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From: N_Cook on 15 Mar 2010 11:49
From being dropped. Can anyone point me to diagrams showing how these keys
are locked in place at the pivot, believed two pieces of plastic broken away
and missing and not knowing how to safely remove one of the other keys, to
inspect the arrangement, i'm at a bit of a loss. It has been used for some
time like that with only the top wooden plank and felt under keeping it in
place. It is in for electronic repair of a blown amplifier but may as well
do something with this key while it is all open.


From: neilish on 15 Mar 2010 20:07
On 15 Mar, 15:49, "N_Cook" <dive...(a)tcp.co.uk> wrote:
> From being dropped. Can anyone point me to diagrams showing how these keys
> are locked in place at the pivot, believed two pieces of plastic broken away
> and missing and not knowing how to safely remove one of the other keys, to
> inspect the arrangement, i'm at a bit of a loss. It has been used for some
> time like that with only the top wooden plank and felt under keeping it in
> place. It is in for electronic repair of a blown amplifier but may as well
> do something with this key while it is all open.

can't point you to a diagram but i can describe what yamaha usually do
to retain keys in (i'm asuming this is a weighted piano)
what i usually do is undo the screws holding the keyboard and slide it
forward about an inch
then bend over the piano and look underneath the keyboard from behind
the keys you might be able to see/feel little plastic tabs on the
bottom of the keys
lift the plastic key up with a small screwdriver and slide the key out
forwards
it should just come away assuming its the same as the other yamahas
ive done
all the best
the (ex)keyboard doctor
From: N_Cook on 16 Mar 2010 04:15
neilish <justneil64(a)hotmail.com> wrote in message
news:c62441f0-7a55-4438-8a0c-2ec0cf5c1639(a)e1g2000yqh.googlegroups.com...
> On 15 Mar, 15:49, "N_Cook" <dive...(a)tcp.co.uk> wrote:
> > From being dropped. Can anyone point me to diagrams showing how these
keys
> > are locked in place at the pivot, believed two pieces of plastic broken
away
> > and missing and not knowing how to safely remove one of the other keys,
to
> > inspect the arrangement, i'm at a bit of a loss. It has been used for
some
> > time like that with only the top wooden plank and felt under keeping it
in
> > place. It is in for electronic repair of a blown amplifier but may as
well
> > do something with this key while it is all open.
>
> can't point you to a diagram but i can describe what yamaha usually do
> to retain keys in (i'm asuming this is a weighted piano)
> what i usually do is undo the screws holding the keyboard and slide it
> forward about an inch
> then bend over the piano and look underneath the keyboard from behind
> the keys you might be able to see/feel little plastic tabs on the
> bottom of the keys
> lift the plastic key up with a small screwdriver and slide the key out
> forwards
> it should just come away assuming its the same as the other yamahas
> ive done
> all the best
> the (ex)keyboard doctor


The very top key was always a bit sticky (if i made it worse , the owner was
always compensated for this key) and as I could see the edge, removed that
one, quite painlessly. Screwdriver blade softened with some plumber's PTFE
tape under the top/rearmost projection (under the plank/felt)and lifted and
then slid forwards to remove. Draped some PTFE in the pivot area recess and
took a cast with epoxy that now seats in the broken one to make a reinforced
hotmelt glue fix to that one.
Anything special about the libricant at the plastic/plastic pivot , looks
like a green silicone paste

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://diverse.4mg.com/index.htm


From: N_Cook on 16 Mar 2010 11:04
Correct X,Y,Z position and action inditinguishable from the adjascent keys
and rubbing/stickey top one fixed at the same time


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