I’ve had a couple of people reach out over the years looking for the bracket that supports the Yamaha DKC-850, otherwise known as the “hanger assembly.” The part number for this is, according to Yamaha, WT79210. Unfortunately, it’s been discontinued. However, you can use the hanger assembly for the Yamaha DKC-800, which is a perfect fit for the DKC-850.
The part number for this hanger assembly is ZE383601, and it’s readily available.
Yamaha’s earlier floppy disks use the propriety ESEQ format. They also use a primitive form of copy protection, where the first sectors of the disks are missing. This means computers identify the disks as corrupt, requiring you to use specialized software to back up your Disklavier disks. In place of these sectors, Yamaha uses the PIANODIR.FIL file, which serves both as a file table and a song index.
Converting MIDI files to ESEQ
If you want to use MIDI files with your older Disklavier, you can, but you have to convert them to ESEQ first. There’s software to do this conversion. You can either get it from http://www.carolrpt.com/MIDItools.htm or you can download the whole DKVUTILS suite from my MEGA drive.
Once you download DKVUTILS.ZIP from my site or theirs, you’ll need to extract it. The program that converts MIDI files to ESEQ files is MID2ESEQ.EXE. This program runs only on Windows, and does not seem to run with emulators. Reach out to me and I can assist with conversion.
If you have a Yamaha that’s capable of playing ESEQ only, you might also need to create a PIANODIR.FIL index. I have instructions here on creating a PIANODIR.FIL index.
Creating a PIANODIR.FIL using DKVUTILS
If you are creating a floppy disk for use with an earlier ESEQ only Disklavier, or if you’re preparing ESEQ files for transfer to a Nalbantov USB stick, you might have to create your own PIANODIR.FIL.
Note: Please note that the filenames should be strictly eight characters long, have no spaces, and be entirely uppercase, including the FIL extension BEFORE following the process below. If you don’t do this, some pianos will be unable to read the files.
You’ll need the DKVUTILS suite downloaded. You can download DKVUTILS from my MEGA drive or from http://www.carolrpt.com/MIDItools.htm.
First, put all the ESEQ files you’ve created in a folder together. The DKVUTILS suite includes a program called ESEQ Explorer. Once you open the program, select the directory you’ve stored your ESEQ files in. You’ll see a screen like the one below:
Note that, if you don’t currently have a PIANODIR.FIL, there will be a red X in front of it. That means it’s not present. Right-click on it and select Create Index. The contents of that folder are now ready to be added to a disk using the Nalbantov tools.
I’ve also quoted the text file from the DKVUTILS.ZIP tool below, since they’re informative:
Yamaha Disklavier discs are always on Double Density (2DD) media, High Density (HD)discs, which are more common nowadays, will not work. Furthermore, they are formatted to 720 Kbytes not the default of 1.2 Mbytes. The original discs are copy protected. This has been achieved by placing invalid data on the first sector. As DOS and Windows always refer to this sector to check out a floppy, they will report that the discs are bad. The Yamaha machinery ignores the first sector so it reads them normally.
The music files on a Disklavier disc have the extension .FIL . They are frequently identified with titles like PIANO001.FIL but sometimes they have names similar to DOS like MUSIC1.FIL. In addition to the music files, there is an index file on the disc. This contains a list of the active music files on the disc, their titles, and pointers to their position on the disc. The index file is always called PIANODIR.FIL and always has a size of 6 Kbytes. In order to set up a Disklavier disc to function on a Disklavier, you must first copy the music files onto it in Disklavier format (ESEQ) and then run the ESEQ EXPLORER program to build the index file.
I’ve recently started recommending customers with worn-out floppy disk drives upgrade them to so-called “Floppy Disk Emulators.” There are a couple of these on the market, but it looks like the easiest to use and most reliable is the Nalbantov USB Floppy Disk Emulator. I use these regularly in Yamaha Disklaviers, but they can also be installed in keyboards. I install these quite regularly. If you do order from Nalbantov directly, make sure to use the AlexPiano for a 5% discount on orders from Nalbantov.
Why Upgrade?
