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Subject: Re: [yamahacs80] Pressing the two "wah" buttons kills CS-80?

From: Tommy Priakos <tpriakos@...>
Date: 2005-07-19

I've done this before too, but my CS plays as per normal, as David was saying. Now, as for Wah functionality, that may be a different story, and perhaps the range of my wah/expression isn't like it used to be... A result of this "short", perhaps???  Or it could be the photocell in the Expression pedal too.
Tommy

David Rogoff <david@...> wrote:
h0merxxx wrote:

>I heard the rumor that if you press the two "wah" buttons (the two
>square grey once) simultaneous you blow the whole CS-80.
>Could anyone of you confirm this rumor because I found no clue
>regarding this in the manual.
>
>
> 
>
Well, I'm sure I've done this before, but I'll try it again when I get
home.  I just looked at the schematics
(http://www.synthfool.com/schematics/cs80_1.jpg): the switches (SW-9,
along the top of the schematic, about 3/4 toward the right) turn on FETs
that act as audio switches, turn on/off the output of the wah circuit or
the pre-wah signal.  The FETs' outputs are tied together, so if they're
both on there will be a short. I'm a little rusty on my transistor
theory, but I doubt this would hurt them.  It certainly wouldn't hurt
anything in the CS-80 beyond those two FETs.

David

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