Hi there, I’m Ron, and I am a factory certified musical instrument technician. I see you’re having some problems with your Yamaha.. I think I can help you, as I have over 50 years of experience in this area and have helped hundreds of musicians with their problems. Give me a few minutes to look up some information and I will get back to you. If you can give me your ZIP code I will see who is in that area for service.
Is it an upright or a grand style?
Does the unit light up or show any activity at all?
Look at the area where the power cord goes in. See if there is a fuse there, it would be marked fuse some pop out and others have a cap that you push and twist. If it is there try replacing the fuse. Some units had a fuse there and some had the fuses internal which requires removal of the unit.
The Yamaha units are built with compact computer board and are not serviceable by the customers. As a rule when you have a bad board it is completely replaced with another. Those have to be ordered from Yamaha by an authorized service tech. With that in mind there is not anything you can do except check the cords and a fuse if it is present. I'm sorry to have to tell you this , there is no other option.
There is a Yamaha authorized service center about 17 miles away. It is.
All Country Organ Service
Waterford Mi. 48329
I hope this has helped and if you have any additional problems, or would like any additional information or assistance, please do not hesitate to let me know.
And if you can take a second to rate my service by clicking one of the stars at the top of the page, then submit, that would be greatly appreciated.