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Yamaha silent piano mechanism not engaging
#3050970 11/29/20 05:29 PM
Joined: Mar 2010
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We have a 10 year old Disklavier (DC7M4PRO) that has the silent piano feature. From time to time, the silent feature would not engage. Thinking that this was a "s/w" issue, we'd power down, unplug the power cord, and then power back up again. This procedure would work and all would be well.

Now, however, this powering down doesn't help. Although the blue LED for the silent feature turns on (whether the button is pressed or headphones are plugged in), the typical "mechanical noise" of the feature restricting the hammers doesn't appear. Come to think of it, neither does sound come out of the headphones.

I'm hoping that a solenoid or switch or motor is at fault. Or even a connector with an intermittent "connection".

Any suggestions? And as I read in another post somewhere, even if this requires that a trained technician needs to be called in for the repair (which, BTW, I have no problem paying for), it would be nice to know what the issue might be ahead of time.

Cheers,
John

Re: Yamaha silent piano mechanism not engaging
samoyammie #3051094 11/30/20 02:05 AM
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Problem solved smile

My fear of having to pay for a potentially expensive repair motivated me to learn all I could to isolate the possible cause of the malfunction. Bottom line was there was a cable end that wasn’t fully seated. It runs from the CSP (central signal processor -the brains) to the PS (power supply unit). I’m a very happy camper as they say. No need to read further unless you’re interested in some of the specifics of the journey.

I found a PDF copy of “Disklavier IV/Pro Series Maintenance Handbook” online and it included some post delivery checks as well as some field servicing info. I learned that one could access the Service Center app on the PRC100 pocket controller that interfaces with the Disklavier. And there is a Maintenance Mode one can enter with a key sequence.

Long story short, not being able to “read” info that’s resident in the CSP, nor initiate any “piano response” that gets the solenoids to “play” keys nor move the pedals, I feared that the CSP was faulty. Again, worrying about how much a professional diagnosis and CSP repair (or replacement) could set us back, I crawled under the piano again and inspected the ends of every cable that plugged into it. That’s when I found the loose connection at the PS end. Yes! Now everything works!

Cheers,
John


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