Disklavier

Spencer,

Thanks for the encouragement, as well as your contributions to recovering 
many past performance titles.  Our community of piano performance 
enthusiasts is a small one, but with many people that freely share 
experience, and many hours of work in preserving performance art.  The 
task of recovering old paper piano rolls, and converting them to midi, 
allows other artists to build on the piece, and add full orchestration.  
Also, then being able to print the musical score, as it was initially 
performed is a step toward preserving the past.  As these methods get 
better and better, it is amazing to have Gershwin perform on your piano, 
in your own living room, with a nuance that only he could provide.

Brad…

From:  "Spencer Chase lists@... [disklavier]" 
<disklavier@...m>
Reply-To:  <disklavier@yahoogroups.com>
Date:  Tuesday, December 30, 2014 at 1:46 PM
To:  <disklavier@yahoogroups.com>
Subject:  Re: [disklavier] Service Manual and Schematics for MarkII DKC100R

 
 
 
 
   

   Brad,
 
 good luck. i often find myself in similar positions. i am very good with 
electronics, about 40 years experience and have even kept up with modern 
methods. i can fix pretty much anything and can read all but the worst 
schematics. the problem is that companies like Yamaha tend to keep this 
information to themselves. there are plenty of companies  who see the 
benefit to both customers and to their company, to freely share this 
information. my guess is that Yamaha will never be one of these companies 
but i would certainly like to be proven wrong.
 
 

On 12/30/2014 10:33 AM, Brad Harper bharper33@... [disklavier] wrote:
 
 
    
 
 
 
Carol,
 

 
 
A little more background.  This problem has gotten worse over the last 10 
Months.  When the problem first started, the piano would play for about 40 
Minutes, before the problem occurred.  I could actually play an entire 
Pianosoft diskette before it started happening.  Around this time, I also 
upgraded the firmware in the DKC100R controller, because it would not read 
IBM formatted diskettes.  The firmware fixed that problem, after a couple 
tries(bad firmware on the shelf).  I started using the system more because 
I could buy titles that I could download from Yamaha and play.  My system 
has the MU50 sound module as well.  The problem slowly got worse, with 
shorter and shorter play times, before the error occurred. Now the system 
will fault at the first song on a disk.
 

 
 
I took the cover off the foot pedal solenoid mechanism, and disconnected 
the solenoids, but same issue.  Watching the solenoids, it seems like the 
power to them is weak, as the sustain solenoid, only actuated about half 
of it’s travel.  I disconnected the linkages, and it would travel the 
whole distance.  Still no help, about 30 seconds of song play.  
 

 
 
I truly think the power supply is not working up to capacity, and then 
causing the shutdown.  That is why I am looking for a schematic, and 
service manual, so I can test it, and see if it needs to be reworked.
 

 
 
The power supply is not an in-expensive item, and I don’t want to replace 
it, unless I know it is the cause of the problem.  Also I would much 
rather fix than replace.  I have a background in electronics, so I have no 
problem tackling the repair, but I prefer to not do it blindly.  A 
schematic, with test voltages, and testing points, as well as a history of 
common failures would be of great assistance.  Since I retired, I watch 
how I spend a lot more carefully.  I don’t want to just parts swap for the 
purpose of troubleshooting.  I want to make sure that what I buy will 
solve the problem.
 

 
 
Brad 
 
 
 

 
  
From:  "Brad Harper bharper33@... [disklavier]" 
<disklavier@yahoogroups.com>
 Reply-To:  <disklavier@yahoogroups.com>
 Date:  Tuesday, December 30, 2014 at 11:54 AM
 To:  <disklavier@yahoogroups.com>
 Subject:  Re: [disklavier] Service Manual and Schematics for MarkII 
DKC100R
 
 

 
 
 
  
 
 
Thanks Carol,
 

 
 
Could this have been caused by moving the piano to a new location?  I did 
not have this problem until the piano was moved.  It was in storage for 
about 6 months.
 
 

 
 
This link does not contain a Service manual though, is there still one 
more manual?
 

 
 
Thanks again… Brad
  
From:  "Carol Beigel carol@... [disklavier]" 
<disklavier@yahoogroups.com>
 Reply-To:  <disklavier@yahoogroups.com>
 Date:  Tuesday, December 30, 2014 at 10:46 AM
 To:  <disklavier@yahoogroups.com>
 Subject:  Re: [disklavier] Service Manual and Schematics for MarkII 
DKC100R
 
 

 
 
 
  
 

This could be a damper pedal solenoid out of adjustment.  When it  heats 
up it shuts down the entire system.  If it was a power supply it probably 
would not start to play at all.  An experienced Disklavier tech is best 
equipped to make this adjustment.  Otherwise you will find it in the 
service manual or the maintenance manual instructions how to do this.
 

 
 
Carol Beigel
 

 
 
 
On Dec 30, 2014, at 8:15 AM, 'MixMeisterBob' mixmeisterbob@... 
[disklavier] <disklavier@yahoogroups.com> wrote:
 
 

 
 
 
http://yamahaden.com/resources-2/item/281-mark-ii-manual
 
 
 
 
 
From: disklavier@yahoogroups.com [mailto:disklavier@yahoogroups.com] 
 Sent: Tuesday, December 30, 2014 2:36 AM
 To: disklavier@yahoogroups.com
 Subject: [disklavier] Service Manual and Schematics for MarkII DKC100R
 
 
 
 
 
  
 
 
 
 
 
Hi All,
 
 
 
I am looking for a Service Manual and Schematics for MarkII DKC100R
 
 
 
I am Having a “PWM over” error, shortly after starting playback, so I am 
looking for a Service Manual with Schematics for the Solenoid Power 
supply, and any good advice on tests, and what to look for.
 
 
 
That’s a good starter discussion.
 
 
 
Thanks for your Help… Brad
 
Brad Harper
 
Bharper33@yahoo.com
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
    
 
 
-- 

Best regards, Spencer Chase
67550-Bell Springs Rd.
Garberville, CA 95542 Postal service only.
Laytonville, CA 95454 UPS only.
Spencer@...://www.spencerserolls.com
(425) 791-0309