Hi Todd, The tuning stability problem sounds very bad, I have no doubt a new pin block may be require. But for what it is worth, I had an ultra unstable Yamaha, and it was caused by a seperation of the inner to outer rim. It may be worth a close look. Check the bearing carefully with a compound gauge, over the 2 week tuning period. Regards Roger At 02:08 PM 1/11/01 -0600, you wrote: >List, > >A fellow technician who is not subscribed has asked me to pass a >question on to you for your wisdom. Get your tissues out, it's a sad >story. > >My friend was called to service a Yamaha C7 at a church. He arrived on >Tuesday, and was told that the piano had been tuned on the previous >Friday (by a reputable tuner - tuner only, she doesn't do repair work - >that's why they called him). He checked it out and all the unisons from >about midrange to the top were out and the tuning was just awful! The >music minister said they've had it tuned every 2 weeks for the last 20 >years! They have never been happy with this piano and my friend was the >first to check the pinblock to flange fit. Sure enough - huge gap in >the treble section between the plate and pinblock. His question: Would >it be worth his time and their money to try shimming the pinblock? He >was really considering just sending it off to a rebuilder for a new >pinblock, as one of the previous quack techs who looked at it doped the >pinblock in hopes of solving the lack of tuning stability. Another sad >point is that he thinks it's out of warranty now, and for sure since the >pinblock has been doped the warranty is void anyway. If someone >competent had seen it early on, it could have been fixed by Yamaha at >their expense and saved this church tons of money in tuning fees over >the years. > >Any and all suggestions welcome. > >Todd L. Mapes >PTG Associate Member >Fort Smith, AR >
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