Edit - Solved! Bad shift registers were the cause. Still looking for schematics, though.

Many thanks for thatRasputin wrote:Here's another quite hard to find:
Yamaha FS1R Service Manual including Schematics...
Wow, thanks so much for that info. As you say, pretty hard to come by...although sadly there's no schematic for the display board in amongst that lot. I was hoping to lookup the vol & data slider pot values in order to replace mine, unless I missed it??Rasputin wrote:Ensoniq VFX, VFX-SD, SD-1:
Service Manual
Ensoniq - Service Bulletin #13 (keyboard problems)
Schematics
These are pretty hard to come by, so I'd archive them while they're available.
As far as I can remember, it should be a 10k linear (sometimes called type 'B') slide potentiometer. Should be 60mm long with a 15mm shaft and 45mm travel. The Volume and Data pots should be the same.Lozzy_uk wrote:I was hoping to lookup the vol & data slider pot values in order to replace mine, unless I missed it??
Yea, the ruler bit I can do, but measuring in circuit gives 3k so it has to come out for that, and I'd rather not until the new one's ready to go in. Hence the question. But if you say 10k lin, sounds probably right to me based on my measurement.Rasputin wrote: As far as I can remember, it should be a 10k linear (sometimes called type 'B') slide potentiometer. Should be 60mm long with a 15mm shaft and 45mm travel. The Volume and Data pots should be the same.
But it's simple enough to double-check all this yourself. Not really something needing schematics, a ruler and multimeter would suffice.
Amen, JoJo. Fly free vintage audio information! Here it is, complete with schematics:ʝɵʝɵ wrote:Anyone got the Kurzweil K2500 service manual? It's on Scribd but I don't see why I should be paying for downloading a document that doesn't even belong to them.
http://www.musicparts.com/products.asp?Company=E-Muczery wrote:Does anyone have the schematic / service manual for the original E-Mu Proteus 1 / 2 sound module? I guess there's not much interest in this kind of "obsolete" sampler technology.
I see. Fortunately, I was able to diagnose my problem with a little reverse engineering. Thanks for all your efforts to archiving these vintage manuals (and your generous attempt to purchase this book on behalf of the public good).Rasputin wrote:http://www.musicparts.com/products.asp?Company=E-Muczery wrote:Does anyone have the schematic / service manual for the original E-Mu Proteus 1 / 2 sound module? I guess there's not much interest in this kind of "obsolete" sampler technology.
The good news is it exists. The bad news is that it's not "in the wild", so to speak. I tried to organize a group buy for items like this, but... well, you know.
On one hand, I get that it takes money and effort to obtain the service manual and scan it in (been there, done that, got the t-shirt), but on the other hand, it's not as if anyone has a right to sell PDFs or even photocopies of these. It's extra laughable that people are trying to sell PDFs that are less than 100 DPI and barely legible for like $35.czery wrote:That being said, I am extremely disappointed how a few individuals have decided to not only withhold said information and even put up pay-walls to access information to what I think should be made publicly available. In the case of the Proteus 1 - E-mu is no longer servicing these synths and I doubt E-mu has any important intellectual property vested in the operation of its obsolete 80s sampling technology. I cannot find a good reason for such a service manual to be withheld.