CP 70-80 regulation specs./Isaac

[Isaac sur Noos]

Hi , thanks, Joe,

did you recover the hammers ?

I have the Yamaha parts list for CP 70-80 and the hammer seem to be
sold in complete unit, no reference for the covering, that semm a
little unusual for Yamahas.

There are 4 or 5 differnt kind of hammer assembly in the same
instrument, but I am not persuaded we may taper the letoff as much as
1.5 in the treble (I've heard of broken strings also on those, and I
have a gut feel that letoff may be a tad far to be good for Jazz and
R'n R'<G>

I've find the manual on line too.
I believe that Yamaha grand rollers and backcheks are also artificial
leather (and a very good one at that)

Not cheap when they sell it for covering backchecks , for instance.

I guess the tool you had to make was for the dampers lift , the action
can't be extracted like for a normal grand is not it ?

I tuned this CP80 in a noisy hall with the VT 100 and the tuning fall
in place marvelously well (an amazing tenth's progression for that
kind of beast).
Never heard such clean chords on that kind of piano (I remember trying
to tune 6:3 octaves in the bass ... a poem !)

best regards.
Have a nice week

Isaac OLEG





------------------------------------
PianoTech
Isaac OLEG
accordeur - reparateur - concert
oleg-i@noos.fr
17 rue de Choisy
94400 Vitry sur Seine
tel: 033 01 47 18 06 98
fax: 033 01 47 18 06 90
mobile: 033 06 60 42 58 77
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> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Joseph Garrett
> Envoyé : dimanche 2 novembre 2003 19:36
> À : pianotech@ptg.org
> Objet : Re: CP 70-80 regulation specs./Isaac
>
>
> Isaac asked: "Hello, list and listeners ,
>
> Can someone give me a basic regulation specs for these Yamaha grand
> electric pianos (key height-dip, letoff, stroke).
>
> I wonder also if the hammer covering is leather or corfoam,
> as used on
> other yamaha "leather" parts (If I am not wrong on that one !)"
>
> Thanks
>
> Isaac OLEG
>
>
> Isaac,
> Juuuussst happen to have a manual!<G> The manual says that
> the hammer
> covering is "Rubber (urethane)(under-covering) + artificial
> leather". I
> suspect that it is NOT Corfam, but something else. I have a
> bunch of it in
> stock, as I rebuilt a CP-70, several years ago. It is still
> pliable and very
> useable.
> Specs.:
> 1. Dip: 10mm
> 2. Key height: "surface of white key - 64mm from shelf.
> Black key - 12mm
> from the white key."
> 3. "Adjustment of up and downward movement of jack (to
> knuckle): 0.1mm -
> 0.2mm
> 4. Blow Distance: 40mm
> 5. Let off:  Bass: 2.5mm
>                 Middle: 2.0mm
>                 Upper Treble: 1.5mm
> 6. Damper lift: 1/3 to 1/2 of blow distance. (These are my notations
> garnered during regulation.)
> 7.Drop: 2mm
> 8. Checking: Bass: 14mm
>                    Middle: 13mm
>                    Upper Treble: 12mm
> It should be noted that some adjustments must be done with
> the top action
> removed, while others are done "....with the upper unit
> raised". Many can be
> done with the unit complete. I found that I had to make
> some special tools
> to go down between the strings to set the parts to specs.
> I'll see if my
> scanner will do it's thing.<G> I'll send that in a separate post.
> Best Regards,
> Joe Garrett, RPT, (Oregon)
> Captain, Tool Police
> Squares Are I
> P.S.
> I just found a "cheat sheet" of the actual measurements
> that worked!<G>
> DW: Bass: 52g  Treble: 40g
> Key height: 66mm
> Hammer Blow: 45mm
> Let-off: 2mm
> Dip: 9.66mm
> Check: 15mm
>
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