Synth-DIY Yahoo! Groups Archives

Thread

MX100II - troubleshooting

2018-08-14 by bobpinsker@...

Hi, all -

First post! Naturally, it's motivated by trouble with my old Disklavier, MX100II. I gather it is from circa 1996 or 1998? It is a true "Disk" instrument, in that it actually plays from floppies (getting a little hard to source!) I had noticed a more and more frequent incidence of problems with the floppy drive, in that it would suddenly skip to the end of a tune or something like that. I had almost stopped using the floppy altogether, and just used a laptop plugged in with a MIDI interface to drive the instrument, though I had to put a floppy into the drive to get the instrument to pay attention to the MIDI interface. (Is that normal?)

So, a while ago, I had the instrument running like this from a laptop and suddenly - I believe there was a sort of "pop" sound - all went dark, like a power supply problem. Since then, it won't power up. When the instrument is plugged in, and I turn on the power switch (below the treble end of the keyboard), I hear a faint click, but nothing on the floppy unit screen, and nothing happens when I turn the floppy unit on or off.

Any hints, along the lines of "well, such-and-such fuse always blows", or "sounds like a bad electrolytic capacitor", or "the floppy drive is the culprit", or . . . ? As long as the answer is not "It's just dead. Buy a new instrument!"

Thanks in advance to anybody who responds!

Best regards from a little bit too warm San Diego -

Bob Pinsker

Re: [disklavier] MX100II - troubleshooting

2018-08-14 by Carol Beigel

Sounds like you blew a fuse.  There are 3 of them on the main board inside the bottom of the piano.  These are replaceable from Radio Shack.  Just get the correct size.

I think I put the service manuals on www.midiplayertools.com to see the schematics, but they are pretty obvious.

Yes, you will always need a working floppy disk in the control box for the piano to work.

Carol Beigel
Sent from my iPhone

Show quoted textHide quoted text

> On Aug 14, 2018, at 3:35 PM, bobpinsker@... [disklavier] <disklavier@yahoogroups.com> wrote:
> 
> 
> 
> Hi, all -
> 
> 
> 
> First post! Naturally, it's motivated by trouble with my old Disklavier, MX100II. I gather it is from circa 1996 or 1998? It is a true "Disk" instrument, in that it actually plays from floppies (getting a little hard to source!) I had noticed a more and more frequent incidence of problems with the floppy drive, in that it would suddenly skip to the end of a tune or something like that. I had almost stopped using the floppy altogether, and just used a laptop plugged in with a MIDI interface to drive the instrument, though I had to put a floppy into the drive to get the instrument to pay attention to the MIDI interface. (Is that normal?)
> 
> 
> 
> So, a while ago, I had the instrument running like this from a laptop and suddenly - I believe there was a sort of "pop" sound - all went dark, like a power supply problem. Since then, it won't power up. When the instrument is plugged in, and I turn on the power switch (below the treble end of the keyboard), I hear a faint click, but nothing on the floppy unit screen, and nothing happens when I turn the floppy unit on or off.
> 
> 
> 
> Any hints, along the lines of "well, such-and-such fuse always blows", or "sounds like a bad electrolytic capacitor", or "the floppy drive is the culprit", or . . . ? As long as the answer is not "It's just dead. Buy a new instrument!"
> 
> 
> 
> Thanks in advance to anybody who responds!
> 
> 
> 
>  Best regards from a little bit too warm San Diego -
> 
> 
> 
>   Bob Pinsker
> 
> 
> 
>

Re: [disklavier] MX100II - troubleshooting

2018-08-14 by George F. Litterst

Good afternoon, everyone.

Bob, what is the “DKC” number on the front of the control unit? In my experience, it is not necessary to have a working floppy drive in order to send and receive MIDI using a Mark II.

