Welcome to the Piano World Piano Forums
Over 2 million posts about pianos, digital pianos, and all types of keyboard instruments
Join the World's Largest Community of Piano Lovers (it's free)
It's Fun to Play the Piano ... Please Pass It On!

SEARCH
the Forums & Piano World

This custom search works much better than the built in one and allows searching older posts.
(ad 125) Sweetwater - Digital Keyboards & Other Gear
Digital Pianos at Sweetwater
(ad) Pearl River
Pearl River Pianos
(ad) Pianoteq
Latest Pianoteq add-on instrument: U4 upright piano
(ad) P B Guide
Acoustic & Digital Piano Guide
PianoSupplies.com (150)
Piano Accessories Music Related Gifts Piano Tuning Equipment Piano Moving Equipment
We now offer Gift Certificates in our online store!
(ad) Estonia Piano
Estonia Piano
Quick Links to Useful Stuff
Our Classified Ads
Find Piano Professionals-

*Piano Dealers - Piano Stores
*Piano Tuners
*Piano Teachers
*Piano Movers
*Piano Restorations
*Piano Manufacturers
*Organs

Quick Links:
*Advertise On Piano World
*Free Piano Newsletter
*Online Piano Recitals
*Piano Recitals Index
*Piano Accessories
* Buying a Piano
*Buying A Acoustic Piano
*Buying a Digital Piano
*Pianos for Sale
*Sell Your Piano
*How Old is My Piano?
*Piano Books
*Piano Art, Pictures, & Posters
*Directory/Site Map
*Contest
*Links
*Virtual Piano
*Music Word Search
*Piano Screen Saver
*Piano Videos
*Virtual Piano Chords
Topic Options
#1546537 - 10/29/10 09:00 PM Problems with Yamaha MX100B with Disklavier
Rich H Offline
Junior Member

Registered: 10/24/10
Posts: 2
Loc: Delaware
We purchased a used Yamaha MX-100B (with Disklavier) last year and had it professionally moved and tuned once it arrived. It has worked fine since then, up until about 1 week ago. Part way through a playing a disk, the piano went silent and displayed "Piano Power Off - (PWM Over)!" If you power down and restart, it will again play partway through a song and display the same error. I'm curious if there is a simple fix for this or is it something to call out a pro for? I'm an electrical engineer with a heck of a background in "fixing" things, but without a maintenance manual or finding anything in the operations manual, I don't know where to begin. Any thoughts?
_________________________
Richard A Holub

Top
(ad PTG 568) Grand Action Regulation in 37 Steps
Grand Action Regulation in 37 Steps
#1547032 - 10/30/10 03:40 PM Re: Problems with Yamaha MX100B with Disklavier [Re: Rich H]
Dave Lotek Offline
Full Member

Registered: 12/31/06
Posts: 78
Loc: midwest
ftp://tech:disklavier@216.154.248.26/ Try this link, (copy & paste) look under service manuals. Hope this helps.


Edited by Dave Lotek (10/30/10 03:41 PM)
_________________________
Piano Sales, Piano Technician, "Tuning pianos for a song"

Top
#1548829 - 11/01/10 09:43 PM Re: Problems with Yamaha MX100B with Disklavier [Re: Dave Lotek]
Rich H Offline
Junior Member

Registered: 10/24/10
Posts: 2
Loc: Delaware
Many thanks. Found the error message and as I suspected, looks like it is going to be a power supply related issue. I always like to know the problem before I call in someone else - don't like not knowing what I'm asking someone else to do. Thanks again - I appreciate the link and the manuals.
_________________________
Richard A Holub

Top
#1628696 - 02/26/11 04:59 PM Re: Problems with Yamaha MX100B with Disklavier [Re: Rich H]
Marge Offline
Junior Member

Registered: 02/24/11
Posts: 1
Richard I have the same problem with my Disklavier MX100 II it will give me the same message Piano Power Off - (PWM Over)!" and will do the same if you restart it play one or 2 songs and stop did you ever fix the problem with yours thanks in advance Marge


Edited by Marge (02/26/11 05:04 PM)

Top
#1628910 - 02/27/11 12:18 AM Re: Problems with Yamaha MX100B with Disklavier [Re: Rich H]
pppat Offline
1000 Post Club Member

Registered: 08/09/08
Posts: 1195
Loc: Jakobstad, Finland
@Rich H: I have a limited experience with these instruments, but at least the one we host is exposed to similar problems - albeit randomly, but still. If you cure the problem by switching/repairing the power supply, please let me know.
_________________________
Patrick Wingren, RPT

Senior Lecturer (jazz piano, composition, music theory, conducting) @ Novia University of Applied Sciences, Jakobstad, Finland
- - - -
Dedicated to learning the craft of tuning. Getting better.

