[sdiy] [OT] Yamaha PF-85 question

cheater00 . cheater00 at gmail.com
Fri Jul 10 10:01:13 CEST 2015

What does mushy mean? Do they get stuck?

In my fatar, there were metal pieces protruding into the key, to stop
it at the end of the travel. They had rubber coating. This rubber
swelled up and became thick enough that the keys got stuck.

On Sun, Jul 5, 2015 at 7:09 PM, Colin Hinz <lists at meccanion.com> wrote:
> I've got a (positively antique) Yamaha digital piano with a vexing
> problem: several keys have gone mushy, with no apparent cause.
> Presumably there's something amiss with the key return springs,
> but swapping springs with a good note just results in both keys
> being mushy!
> Given that this beast has almost no value at this point, I don't
> want to put huge amounts of time or money into it, but I'm
> loath to just throw away what could still be a working instrument.
> (I'm sure I'm not the only list member who's been in this
> position.)
> So, throwing this out to the list, anything simple I'm missing?
> The service manual just covers the electronics, the only page
> regarding the keyboard itself is the exploded parts diagram.
> And furthermore, as this is off-topic for synth-DIY, is there
> a more appropriate place to ask about this problem?
> Thanks for any insights, everyone.
> - Colin
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