8000 MK1 speaker “fried” pls help test

[Christian Skina]

First, Im a 65 yo man, got some “electrotechnical” classes in secondary school (late 60s …) Im not knowledgeable but not an idiot, I got this far (dismantling the speaker) just by watching vids and support from AI.
If you can help, lower yourself to my level, thanks.

Beolab 8000 MK1 bought 20 years ago in the USA, moved to EU. Used it all this time with a transformer, speakers plugged in an extension. Last week I cleaned the house (I cleaned it before, thx) but when plugging in 1 speaker, by accident I did so in a 220 plug. And the speakers were not adapted, hence the transformer.
The red light still turns on.
I removed the parts, went to a specialized center here in the Netherlands (by bike). The conversation was friendly but hilarious. Maybe I’ll write a book on that…

Both the AI I consulted and videos I found, helped me understand 2 scenarios: 1) some little fuse is burned or 2) some bigger fuse is burned.
My question is, can someone point me to where I should measure to see that? I already have one of those small oscilloscopes(?) measuring thing but the guy at the repair center I visited was trying to sell me new speakers or, when I refused, to go home and clean the speaker because “the burned foam bla bla). Maybe he was right but Id like a second opinion.
Here’s the stuff I photographed. Help greatly appreciated, I love my speakers (and the music they help me listen to)

 

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[KolfMAKER]

Hi Christian,

The fact that the red LED still comes on is actually encouraging. If the main fuse had completely blown, I would normally expect the speaker to be completely dead.

Since the speaker was accidentally connected to 220V while still configured for 110V, I suspect the standby power supply may still be working, but another part of the power supply could have been damaged.

My suggestion would be to start with the basics:

• Check the mains fuse with a multimeter (power disconnected).
• Post clear photos of both sides of the power supply board.
• If you are comfortable using a multimeter, measure the secondary supply voltages coming from the power supply.

Also, did you hear a pop, smell anything burning, or see any smoke when it happened? And does the other speaker still work normally?

Those details may help narrow down the fault considerably.

Good luck, and don’t give up on them yet — the fact that the LED still lights up is a positive sign.

Location: The Netherlands

Favourite Product: BeoSound 9000

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[Christian Skina]

hello KolfMaker

and thanks for the reply! when one is in the dark, even hearing a voice is reassuring.
Answers:
didnt hear pop, saw smoke and just sniffed around, doesnt smell of burned electronics.
I didnt try the speakers just yet but got them out, vacuumed the dead foam and they look very well there.
I attach here the images you suggested, I hope they’re clear enough. If you mean I should measure smth, pls try to describe which points. If that helps, I could mark each one with a number, in the pix.
I also attach a pic of the thing I have to measure “life”. Pls excuse the mess around the parts themselves, Im a painter and my house is a mess…

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[Christian Skina]

rest of pix

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