Top
#1993276 - 12/01/12 04:55 PM Re: Problems with Yamaha MX100B with Disklavier [Re: Rich H]
chrigi Offline
Junior Member

Registered: 12/01/12
Posts: 1
Hello I had the same problem and have solve it:

The power supply have a 20V-regulater (IC2 MJN78M20FA) witch is operated outside of its specification. At the entrance he receives 50V instead of the 40V allowed! Therefore, it switches off automatically.I put a strong Zener diode in series, so that it works with <40V.
Problem solved! smile

Top
#1993329 - 12/01/12 06:17 PM Re: Problems with Yamaha MX100B with Disklavier [Re: Rich H]
David, Las Vegas Offline
Full Member

Registered: 10/07/08
Posts: 211
Loc: Las Vegas, Nevada
Check to see if the pedal solenoids are overheating. There should be pedal adjustment instructions on the inside cabinet. Sometimes the power error will be related and if the solenoid is too hot then it will terminate power to the system long enough for it to cool down to operating temps then you can prompt playback until it overheats again. Two cents.
_________________________
David Chadwick RPT
Las Vegas, Nevada
1923 Steinway "M"
1931 Mason Hamlin AA

Top
#2161082 - 10/03/13 06:56 AM Re: Problems with Yamaha MX100B with Disklavier [Re: Rich H]
jaguar8888 Offline
Full Member

Registered: 05/13/07
Posts: 27
Loc: Sydney Australia
Hi everyone.
I know it's been a couple of years since this post, but I now have a similar problem.
I have an MX101R, which seems to be the Japanese domestic version of the MX100B.
Was working perfectly and then all of a sudden, it wasn't. Wouldn't even play from a floppy!
Sometimes it will start to play a MIDI file through Cakewalk, but then it gives up after only a few bars!
All the diagnostic tests 1-9 are OK except #7 the MIDI one, which has NG, even though the MIDI cable is connected. And the notes test #8 only plays up to note #30. (LCD says Get data = 55)
Re the MIDI test #7, you can't activate the MIDI switch with the red light wheh you start the test programme, because the + and - keys held together prevents you from doing that. And when the test in running, pressing the MIDI switch does nothing.
Any clues anyone? Is this related to the 40/50v problem above? How would I know if this is the case?
I don't get the "PWM over" error message though.
Ian Griggs
Sydney Australia

Top
#2161083 - 10/03/13 07:03 AM Re: Problems with Yamaha MX100B with Disklavier [Re: jaguar8888]
jaguar8888 Offline
Full Member

Registered: 05/13/07
Posts: 27
Loc: Sydney Australia
The frustrating thing with the Service Manual is that it doesn't tell you how to address any of the NG faults!

Top

Moderator:  Piano World 
What's Hot!!
HOW TO POST PICTURES on the Piano Forums
-------------------
Sharing is Caring!
About the Buttons
-------------------
Forums Rules & Help
-------------------
ADVERTISE
on Piano World

The world's most popular piano web site.
-------------------
PIANO BOOKS
Interesting books about the piano, pianists, piano history, biographies, memoirs and more!
(ad) HAILUN Pianos
Hailun Pianos - Click for More
ad (Casio)
Celviano by Casio Rebate
Ad (Seiler/Knabe)
Seiler Pianos
Sheet Music
(PW is an affiliate)
Sheet Music Plus Featured Sale
(125ad) Dampp Chaser
Dampp Chaser Piano Life Saver
(ad) Lindeblad Piano
Lindeblad Piano Restoration
New Topics - Multiple Forums
Pianoteq vs Digital Piano vs Acoustic Piano
by wildpig
09/16/14 11:57 PM
Baldwin Hamilton 1941
by JMN12
09/16/14 11:13 PM
Tucson, AZ: Is Arizona Room a bad place for a piano?
by Paul678
09/16/14 08:14 PM
Kissin plays...
by JoelW
09/16/14 07:33 PM
For Sale : True Keys Pianos (bundle) American,Italian,Ger
man

by imyself
09/16/14 05:51 PM
Who's Online
66 registered (255, barbaram, AEMontoya, beeboss, 13 invisible), 961 Guests and 15 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
76224 Members
42 Forums
157573 Topics
2314559 Posts

Max Online: 15252 @ 03/21/10 11:39 PM
(ads by Google)

Visit our online store for gifts for music lovers

 
Help keep the forums up and running with a donation, any amount is appreciated!
Or by becoming a Subscribing member! Thank-you.
Donate   Subscribe
 
Our Piano Related Classified Ads
|
Dealers | Tuners | Lessons | Movers | Restorations | Pianos For Sale | Sell Your Piano |

Advertise on Piano World
| Subscribe | Piano World | PianoSupplies.com | Advertise on Piano World | Donate | Link to Us | Classifieds |
| |Contact | Privacy | Legal | About Us | Site Map | Free Newsletter | Press Room |


copyright 1997 - 2014 Piano World ® all rights reserved
No part of this site may be reproduced without prior written permission