nothing more technically advanced than your idea g but i reckon the timer reset
through some insignificant feature to keep her alive is the only way. keep her
lit.

gmeredith1 <gmeredith1@...> wrote: I
have been doing some testing and some research about this, and
have come to the conclusion that it is not possible to do this.

I have sought to bypass the APO signal line from the SK's processor
and connect an external 5V supply to the power circuit transistors
to keep the keyboard awake. I thought that this would do it, and now
the rest of the keyboard does stay powered up, but the processor
itself actually shuts itself down after 7 mins. The lights stay on,
but nobody's home. The keyboard will not operate.

Referring to the service manual, you can basically work out what
i've done. But I believe the processor itself has a timer in it that
is hard-wired internally in the chip that shuts itself off, no
matter what else goes on in the keyboard. That's a damn shame, I
really thought I was on to something.

I can pretty much assume that all other casio keyboards with the APO
feature will operate in the same way. I have a Casio DG20 digital
guitar which I tried it on, and it does the same thing.

There IS one way that you can work around this feature, and that is
to press any button or key on the keyboard every 6 or so minutes,
before the APO switches off. Knowing this, it should be able to make
a small timer circuit with a tiny relay or electronic switch that is
hotwired to some relatively unused function button on the keyboard,
that will do this automatically.

Anyone have anything to add to this?

Cheers, Graham






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