Hi Geoff,
I am sorry to hear about the problems you explained in your email. If your pedals are failing as often as you say, then you have a hardware problem. Having your pedals quit 3 times an hour is NOT the norm with the Disklavier Mark IV and is a problem that needs to be corrected. The problem I described in an earlier post is something that occurs after leaving the Disklavier on for long periods of time (typically longer than 2 weeks.) This problem is corrected by doing a complete power down, disconnecting it from power and letting it "rest" for 30 minutes or more. Through the years of Mark IV production, this problem was pretty much solved, but not totally eliminated. I have found that if I go through this power down procedure about once a week, then I never have a pedal playback problem.
Lets troubleshoot this a little bit. How old is your piano? If you are not sure, give me the serial number of the piano (a seven digit number on the plate or harp) located under the treble end of the music desk. How long has this problem been happening? Have you reported this problem to Yamaha? If so, what was recommended and what was the result? When was the last time you had the piano calibrated? Has your piano been updated to the latest operating system?
If I was there, I would try the following. Normally this is done by a Disklavier technician, but if you are careful, you can do it yourself. Power down the piano again and disconnect it from power. On the back side of the key drive unit under the treble end of the piano, you will find a box that contains the CSP (Central Signal Processor) board. There are a number of RCA connections to this box. Disconnect and re-insert the the two connectors labeled TO I/O BLUE and GREEN. Disconnect and re-insert the connector labeled TO PD. Go to the I/O unit and disconnect and re-insert the BLUE and GREEN connectors located on one end of the I/O Center above the LAN connector.
Plug the piano back into the A/C and power back up. Record a two minute song of playing the damper pedal and shift pedal (right and left pedals), depressing each pedal every two seconds. Then, play this song back 4 or 5 times. If the pedals continue to work, then play your music as you normally do and see if the pedals continue playing or not.
Let me know the results. Hopefully, your pedal issue is solved.
Bill
On Fri, Dec 27, 2013 at 7:27 PM, <gward1211@...> wrote:
Hi Bill
I also have a Mk IV (C3 DKV). I experience the pedal problem often, 3 times in the space of an hour when playing files on the HDD through DKVBrowser. I can fix it simply by going to standby mode and on again. I rarely have the problem when playing midi files from my laptop using VanBasco's Karaoke Player.
I power down and turn the power off at the wall socket every night.
This seems to be an identifiable and common bug affecting a lot of users - probably every Mk IV user. Do you know why Yamaha doesn't put out a fix for it?
Many thanks for your knowledge, wisdom and help in these pages.
Geoff
Long live Disklavier