Hi Mike, I don't service very many Young Changs, but the basic regulation procedure should be about the same as any other brand. I'll give you my .02 worth and maybe it'll get you started. >I can see where the problem lies but am not quite sure what the cause >(or than manufacturer mishap) or what may be the best way to properly >regulate. The problem has to do with insufficient aftertouch. Hammers >have no let-off, drop, or checking for that matter unless a sharp >blow(test-blow strength) is used. I think this is explained as the felt >punchings are compressing enough on the hard blows to allow let-off and >drop to occur. Hammers are blocking against the strings on soft blows no >feel of let-off or drop or aftertouch in keystroke. First, have you tried adjusting the let-off? If there is none, first make sure you have some drop and then set the let-off. If for some reason there is no drop at all, that can fool you into thinking there is no let-off. If the hammer is actually blocking, though, there probably is *no* let-off. For a quick analysis, I think that's what I would do first. There are usually at least a *few* notes somewhere (usually the extremes) that will work app. correctly. Pull the action and play with the let-off and drop adjustments until you get something going, then put it back into the piano and refine the let-off. Pull the action again and refine the drop adjustment Insufficient aftertouch is *usually* caused by too little key dip (either the key height and/or key dip is incorrect) or the hammer blow is too great. If the dip is OK, then make your adjustments with let-off and blow adjustments first. Then if the aftertouch is still insufficient, raise the hammer line a little until you get the desired aftertouch. This could also be combined with *slight* adjustments in the key dip without making it too deep. >Key height is good, key dip is sufficient (as far as factory specs and >geometry go) blow distance is about 47 mm(which is good) let off is >high, no drop, unless front rail punchings are removed which seems to >(in reference to sharp dip) be too much. I don't want to increase the >dip by as much as the action is asking for because the sharps will be at >the same height as the naturals when depressed. I, personally, prefer to keep the key dip pretty standard and then adjust aftertouch by raising/lowering the hammer line. Most pianists will object if the dip is too deep and/or the sharp dip gets too close to the naturals. All of this assumes, of course, that the bore distance on the hammers is correct. >Now my questions are what is the best approach to proper regulation? >Would decreasing the blow distance to allow more aftertouch be wise or >would increasing the key dip be better. Any suggestions or comments are >appreciated. >Thanks in advance. > >Mike Masters I hope I haven't overlooked something and that this is some help. Good luck and let us know what you did. Avery ___________________________ Avery Todd, RPT Moores School of Music University of Houston Houston, TX 77204-4893 713-743-3226 atodd@uh.edu http://www.music.uh.edu/ MUSIC DEFINITIONS: Accidentals : the wrong notes.
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