A Door Motor Control Board Repair
A strange thing happened today as I was working in the shop; an electrician came in and showed me a door motor control board. I checked it out and found some nasty burns marks on it. There were three fuses on that board and none of was open.
The guy had a strange story to tell about this board. He had installed it for another guy about four months ago. Today this electrician got a call to go and take a look on this board. When he opened the box of this control board, he found a lizard half fried in that box. The tail was touching the neutral terminal and the head was touching the phase terminal on that board. This Lizard was have fried and below this fried lizard, the board was also burnt. At first I thought it was a dead board but I was wrong. Let up begin the repair.
I cleaned the board and found some marks of burn on board but not as bad as I expected. The neutral and the phase terminals were dark but with some cleaning solutions they became shinny again.
I re soldered all the soldering joints on that board. I reconnect a lot of lines on that board and made sure all the line on that board are in working condition. I cleaned the burning marks and reconnected the ac wires. I wanted to make sure there was any kind of short on that board so I connected a light bulb to the main fuse and powered the board and all the lights on that board came to life. The light bulb was dim which means it is safe to put the fuse back on board.
There were two relays on that board on to give signal to one side of the door and other relay for the other side of the door. I have to give it an order to make sure that both the relays are in working conditions. I made a wire jumper and connected one side to open and the other side to open and the relay clicked and I could read 220 volts on one side of the motor terminals. I did the same thing with the other side and it worked fine as well.
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.
By the way if you have any good repair article that you want me to publish in this blog please do contact me HERE.
(17)Dislikes
(0)
4 Comments
Leave a Reply
shehab kably
June 23, 2013 at 5:07 pm
Nice article but poor lizard
Waleed Rishmawi
June 24, 2013 at 5:50 pm
Indeed. Poor Lizard. life goes on. lol
Andre Gopee
January 24, 2014 at 11:53 pm
Nice Article.. You should of take a picture of the Lizard and post.
Amendar
February 14, 2014 at 6:37 am
Hi Waleed,
I just read your interesting post, a fired lizard becomes a conductive
substance with a resistance and AC current passing his body makes heat
and continues till you have a dead pcb with some burnt on it, isn't it?