If each key had one ‘switch’ there is no way or mechanism for the electronics to know how hard the key is being struck. The problem is that dirt had made its way under the electrical contacts that sensed when a key is pressed, and this needed to be cleaned to remedy the problem. Possible Solution – Some keys sound louder than others on Yamaha Clavinova Digital Piano: (I had to fix a couple of things the tech missed–even after his second trip out!) If you don’t have significant experience with electronic and/or electromechanical equipment, then the answer is “no–don’t try it.”–call a qualified tech who has done a few of them.
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I don’t know if I can recite exactly how to do the job without actually re-doing it myself, but I know there are some things to watch out for. Now that I know how it’s done, I’d do it in a heartbeat. I had a 37-year career in business machine field service (now ‘retired’), and I didn’t want to tackle it–mostly because I didn’t know how to get the case off, and I didn’t want to gouge up the exterior. If you have extensive experience working on computers, ATMs, electronic business equipment, or similar, the answer is yeah–BUT you have to be careful not to cause collateral issues, which is easy to do. But, I’ve been a tech all my life… You may call my cell phone (81) if you want. Disassembly / reassembly is tricky, but, after watching someone qualified do it, I could repeat the process. My tech pinched a couple of wires when reassembling the first time, then left a cable disconnected the second time. After cleaning, each module should be blown out with canned air to purge any tiny fibers left over from cleaning. (There are four or five modules.) We used Q-Tips, if I remember correctly. The fix is to disassemble the keyboard to the point that the keyboard contact ‘modules’ underneath can be removed, opened up, and cleaned. Evidently, a bit of corrosion, film, etc., happens in the sealed area of the contact pads, and messes up the timing between contacts. The volume of a pressed key on the keyboard is determined by the number of milliseconds (ms) between the first and second contacts of a pair of electrical contact “pads” against the runs on a circuit board below the pads: less ms (i.e.: the harder the key is pressed), the louder the tone, and conversely.
Very clever–and very reliable! Anyway, the next time this happens, I’ll be able to do the repair myself. I found out that the keyboard attack function is controlled by the time interval between when the first contact makes and when the second contact makes during a given key depression. The technician came out, removed the keyboard, disassembled the contact boards from the bottom of the keyboard unit, and cleaned all the copper runs on the board, as well as all the carbon buttons inside the rubber membrane. If you live in a city, probably getting it repaired is easier and more affordable.įixing the loud-sounding notes on the Yamaha Clavinova CVPĪ few notes sound too loudly at times on my Yamaha Clavinova Digital Piano. It depends on how much the repair would cost. There are several videos that show you how to open the keys and clean it. If its only happening with one key in one or two octaves, it could also be a simple case of cleaning the key.
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Obviously a definitive diagnosis and repair estimate would require professional inspection, but it seems to me that a problem causing intermittent malfunction of the SAME E key in impliedly EVERY octave in a particular range “above middle C” on the keyboard is so specific that I can’t imagine a great many potential causes existing. You would need to get the keyboard repaired.” I recently say an ad for a used keyboard that said, “It’s a bargain price because the E keys above middle C work only sporadically. Should you buy a Low-Priced piano on which some of the keys work Sporadically? Bought a Low Priced Piano on Which Some of the Keys Work Sporadically?