How a Vintage Analog Yamaha YC-25D Combo Organ Works: Inside, Walkthrough + Repair Tips!

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I had to do some repairs and servicing on my Yamaha YC-25D organ so I thought I'd make a video walkthrough of how it works and some common faults and places to start solving them!

When I first repaired my organ 5 years ago I didn't have access to the official service manual, so I had to make my own using the YC-45D combo organ's service manual for reference. Since then the YC-25D Service manual has become available for free on the internet it seems and it's super cool to see that my own version was VERY VERY close in accuracy to the real thing! You can download the relevant manuals here in the description and I hope you find this video useful for anyone who has a Yamaha YC or older analog Electone organ (which have a very similar circuit structure). Feel free to ask questions and I'll see how I can help, and if you found this video or my service manual helpful, feel free to leave a PayPal tip. It always helps:

Official YC-25D Service Manual:
https://anaphonic.com/wp-content/uplo...

My own supplementary YC-25D Service Manual to be used with the YC-45D Official Service Manual:
https://www.combo-organ.com/Schematic...

Official YC-45D Service Manual:
https://manuals.fdiskc.com/flat/Yamah...

Correction to Video Narration: when I mention "27 Volts" for the Master Oscillator, it should be "negative 26 Volts".

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