Touch Weight Too Heavy on MX100

[Roger Jolly]

Hi Richard,
                 It's a vertical model, HO,HO, HO. (smile)
Regards Roger                    


          
At 06:38 PM 09/12/99 +0100, you wrote:
>I dont recognize this model number.. but I assume its a small grand
diskplayer
>??
>
>If so.. it strikes me that these weight figures you report are not sooooo
>awfull that you couldnt bring them down to acceptables with a few good old
>standard tricks like reducing hammer weight a bit, and protecking the damper
>centers. That B7 is pretty darned high but there is usually some easy to fix
>cause for the occasional way out of limits key.
>
>I'd first try a few spot checks to see what you can do with regulating and
>hammer weight. Check the geometry as well, but you know all that. As for the
>friction.. almost looks like you got to little in a few places.. or what ??
>Does the action play kinda sloppy ??
>
>Richard Brekne
>I.C.P.T.G.  N.P.T.F.
>Bergen, Norway
>
>Tom Cole wrote:
>
>> Dear List,
>>
>> I tuned a Yamaha MX100A (1988) today that had a touchweight problem I
>> found curious. It was the first thing the customer remarked about so I
>> did some investigation.
>>
>> I noticed right away that the dampers picked up early but, with the
>> dampers picked up by the pedal, the up and down weights were too high as
>> well.
>>
>>   NOTE  DW      UW
>>
>>         C2      53      34
>>         C3      57      36
>>         C4      60      36
>>         C5      64      38
>>         C6      62      38
>>         C7      62      39
>>         B7      75      41      (C8 felt like it had a mechanical problem)
>>
>> There doesn't seem to be a friction problem and so the simple solution
>> would seem to be to put lead weights in the keys to bring the
>> touchweight down but I've never seen a Yamaha that was so out of
>> regulation. Is there something about early Disklaviers that I need to
>> know? Could this particular instrument have come from the factory that
>> way?
>>
>> Unfortunately, I didn't think to pull out some key sticks to see if
>> someone had pulled out the key leads. I did glance down the side of some
>> Bs and Es in the bass to check for key leads and didn't see any nor any
>> empty holes.
>>
>> The present owner bought it 3 years ago and the touch was heavy when she
>> first got it. So far, two technicians have not been able to help her
>> out, one of whom was a Yamaha tech.
>>
>> Thought I'd run it by the list before getting the lead out. Can anyone
>> comment on this weighty subject?
>>
>> Tom
>> --
>> Thomas A. Cole, RPT
>> Santa Cruz, CA
>> mailto:tcole@cruzio.com
> 
Roger Jolly
Saskatoon, Canada.
306-665-0213
Fax 652-0505