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YAMAHA CP 10 mod/bend help
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nvaeth



Joined: Jan 25, 2009
Posts: 1
Location: Penn

PostPosted: Sun Jan 25, 2009 5:38 pm    Post subject: YAMAHA CP 10 mod/bend help
Subject description: bypassing the piano decay for an organ sound
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I just posted in the bending forum then realized this is probably a more appropriate place to post about this, so sorry for the redundance..

Hi, this is my first post on this site so bear with me here...I just bought a Yamaha CP10 electric piano from a craigslist fellow. it works great but i am sort of bored of its basic features already. I have already modded the tremolo so i can adjust depth and speed (it used to be only speed).


my next mission is to bypass the decay for the piano tone, so that when a note is held, it is at a constant volume (like an organ) rather than decaying like a piano. I am assuming the decay is made possible by additional circuitry in the piano so if i were to bypass the circuitry i could achieve the desired effect.


after much examination of the block diagram and the physical board it self, I believe getting rid of the decay has something to do with the 4016 quad bilateral switch IC. but I haven't gotten much past that yet...


SO my questions are:

would removing power from the 4016 do the trick?

- how can i identify the decay circuit (what are common types of decay circuits)?

- AND is the idea of bypassing the decay feasible or possible?


has anyone done a project like this on their instrument before?


Also, any other mod/bending suggestions for this piano?



the thing is that I have no schematic (if anyone has one please let me know i don't want to pay 30 bucks for it on ebay)...

thanks for reading!...
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seraph
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Joined: Jun 21, 2003
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PostPosted: Mon Jan 26, 2009 2:45 am    Post subject: Re: YAMAHA CP 10 mod/bend help
Subject description: bypassing the piano decay for an organ sound
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nvaeth wrote:
I just posted in the bending forum then realized this is probably a more appropriate place to post about this, so sorry for the redundance..


Hi nvaeth
welcome to electro-music.com

Very Happy

don't worry about redundance, I deleted your double post

Wink

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scoob



Joined: Nov 04, 2015
Posts: 1
Location: Philly

PostPosted: Wed Nov 04, 2015 6:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

BUMP to this nearly 7 year old thread.

Hi all, and nvaeth if you're out there. I may have ended up with your CP10 because it has the decay/sustain mod you mentioned trying (and I got it in PA).

I was wondering how this mod was done, if you or anyone could shed some light on it. It sounds incredible, and I want to try it on another CP10. Not only is the decay parameter gone, giving it a cool "gate" synth envelope, the output is boosted, and the resulting subtle saturation/distortion is fantastic. Note: I saw it uses JRC4558 op amps which are prized by many guitarists as being the best sounding.

I haven't been able to find CP10 schematics or service manual; the closest I've found is a CP11 service manual, but after poking around in the CP10 I can see it's considerably different.

So back to guesswork, before I stumbled on this thread I came to the conclusion, like you, that it's the Toshiba TC4016BP that can effect the mod. But without a circuit diagram I don't want to start shooting in the dark. More than that, I want to figure out how to to do the output boost because, like I said, it really makes this thing come alive.

I also want to add, I compared the modded CP10 to the stock one as closely as possible, and for the life of me I can't see any signs of tampering (no awkward resistors & caps thrown in, no sloppy solder joints, or any of the tell-tale signs) so whoever did this mod did a great job. Furthermore, since there are no obvious signs of construction, you'd think the mod is relatively simple to do.
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