Hey guys,
Unfortunately this issue came back to me. I would seek your fresh advice (in addition to call Yamaha technician which will come in a couple of days) on this as I feel like I'm missing something very obvious. If you just can read the information and suggest something to try or to check that would be great!
Appearance. It started ~4 months ago when I started getting a message on the PRC control "Key drive temperature is high". At the moment manual checks for the temperature of the solenoid rail didn't show any abnormal spots. When that message appeared initially and after about 2 weeks everything worked perfectly. Then suddenly the natural playback stopped working - at the same time the pedals and the MIDI playback worked fine. When I say stop working - I mean only the solenoids stopped pressing the keys.
Progress. I was looking for a Yamaha technician for some time and during that period the message on the PRC changed to "Key drive disconnected". I tried to re-flash the firmware of the MARK iV - it didn't help. Still MIDI and pedals worked well. But then I accidentally recorded a normal play (not with headphones attached) but without pressing the pedals. And the piano played back the real keys nicely. I then re-calibrated the pedals and for the whole day the piano was in a perfect condition - it played all the songs and recordings on a real piano perfectly
Second fail. But the next day the message "Key drive disconnected" appeared again on the PRC (when I start the app and press Switch On the disklavier). If i don't do anything with the piano the message appear in about 10 sec after starting from the stand by mode. When I play a recorded song the only pedals are working. But suddenly (when I waited a bit longer) I realised that some buttons are moved for a about 1-3 mm. But not all of them. And not all the time. One button (in the bass) was almost hit the whole height but still no sound produced. Re-calibrating the pedals didn't work anymore this time (looks like it was a coincidence the previous time)
Yesterday. I tried to check the connections to the solenoids thinking that it could have been an issue there. But I have to say this connection is the worst part of the disklavier - there is a hole in the top of the CSP unit and the cables go directly from its motherboard to the solenoids in the top rail through another hole. I had to disassemble them both together as there is no way to disconnect cables without unscrew the rail. Anyway - I could not find any loose connections and assemble everything back for the moment.
Question. Any idea what could happen? Faulty solenoid? Not enough power for them? Any process to diagnose solenoids? Or anything else?
Appreciate you time reading this so far :) Would consider any advice what I can check as I still think the technician might not have all the information to do that on the spot.
Thank you,
Dmitry
On 22 June 2017 at 03:02, Dmitry <dmitryos@...> wrote:
Hi guys,Just in case it might be useful one day to someone. I was able to "fix" the issue by re-calibrating the pedal. Last time when technician finished the maintenance he told me he slightly adjusted the pedal position. I didn't pay much attention to it and forgot about this. Today when I was recording myself in the headphones I was able to reproduce my recording without a problem (as the pedal was not moving during the playback). It came to my mind to try to record the real keys without pressing the pedal. And the piano played that normally after that. But once I added a pedal it started to show the error messages strait away (The key drive temperature is very high). I just think it was not able to move the pedal to the same position it was calibrated before the adjustment but the message was a bit misleading.As I mentioned before after the process of the pedal calibration everything started to work perfectly.Hope this may help someone.Good luck,DmitryOn 18 November 2016 at 05:30, Bill Brandom billbrando@... [disklavier] <disklavier@yahoogroups.com> wrote:If you have a MIDI file with most notes at maximum velocity, then that is what is causing your overheating problems with the key drive unit.Don't play that file anymore without reducing the velocities and you should no longer get that error message.BillThank you for the diagram - I will definitely check that (a bit away from home this week).Just the issue happened first time recently (twice) but now I cannot reproduce it even I used midi files to play for about 30 min.It might happen that the issue was caused by a file that was not "designed" for disklavier - looks like all the notes had maximum volume. But not sure - I didn't want to run that file again as it was that loud and don't want to stress the piano again.I might contact Yamaha but need to be sure what to tell them if it will be a consistent issue I think as a general maintenance was done recently (within 4 months).On 17 November 2016 at 01:32, tnmshd@... [disklavier] <disklavier@yahoogroups.com> wrote:I guess that your Disklavier system needs fine adjustment.
Most of the reason why the piano performance stops is insufficient adjustment of the pedalpedal regulate and measurement.（The most important point）key regulate and measurement.Regular regulation and tuning.How about asking Yamaha?