I have a halogen transformer for a light. It does not work and I want to understand where it has broken down and address the issue. On a high level, it was plugged in to 220 volts when set to 110. However, it was designed to work @ 220 volts (when properly set). Over the past month and a half, I have studied the traces, ordered replacement parts, but the problem may very well be in the transformer (which I'd like to re-wrap as a project, if needed). Then again, the transformer only has 1 primary input.... I am at a loss as to what the circuit / traces are doing. Hard to stare at something for this long and come up puzzled, can someone get me unstuck?
The AC input - terminals L and N, goto fuse, then ac/dc bridge. The N terminal shoots past the bridge and to the 120/220 voltage selector wires - when the wires are shorted it sends power (110 volts) to 2 capacitors wired in opposite directions (why don't they blow up?) that meet up with the + and - side of the ac/dc bridge and 2 1/4 watt x 1M resistors. When the voltage selector wires are not shorted, the unit is in 220 volt mode...
After that, it seems to feed into some C5071 type things (transistors) which I have no idea... Finally, all that goes into the transformer - 2 small copper wires - I assume that is the primary. If it is AC or DC at this point - no idea. I thought DC...
Please explain what is happening when the voltage selector wires are shorted together and why having them open makes any bit of difference. What are the big orange Poly Capacitors for? What are the transistors for? Why are such little resistors ok? Is this transformer taking AC or DC? What is the lowest voltage I can test this transformer at? Why the green filter/coil looking thing? Winning Lottery numbers for next week
The 12 volts is used for the fan to keep the transistors cool. The LAMP output is 24 volts There is an unused 24 volt tap Bridge Diode Rectifier KBU808
Here are pics (please save them to your hard-disk and ask for more if desired) http://www.usbjunk.com/halogentransformer1-1.jpg http://www.usbjunk.com/halogentransformer1-2.jpg http://www.usbjunk.com/halogentransformer1-3.jpg http://www.usbjunk.com/halogentransformer1-4.jpg http://www.usbjunk.com/halogentransformer1-5.jpg http://www.usbjunk.com/halogentransformer1-6.jpg http://www.usbjunk.com/halogentransformer1-7.jpg http://www.usbjunk.com/halogentransformer1-8.jpg http://www.usbjunk.com/halogentransformer1-9.jpg
Many thanks for the sets of eyes