My greetings to all the ladies and gentlemen of this forum!
Last Thursday, I took my SX900 to the Yamaha service center in my city, so they could take a look at the problem of the noisy black keys. Upon arriving at this location the professionals refused to receive the SX900, claiming that this was not a defect and that the yamaha had changed its keys, to this new standard and this would be happening with several models. I argued that when buying the keyboard and when I tried it in a store, before buying, the SX900 did not have any abnormal noise on the keys and was shown to have very good quality keys, but the problem arises after use for more than 30 days, on average, characterizing this an addiction (long-term defect) in the structure of the new keys adopted by yamaha. Before heading to the technical assistance, I sent an email to Yamaha Musical do Brasil, which was answered almost automatically, saying that I would take the keyboard to the nearest authorized Yamaha service. When I was in technical assistance, I explained that this defect was happening with several SX900 keyboards in various parts of the world and contact was made with Yamaha Musical do Brasil, by phone, by one of the professionals, reporting the problem, and to to my surprise the brazilian Yamaha said that it was not aware of this problem and that i was the first person to seek technical assistance reporting this fact. The technical assistance recorded 2 videos showing the noise of the keys and said that it would send to Yamaha Brasil. They also took my phone number and said that "probably" Yamaha would call me, which so far has not. It already has several yamaha keyboards, including cheaper models like the PSR 540, and this is the first time I have bought a PSR with poor quality keys. A music colleague who bought an SX before me, has the same problem. I demand the exchange of all the keys, or replacement of the SX900 or I will file a lawsuit asking for my money back, because if I knew that the keyboard had this problem I would not have bought it. If you intend to buy a SX carefully, this defect will appear after you purchase it with use.
Enildo