BTW, Yamaha Piano Service can be reached at: ‭(800) 854-1569‬

Regards,
PianoBench

Show quoted textHide quoted text

> On Aug 14, 2018, at 5:11 PM, Carol Beigel carol@... [disklavier] <disklavier@yahoogroups.com> wrote:
> 
> Sounds like you blew a fuse.  There are 3 of them on the main board inside the bottom of the piano.  These are replaceable from Radio Shack.  Just get the correct size.
> 
> 
> I think I put the service manuals on www.midiplayertools.com <http://www.midiplayertools.com/> to see the schematics, but they are pretty obvious.
> 
> Yes, you will always need a working floppy disk in the control box for the piano to work.
> 
> Carol Beigel
> Sent from my iPhone
> 
> On Aug 14, 2018, at 3:35 PM, bobpinsker@... <mailto:bobpinsker@...> [disklavier] <disklavier@yahoogroups.com <mailto:disklavier@yahoogroups.com>> wrote:
> 
>> Hi, all -
>> 
>> 
>> 
>> First post! Naturally, it's motivated by trouble with my old Disklavier, MX100II. I gather it is from circa 1996 or 1998? It is a true "Disk" instrument, in that it actually plays from floppies (getting a little hard to source!) I had noticed a more and more frequent incidence of problems with the floppy drive, in that it would suddenly skip to the end of a tune or something like that. I had almost stopped using the floppy altogether, and just used a laptop plugged in with a MIDI interface to drive the instrument, though I had to put a floppy into the drive to get the instrument to pay attention to the MIDI interface. (Is that normal?)
>> 
>> 
>> 
>> So, a while ago, I had the instrument running like this from a laptop and suddenly - I believe there was a sort of "pop" sound - all went dark, like a power supply problem. Since then, it won't power up. When the instrument is plugged in, and I tu rn on the power switch (below the treble end of the keyboard), I hear a faint click, but nothing on the floppy unit screen, and nothing happens when I turn the floppy unit on or off.
>> 
>> 
>> 
>> Any hints, along the lines of "well, such-and-such fuse always blows", or "sounds like a bad electrolytic capacitor", or "the floppy drive is the culprit", or . . . ? As long as the answer is not "It's just dead. Buy a new instrument!"
>> 
>> 
>> 
>> Thanks in advance to anybody who responds!
>> 
>> 
>> 
>>  Best regards from a little bit too warm San Diego -
>> 
>> 
>> 
>>   Bob Pinsker
>> 
> 
> 
>

Re: MX100II - troubleshooting

2018-08-15 by bobpinsker@...

No, unfortunately that's not it - I checked all three fuses in the power supply and all are perfectly fine. The big electrolytic capacitors look ok, too - not swollen-looking or anything.

Next suggestion?

Thanks -

Bob Pinsker

Re: MX100II - troubleshooting

2018-08-15 by bobpinsker@...

There is no number on the front of the controller, strangely enough. Just says "disklavier". And the piece of wood in which it is mounted goes from one edge of the piano to the other - in other words, doesn't look like the controller could be easily swapped out.

The specifics on the nameplate (underside of the main power switch) are:

YAMAHA DISKLAVIER

MODEL MX100II

YAMAHA CORPORATION KM94

SER NO 12816 VR90710

MADE IN JAPAN

Bob Pinsker, San Diego

Re: MX100II - troubleshooting

2018-08-15 by bobpinsker@...

(I should add that when I say the fuses are fine, I mean that I removed each one in turn and checked it with an ohmmeter - zero resistance.)

Re: [disklavier] Re: MX100II - troubleshooting

2018-08-15 by uecker.juneau@juno.com

Just jumping in to this to say a few things. I have the MX100A model and it is true that you do need a functioning floppy drive with disk spinning in order to

Re: [disklavier] Re: MX100II - troubleshooting

2018-08-15 by Michael Jay Jones

If the controller is completely dark, you may have lost the power supply.  With schematics in hand, you can check the power into the supply (yes, you could loose the 110VAC input :) ) and each output.  I had a similar scenario with my M100 II and I had to replace the supply.  I do NOT need a floppy disk in the drive to use the MIDI interface.  I DID loose the floppy drive (in a puff of smoke actually) but installed a new one from Yamaha.  An amazing instrument worth any repair cost IMHO.

