wrote in message
...

I'm a little green on keyboards so I don't know if this is a weird probem
or what, I find it insteresting though.

When you play F sharp it also plays F.
When you play A sharp it also plays A.
When you play D it also plays D flat.

This is on all octavs both upper and lower, BUT not the pedals. Also on the
lower board these keys sometimes repeat themselves. Also on the lower if you
play the A sharp and the F sharp together they kinda appregriate. (sp)

Any ideas ? Since it is all octaves I am thinking maybe the micro or some
little diopdes near it, or do these things have a chip in between the board
and the micro to scan it ? And possibly the pedals are a different system so
they are unaffected ? I think it only has like 14 keys or something like
that down there.



Don't try and overcomplicate the problem. Think Occam's Razor. (Google
that if you're not familiar)

The keyboard is scanned in rows and columns. So you have a 2D grid where
each key will uniquely connect one row with one column (via a diode on each
key)

What tends to happen, in the real world, is that stuff gets dropped down
into the keys and onto the key contact PCB. Beer, sweat, other bodily
fluids etc. Yuk.
This often results in some of these rows and columns being shorted together.
Which might explain why your F key also plays an F# etc.

Take out the keyboard contact PCB, and you will probably find it is full of
****e and corroded to f@@k, and that one of those corrosions is causing a
short between one of those row and column lines, thus the F and F# keys are
shorted together. It doesn't even need to be a short, just enough to
cause the scanning IC to decide 1 or 0 in error.



Gareth.