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Electronics and Circuits
repair lamp 12v UV tubes
470
hace 5 años
hace 5 años
Hello friends of Yoreparo
I have a 12v lamp with 2 fluorescent tubes, I work with that lamp because it uses 2 tubes of 6 watts each ultraviolet light. (The tubes are new)
Some time ago I realized that it began to lose power, the tubes ignite the same, but as I use that lamp to cure resin, if it used to take 2 minutes to dry it now takes up to 10 minutes. I want to know why the loss of power and how it can be fixed.
I am not understood in electronics, I can only make minor repairs in simple circuits, so I ask you not to use technical language please.
Unfortunately, I could not find any similar lamp, so I am thinking of repairing it by changing what is necessary, it is very urgent to have it operational, I depend on it for my work. It is 12v because it allows me to take it anywhere, if there is no battery, I use a 220v to 12v transformer.
Thank you.
549
hace 5 años
hace 5 años
Hello, for what you think it seems to be the problem of the electronic ballast and I don't know what it can be, but how it works I would test the two electrolytic capacitors, in case they were low in capacity.
In case the ballasts or reactance are of no use to you, they are not special for UV, you can use any of normal light tubes. Even if you want to try a normal one with a primer it works the same (6 W or 12 W putting them in series), and you rule out problems in the tubes.
Somewhere I saw that if a sheet is placed underneath it is grounded it goes better, the gas is better inonized, I could see that the metal reflector below the pipes if it is grounded starts better and the light is more equal to what tube length Formerly there were germicidal tubes (which are also UV, in this case UV-C) that had a strip of aluminum type albal paper, one cm. of width stuck along the tube and connected to ground, which solves the problem you have, as you talk about battery and there is no earth, it does the same thing that this pulls you connect to one of the terminals of the tube (in this case said lamina you can't touch it because it gives power), even an insulated cable that takes two or three turns around the tube from side to side of the tube and connected to one of the terminals of the tube can solve your problem.
202
hace 5 años
hace 5 años
try adjusting the VR1 potentiometer. previously, mark your current position.
470
hace 5 años
Now looking at the last photo with the light on I realized that the greatest radiation is obtained from the upper tube and towards the end (on the right) it looks redder the same as the lower tube but a little dimmer. And if we see the center of both tubes it is seen that the radiation is much lower (less red), and that condition is exactly what happens, the resin heals faster in the red zone. Then the problem is that the gas only condenses on the right end of the lamp and the rest practically nothing. Here is a problem with some component
202
hace 5 años
Then, done that, measure how many volts reach the tubes and how many would work according to the specification of the tubes. Follow the lines that feed them and find out where the current minimizes. One more question: Does that device not have a cone-shaped capacitor like the old incandecent tubes that were replaced by the saving lamps?
470
hace 5 años
As seen in the photos, there is no cone capacitor, they are cylindrical. But today I knew something, that circuit is a first-generation electronic ballast, there are two in a single plate.
The transformers convert the current of 12v DC to voltage x into AC, it contains a protection circuit for oscillating current or in the case that a tube burns, rectification diodes, resistance ... etc. I haven't had time to review each component for the end of the year theme. Tomorrow head I get yes or yes, thanks
470
hace 5 años
hace 5 años
Well, try to repair it but in commerce they do not sell everything, the problem was the transformers and capacitors, they did not have the ability to reserve energy since the transformers send less than they support. So I couldn't fix it, the capacitors sell them, but the traffics don't. Maybe even the ballast was exhausted, but neither do they exist in the trade.
Finally, after searching the web, I found similar lamps that I adapted with a little ingenuity to what I had, and also works with 12v. (On ebay)
Thanks everyone for your help
regards
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