Disklavier

Hi Kevin,

I currently have a Yamaha GranTouch GT1 which I am happy with.

Years ago I had a Glubransen Organ Model G-3.

When it was turned on in standby or I would play it, it would buzz too.

What I discovered is that some of the components, i.e. condensers, 
capacitors,
etc. where physically touching the circuit boards and actually causing 
the buzz.

If possible, get under the keys and get one of your ears to scan all over
the circuit boards while the piano is on to see if you can actually hear
where the buzzes are coming from as you pass by each component.

Then with the power off, I gently and very carefully, lifted where
possible, offending components slightly away from the circuit
boards or wrapped them with felt

When I powered the organ back on the buzz was gone and the organ played 
well.

If there are still a few buzzes, then revisit where the buzzes are coming
from with your ear and lift the offending component(s) a little bit more
or apply or reposition the felt.

Of course, resistors and some components, unless they have long enough 
leads,
you don't want to try to lift them up off the circuit boards as they 
will break.

Unless the screws are very lose on the circuit boards, I don't
think over tightening them is going to solve the buzz problem.

I can't tell if you have a similar situation here or
advise you to try what I tried, it's just a thought.

DNA

Portland, Maine, USA


On 8/6/2019 5:06 PM, Kevin Farnsworth evkinfarns@... 
[disklavier] wrote:
> Thank you for getting back to me Carol
>
> I put the credit card towards the mid to top range of keys. Under the 
> keys are a couple of credit-card sized circuit-boards (with various 
> chips and resistors soldered into them). What I manage to do with the 
> credit card is simple make contact with the circuit-board under the 
> keys and this stops the buzzing noise - even once the credit card is 
> removed - but only temporarily. It always returns.
>
> After stripping down the keys I found that each of the circuit boards 
> is screwed down by four screws - which can of course be tightened. My 
> problem is that I don't want to over-tighten these and end up 
> destroying the circuit board. I'm also not sure whether there is more 
> to it than this?
>
> I'm surprised no one else has encountered this issue. It is the only 
> problem I have with the piano which is otherwise great.
>
> Thanks
> Kevin
> 



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