Regards,

Mike

Sent from my iPhone

Show quoted textHide quoted text

> On Aug 14, 2018, at 11:59 PM, bobpinsker@... [disklavier] <disklavier@yahoogroups.com> wrote:
> 
> (I should add that when I say the fuses are fine, I mean that I removed each one in turn and checked it with an ohmmeter - zero resistance.)
> 
>

Re: [disklavier] Re: MX100II - troubleshooting

2018-08-15 by George F. Litterst

Good morning, everyone.

Bob, I recommend that you call Yamaha Piano Service: (800) 854-1569. Before doing so, I recommend that you get the piano’s serial number off the cast iron plate. Yamaha can definitively track your model by that number.

It seems odd to me that there is a printed model name and that it is MX100II. Mark II series pianos made for the U.S. market had a rotary dial on the face of the control unit. Does yours have a rotary dial?

I am starting to think that your piano may have been made for a different market.

Regards,
PianoBench

Show quoted textHide quoted text

> On Aug 15, 2018, at 12:50 AM, bobpinsker@... [disklavier] <disklavier@yahoogroups.com> wrote:
> 
> There is no number on the front of the controller, strangely enough. Just says "disklavier". And the piece of wood in which it is mounted goes from one edge of the piano to the other - in other words, doesn't look like the controller could be easily swapped out.
> 
> 
>  The specifics on the nameplate (underside of the main power switch) are:
> 
>    YAMAHA DISKLAVIER
> MODEL MX100II
>   YAMAHA CORPORATION       KM94
> 
> SER NO   12816                              VR90710
>                                                 MADE IN JAPAN
> 
> 
> Bob Pinsker, San Diego
> 
>

Re: MX100II - troubleshooting

2018-08-16 by anchimviet@...

I recently found a beautiful Yamaha piano with the Disklavier MX100A here in Saigon, Vietnam of all places. While everything is functioning well at the moment, I know enough that it it's just a matter of time before the disk drive goes out. I currently use the wireless MIDI interface with an app (PianoStream). I would be interested in learning more about the SSD solution/workaround. Any information you can provide would be greatly appreciated.

Re: [disklavier] Re: MX100II - troubleshooting

2018-08-21 by bobpinsker@...

The printed name I was referring to is on a plate attached to the main power switch underneath the treble end of the keybed. The only printing on the controller (top right) is the word "disklavier" at the left, just left of the controller's power button. Yes, the controller has a rotary dial numbered 10, 9, 8, . . . ,1,0 clockwise, starting at the 7 o'clock position.

Bob Pinsker

San Diego, CA

Re: [disklavier] MX100II - troubleshooting

2018-08-21 by George F. Litterst

Good afternoon, everyone.

Bob, your description sounds like you have a Mark II. Upright Mark IIs, made for the U.S. market, typically say the following on the control unit:

YAMAHA disklavier CONTROL UNIT DKC100R

Regards,
PianoBench

Show quoted textHide quoted text

> On Aug 21, 2018, at 1:12 AM, bobpinsker@... [disklavier] <disklavier@yahoogroups.com> wrote:
> 
> The printed name I was referring to is on a plate attached to the main power switch underneath the treble end of the keybed. The only printing on the controller (top right) is the word "disklavier" at the left, just left of the controller's power button. Yes, the controller has a rotary dial numbered 10, 9, 8, . .  . ,1,0 clockwise, starting at the 7 o'clock position. 
> 
>     Bob Pinsker
>     San Diego, CA
> 
>

Re: MX100II - troubleshooting

2019-08-17 by mymusic54@...

First post as well. Same pop & dark issue with Mark100. Sent power supply to TAP Electonics in California. Tech said my supply unit is now a paperweight. Bad news component involved can't replace, but Yamaha Japan working on solution, maybe have in a couple months. My piano bought in 1995. Have you had any progress on finding a solution to this paralyzing piano problem? I'm taking part to another music-electronic repair person soon, 2nd opinion, to see if there is an alternate solution working with the "dead" power supply unit. Will stay in touch!