Check the lost motion and the backchecking. Extra lost motion also means wide backchecking. Once you get the Aftertouch Equation sorted out (keyheight, keydip, lost motion, let-off), check the backchecking again. Backchecking that is too wide can give the symptoms you describe. Hammers should check about 12mm (1/2") from the string. This was a common problem with U1s straight from the box about 3 years ago. Hope this helps Z! Reinhardt RPT Ann Arbor MI diskladame@provide.net ----- Original Message ----- From: "Jay Mercier" <jaymercier@hotmail.com> To: <pianotech@ptg.org> Sent: Tuesday, February 05, 2002 4:31 AM Subject: Yamaha U1 - spongy, lack of repetition... List, The symptons include spongy keys, lack of repetition, and overall lack of control when playing fast runs. It's also difficult to feel aftertouch, even though it's there. A 1999 Yamaha U1, purchased brand new in the U.S., after customer complains I proceed to the following: 1. With all cabinetry in place, the keys stay up on the balance pins when lifted upwards. I eased the balance rail holes a bit. The keys no longer stay up. 2. I slightly weakened the damper springs. The symptons are as evident as ever. Do I try lubing the capstans, balance/front rail pins and key bushings with protek? Regulation looks good, very good & uniform. There is only slight excess lost motion. + + Excess lost motion usually means wide backchecking. Adjust the lost motion and see what that does to the backchecking. ++ The symptons get better with left pedal depressed. Any suggestions? Jay Mercier Associate member, Twin Cities Chapter PTG Glenwood, MN _________________________________________________________________ Join the world's largest e-mail service with MSN Hotmail. http://www.hotmail.com
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