Begin forwarded message: > From: "Phil Glenn" <Phil@yca.tzo.com> > Date: Mon Jun 9, 2003 12:53:01 PM US/Central > To: <pianotech-owner@ptg.org> > Subject: [admin] RE: Young Chang Action Brackets > > Please post this reply. > > > Thanks, > Phil > > Thanks Avery, > > I'll answer each of your questions, though basically any YC > manufactured grand piano dating > from about 1990 to 1997 has the possibility of this occurring. If you > see anything that is weird or unstable, > then you'll probably need to exchange the brackets. It will usually > start to show up between two to five years from new. > Very rarely do you find any visual defect on the bracket itself. > > 1. What I DIDN'T see was everything I've read about it. I was able > to easily pull the action out; the drop screws didn't scrape on > the underside of the pin block, etc. > These severe symptoms only occur on very advance cases and not > always then. > The only predictable thing about the growing > brackets is that they are unpredictable... and the hammers > block. > > 2. Besides the blocking, all I could see was that the underside of > the drop screw was AWFULLY close to the front edge of the wippen > buckskin and the jacks were mostly WAY too far back under the > knuckle.> > As the brackets expand, it pulls the hammer rail away from the > wippen rail, > thus the jack is moved back from the roller. > > 3. Besides measuring the spread (which I don't know what it's supposed > to be) how can one know for sure?> > Measuring the spread is the only technical way to know, but > then the spread could be off for other reasons. > The affected pianos had a spread of 112.5 mm pre-1991 and > 113.5 mm post 1991. > It doesn't take much to make a huge difference (1 or 2 mm) > but, > I had a tech the other day tell me that the spread on his > piano was 119. > > 4. It's had water leak/damage in the middle and 1st treble section and > the strings and plate are rusty there. I can also see evidence of it > by stains on the action rails and a few of the shanks.> > Water damage could cause the keyframe to warp, imitating the > bracket symptoms, > though the spread shouldn't change. But... if your going to be > doing major work > to a piano within the affected range, you may as well throw in > a set of brackets. > > > 5. I just don't want to do the "growing action brackets" thing without > being sure. Any ideas how I can BE sure? Thanks.> > Thanks for your concern. As this is a major warranty > situation, we have a need > to keep expenses at a minimum. However, the customer is our > greatest responsibility. > We don't want unstable pianos in the field when there is a > very easy fix. > When in doubt, seek me out. > I receive a paycheck because I am here to help you. > > The pianotech list is a great tool and resource, I am sorry I can't > afford the time to monitor the internet each day, > but I do try and answer all of my e-mails every morning. > > Sincerely, > Phil B. Glenn, RPT > National Service Manager > Young Chang Acoustic Pianos > (800) 874-2880 x110 > Parts, Jim Davis x132 > > -----Original Message----- > From: pianotech-owner@ptg.org [mailto:pianotech-owner@ptg.org] > Sent: Monday, June 09, 2003 10:52 AM > To: Phil Glenn > Subject: Young Chang Action Brackets > > > You are not allowed to post to this mailing list, and your message has > been automatically rejected. If you think that your messages are > being rejected in error, contact the mailing list owner at > pianotech-owner@ptg.org. >
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