Andr=E9 writes: Hello David, I have replaced an awful lot of Yamaha keyboards because = I work free lance for Yamaha in the Netherlands. I can be brief for the moment (if a more detailed story is needed, = tell me): Replacement of the C7 keyboard id not an easy one because of the = length of the keys. You must take into account the measure Yamaha gives for key height = (from the table to the underside of the key covering (Ivorite), this = is 64 mm. If you want to do a perfect job, it means taking a long time for the = keyboard, a long time for regulation plus a complete tuning and = voicing. A Yamaha C7 takes me about 5-6 hours. This includes total! = regulation, tuning, filing hammers (with the shoe shine technique) = and complete voicing. Don't underestimate the downbearing weight and regulation of the key = frame, and do not forget the backchecks. It is a lot of work, but fun. David writes: > >Dear List, > >I am going to replace a set of keys in a Yamaha C7 in a couple >of weeks. This is Yamaha's preferred method of replacing >the first generation of Ivorite keytops that have yellowed. My >request is for any advice on what I will run into in this >procedure as it is my first. My likely order of work will be: >#1 Take a lot of measurements of original keys and action such > key height, dip, height of key lifter felts, blow distance, > checking distance etc. and record them >#2 Remove stack and install new keys #1 & #88 and reinstall > stack. Check for major changes in key height, damper lift etc.. >#3 Remove stack again and keys. Clean and polish keypins >#4 Install keys, easing etc. >#5 Rough regulate hammer shanks off rest rail if this has changed >#6 Fine regulate key level to specs taken >#7 Rough regulate blow distance and backchecks >#8 Rough regulate dip >#9 Fine regulate damper lift with key and pedal >#10 Go through and fine regulate action > >Question? I don't think this will effect most regulation other >than dip, key height, backchecks and damper lift. Is this >right? > >Question? How long has this taken other technicians who have >replaced a Yamaha keyboard? I'm figuring 5 to 6 hours... > >ilvey, RPT >Pacifica, CA > friendly greetings from: Andr=E9 Oorebeek CONCERT PIANO SERVICE Amsterdam, the Netherlands email: oorebeek@euronet.nl =83 where MUSIC is no harm can be =83
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