A shorted gate control board was brought back to life
An out of town man came to my shop and asked if I repair gate control boards. He explained that while the electrician was working in his house and was about to leave. The customer tried to open the gate for him, and something happened. The door could not be opened and he could hear a tiny tick noise when he tried to push the open button on the remote control.
I have worked on this kind of boards before and I told the customer I will try to fix it for him. The reason I said that because sometimes, faulty parts for such control boards are hard to find and if I find them, they would be expensive to buy. He said to go ahead and give it a try at any cost.
The first thing I did was to check the fuse. As you can see in the picture, there was no fuse. It is a 3.15 amp fuse. All the information was printed on the board.
You can see it just to the right of the fuse holder. In fact all the board output and inputs are marked which made my repair job a little bit easier. Take a look at this photo.
I am recalling what the customer said about hear a tiny tick noise but I looked everywhere on this board and I could not find any burn mark on it. The only thing that comes to mind with that tick sound is the main fuse. I am almost sure that the electrician tried to repair it and forgot to put the old blown fuse back in its holder.
Here is the main power transformer inside the gate control board. It is suppose to get 220 AC and then step down to 24 volts.
At this time, I flipped the board over and started checking the board out to understand how it works and look for unusual things.
When I traced the 220 AC source to the board, I found a capacitor with one of its pins loose, I cleaned the area and soldered that pin. I decided to power up the board.
I have used a 100 watts light bulb connected to the fuse terminal. Look what happened. I replaced the fuse and powered it up. 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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