SY77/SY99 Floppy Drive Belt Replacement Guide

The Yamaha SY99 is a synthesiser combining frequency modulation synthesis (branded as Advanced FM) and sample-based synthesis (branded as Advanced Wave Memory 2) and the direct successor to Yamaha's SY77/TG77

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Derek
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SY77/SY99 Floppy Drive Belt Replacement Guide

Unread post by Derek » Tue Nov 13, 2012 11:23 pm

Hi,

Whilst replacing the failed floppy drive belt on my SY99, I took some pictures and wrote a quick guide, which I hope may be of some use to others. It's quite an easy job once you have the belt!

You can find the guide on the following page of my xfactory-librarians web site.

http://www.xfactory-librarians.co.uk/guides.html
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Derek Cook

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Re: SY77/SY99 Floppy Drive Belt Replacement Guide

Unread post by Saul » Thu Dec 06, 2012 11:57 am

Bit late but was just going through unanswered posts and wanted to say thanks for posting this :)
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Re: SY77/SY99 Floppy Drive Belt Replacement Guide

Unread post by Clyde » Thu Dec 06, 2012 1:46 pm

Derek, this will surely help those first time belt changers, thanks for posting it! I've done it enough times on both the 77 and 99 that I could do it blindfolded I think.
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Re: SY77/SY99 Floppy Drive Belt Replacement Guide

Unread post by Derek » Thu Dec 06, 2012 7:47 pm

I've done it twice now! :)

Display upgrades for the TG77 and SY99 are looming. I have all the bits now....
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Re: SY77/SY99 Floppy Drive Belt Replacement Guide

Unread post by rusty-m » Wed Jul 10, 2013 6:50 pm

Thank you Derek for the tutorial!
I thought it was much more difficult than the real thing, without it, I would still have the unusable floppy (last year was still working, and I bought it in 1993!).

Actually, I wanted to see if floppy was working just with a common rubber band, and, strangely enough, it was!
At first attempt, drive was spinning, but it couldn't read the disk, so I took a looser band enough to strain not the gear, and voilà!

I made a paper gasket (but could have been of plastic) for the motor mast to prevent band to go out of the groove, and added a second band around the floppy gear to create a "virtual" groove for the first (so actually the gasket seems to be redundant).

Since then, I formatted 10 times a disk, loaded all SY99 sounds that I got, copied 1 disk, and everything seems ok, no strange noise (actually, it always was, like every floppy drive!).

Now my SY99 seems to work like the first day.

https://docs.google.com/file/d/0BwRGDlj ... sp=sharing

https://docs.google.com/file/d/0BwRGDlj ... sp=sharing

[Moderation: removed non-functional [img] tags]
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Re: SY77/SY99 Floppy Drive Belt Replacement Guide

Unread post by Derek » Wed Jul 10, 2013 10:02 pm

I'm glad the tutorial helped. Some people have had success with elastic bands, and it appears so have you! :) But I'd prefer to use the proper belt which will provide the right tension. I've done this fix on both the SY77 I owned, but sold, and on my SY99.
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Re: SY77/SY99 Floppy Drive Belt Replacement Guide

Unread post by rusty-m » Fri Jul 12, 2013 1:53 pm

You're right Derek, elastic band is not the proper way to fix the drive, and it should be replaced by the original belt, and I'll do it in future.
I just have to record songs from some diskette I did in past, and probably I'll freeze the machine again.

I have also other questions and doubts about the SY99 maintenance, but I'll post them in the proper section.
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