Can I FIX this 1980s Synth / Keyboard Beauty?

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Hi, in this video I attempt to fix a beautiful 1988 Yamaha PortaSound PSS-680. This thing has it all, synthesizer, drum kit, you name it, this has it. Purchased from eBay for a mere £30, it was listed as no power, not working with batteries or the power supply.
Can it be fixed and work as intended once again? Let's find out.

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Remember that this is just for entertainment and I am not an expert in these repairs. The processes in the video may not be the best way, the correct way or the safest way to fix these things. I do love fault finding and trying to fix broken things, so I hope that comes across in this 'Trying to FIX' series. Many thanks, Vince.

Видео Can I FIX this 1980s Synth / Keyboard Beauty? канала My Mate VINCE