Apple IIe FRIED, hopefully not.

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Apple IIe FRIED, hopefully not.

Ok, first of all, I don't know what happened.
Now, recently I was checking out some of my old software, then I smelt something horrible. I noticed smoke was riding over my fingers. ????. Then I noticed the smoke was coming out of the ventilation on the left side of my apple IIe. I don't know what caused the problem, probably the PSU or something else, if anyone could help me, please do so.

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Power supply

This is starting to be a major concern on these 25+ year power supplies. The Electrolytic capacitors are starting to dry out. If you are handy with a soldering iron, it is a simple replacement procedure. When you open the power supply, it ought to be very evident the bad part.

If you don't feel confident doing this, then there is always Eb@y. There are several on there for sale all the time.

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Dried Capacitors

The ones next to the power resistors are often the first to go. If you don't know which ones are the power resistors, look for the ones with the toasted brown/black bits of circuit board under them Smile

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How do I tell whats dead?

I opened the PSU. I don't see anything burnt or screwed up. Is there another way to tell? And another thing, how do I know it was the capacitors that made it do that. Could something from the motherboard make it do that?

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Check the logic board, see if

Check the logic board, see if any of it's bits look messed up / burned / leaking.

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Checked

I checked and smelled my motherboard, nothing looks messed up or burnt. I tried turning the apple IIe on again with the power supply, it works but I bet eventually it would just mess up again. How do I tell whats messed up in PSU? Please respond if you know

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Hi, I recently replaced al

Hi,

I recently replaced all the electolytic and AC caps in a IIe psu. The first ones to go are the 0.47uF AC cap that sits across the AC supply rail - right near the power connector. Check the casing for signs of rupture - it is a rectangular yellow plastic - looks like resin. The other one that will go is the 0.1uF AC cap near it - another rectangular cased one.

I then replaced ALL the electolytic caps in the supply. I have photos of the procedure.

Dean

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