On a high level, it was plugged in to 220 volts when set to 110.
ordered replacement parts
the problem may very well be in the transformer (which I'd like to re-wrap as a project, if needed).
why don't they blow up
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?
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With the link out, it is a full wave bridge rectifier, charges the capacitors to 154 volts from a 110VAC supply, total 308V. With the link in place, it is a voltage doubler. Doubling 220V makes a total of 616.
Ah yes the fuse was blown! It was also a 3 amp fuse, when the board calls for 2 amp. Another bad sign.I have put a 2 amp fuse in, applied 110 volts AC to this board and nothing happened. The lights in the house dimmed for a split second while the current rushed in, the fuse did not blow. The light bulb did not light. The bulb is good.
The replacement parts I ordered are everything on the board pretty much -
the Diodes test OK. That is, I get nothing on the volt meter when probes connected one way, and something registers when reversing.
The last piece is the C5071 transistors, replaced!
The transformer I would actually like to rewind if needed.
I think it would be a fun thing to do.
The parts are being replaced as they arrive. Therefore, pretty much everything will wind up being replaced and no need for the waste bin. Right?
That is, the C5071 transistors I connected 12 volts DC was getting 12 on the volt meter. Maybe that is a direct short?
I noticed these transitors although connected to the frame for heatsinks they had protective material between them. Does this mean the backs are live and I should not touch? The replacements have a black backing and feel more plastic than metal, is this possible?
Have not ordered the diodes, should I?
Ok now this scares me.
The freaking light bulb is only 24 volts!!! Perhaps this is a bust of energy to ignite the halogen gas on startup?
Understanding what you're saying and looking at the traces. With the link out (220 volt mode), only the bridge rectifier is active which adds 220uf to the other 220uf passing it on through to one C5071 transistor then my head starts to spin following what happens next.
When the link it together (110 volt mode), I still lose what happens. There is a trace from the N side of the AC input to the 220uf caps. Crazy stuff. I have note ventured too far into waves or clocks yet. Perhaps this is what I am missing and why it is not making sense. Thank you for your time and explanation.
Why are we at 308v now? That bulb is 24 volts! This 308v gets fed into the transformer? What is the purpose of the transformer then?
Why take such large inputs?
Why step them up?
How those big orange caps stop the transformer from seeing DC is something I'd like to learn I could use this idea in other things.