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Hi Tim Thanks for the advice. Moving cards might be a way forward. Will give it a go. yamahacs80@...> wrote:

Hi Bob?You bought a part from me a while back....80% chance there's nothing wrong with the supply at all.?I assume you've thoroughly investigated visual possibilities on the 2 offending voice cards,

OK... so I'm going to build a power soak to try and pin this down. ie. whether it is actually the PSU or if it's something elsewhere causing the issue. Measuring about 0.6A on the +15V, and 0.65A on

Hi Still having issues with this CS50 PSU. I've got a horrible high pitched whine all over everything. If I turn the amps off, I can actually hear this noise emanating from the PSU. If I put a

All, After many years of lurking I'm making my first post... With all the seasons that life brings my grand plans to restore a CS60 (no legs or lid) came to nought and I have to dispose of it due to

Hello Mike, Actually i've been reading about -6.5v/+8.5v (1/0) process almost everywhere in the manuals, and precisely this is what pushed me to really check the KAS LSI's, when i realized my

Thank you Crow, actually i did mention that one in my sources for collecting infos, but indeed i didnt go thru all the detailed explanations about the LSI's functions...It is true that i opted for a

What is your objective here?? I've had a few of them fail on me.? The most common symptom of failure is the top octave not responding.? -Mikehttp://borishelectronics.com

There is a complete analysis of the custom chips in the Yamaha CS Servicing Guide. I used this book to work out IG series equivalent circuits a dozen or so years back. It covers the YM parts too.

Hello CS80 users, Probably as most CS80 owners, i am aware that the most critical parts in the beast are the 2 main LSI's (YM26600&Ym26700), as their failure could quickly become problematic,

Hi all! Can somebody tell me how the pitch ribbon works on the CS-80? I mean does it output variable resistance or how is it made. I would like to use one for a CS-80 related project. There are new

Thank you Tim, indeed it may be interesting.For now i found only 2 IC damaged, but if i find more than that in the end ,i will let you know :-) Regards

Hi If you're interested I have a voice card for the cs80 listed on e-bay and it's guaranteed to work. Tim

Thank you Joachim for such precise explanations, i couldnt expect that much:-) Now i understand more the meaning of the 'pronouncing mode' mentionned in the pin terminal description of LSI

I just read the post of David you mention. By a "jumper" I think he did not mean a physical jumper, but a wire to be added between +8.5 and the resistor at pin40 of IC1 (YM26600). By the way, beware

Oh btw Joachim, i think you did a great job with the interactive diagram about the CS80, congrats and thank you for this! Cheers

Hello Joachim, Thank you for those explanations. Indeed, i forgot about the +rail voltage.But i guess i can adress that with some cardboard put between the rail and the tail connection of the

Hi, Don't forget that the lower rail on which the boards are screwed is at a voltage of +15V ! If what you want is only to no longer listen to this voice board, why not just unsolder its output O (33)

Hello everybody, Does anybody have a safely procedure about how to disconnect a M board from the whole CS80 system? I think i have identified a bad IC on one voicecard, but before having

There is nothing between the SH and M but a wire. Output K1 of SH board is bound to the K input of M11 and an other wire goes from there to the K input of M21. So most certainly, the issue does not