery and checked for volt reading there, I got 7 DC volts. According to this reading, this emergency light was working fine and the only thing that is not working is the battery. I tested the battery with a volt meter and it should me only 2 volts which is an indication of a bad battery. As you can see in the photo, it is a 6 volts battery and it should light up to 2 hours when the main power is out.
There is a technique that I use to make sure that only the battery is bad. I disconnect the light from the main power and then add a 6 DC volt power source to the main black and red wires. If everything is ok, the light should come on and that is exactly what happened giving me the assurance that the battery is dead and need replacement.
I replaced it and sure enough, the light came on. For your information, these kind of batteries need to be charged at least 11 hours before any use. If batteries were not charged 11 hours, they will not last long.
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. Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.
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