There are several reasons why you might want to replace an old floppy disk drive with a USB floppy disk emulator, including:
I’ve found some floppy disk drives now cost more than the replacement USB emulators, especially if they’ve had minimal use. And hardly anybody knows how to actually repair a floppy drive—that’s a nearly lost art.
Operation
After the Nalbantov is installed, you can use a single USB stick to represent up to 1000 floppy disks. Because it’s a floppy disk emulator, the Disklavier actually believes you’re inserting a different floppy disk. As you switch between virtual “disks” by pressing the arrows, you’ll see the display on the Disklavier behave as though you’ve inserted a new disk. Of course, if you have more than 1000 floppy disks, you can invest in another USB stick, although I haven’t run into this particular situation yet!
The USB stick that comes with the Nalbantov is a standard, full-size USB stick. This protrudes rather far, and I’ve now run into multiple circumstances where the drive has been damaged by an incautious pianist. See my post on the Best USB Stick for Nalbantovs. Hint: It’s the SanDisk Ultra Fit.
Installation
Some customers opt to install the Nalbantov unit themselves. Depending on the design, this is quite doable, although I don’t recommend attempting it with most Yamaha MX100II Disklaviers (see below). It is a very easy installation on, for instance, the DKC5R and the DKC500RW, just to pick a couple.
With some generations of Disklavier (most notably some MX100II uprights), the floppy disk drives are mounted behind a shaped plastic piece. In these cases, you’ll need to cut away the old plastic facing (a pair of flush-cut nippers is helpful here), install the new drive, and put some kind of buffer around it. I’ve experimented with a few different choices for something functional and attractive. Purchasing neoprene strips is a cheap solution.
New solution: There is also a drop-in replacement bezel and floppy drive mount available for purchase, which were made by another Nalbantov client. These are much prettier and easier to use, but come with a price tag.
My solution/old solution: I have a 3D model in STL format of a floppy bezel that’s sized to fit around a Nalbantov. You can 3D print this yourself, or I can mail you one. I adhere it to the replacement Nalbantov with a bit of hot glue, and then slide the whole assembly in. However, you’ll need to improvise a way to actually mount the floppy drive. I use mounting assemblies from old Yamaha slim floppy drives, but these appear to now be discontinued.
For backing up your current Disklavier floppy disks to a format that can be stored on your USB stick, see my article on Backing up Disklavier Floppy Disks. They can then be moved onto a virtual “disk” with Nalbantov’s proprietary tool.
Some of my customers choose to upgrade their older Disklavier’s floppy drive to a Nalbantov USB drive, and want to know how to copy songs from their old Disklavier floppy disks so they can put them on USB. Some of them just want to be able to back up their disks so they can make new ones later. And some are interested in writing altogether new songs to their floppies so they can finally listen to something new!
This post is intended to help you read from, write to, or replace Yamaha Disklavier floppy disks.
If you want your floppy disks files saved on a more modern media, you can also mail your floppy disks to me (please reach out to me at [email protected] or through my Contact page). Nalbantov also has a disk transfer service, and they can be very useful if you encounter particularly challenging disks. Make sure to use the AlexPiano for a 5% discount on orders from Nalbantov.
If you’re adding new music to a floppy disk and have an older Disklaviers (including the popular MX100B), you’ll need to make sure the files are in Yamaha’s proprietary ESEQ format. Using the tools below, you can convert MIDI files to ESEQ so that it will speak your Disklavier’s native language!
Obtaining Files from your Yamaha Disks
Yamaha floppy disks are a great source of songs that you know will be formatted correctly for your piano. However, floppy disks often don’t age well, and are very susceptible to sunlight and magnetic fields. (This is one more reason to back them up!)
Disklavier floppy disks cannot be natively read by your computer, which makes them difficult to back up. They use a very primitive form of copy protection.
There are several tools that will allow you to read them: I use the Player Piano Floppy Backup Utility 1.4, created by Mark Fontana. It’s freeware, but he requests donations. You can download it from him, or you can download ppfbu_v1.4_setup.exe from my MEGA drive. It can read and save directly in ESEQ format, even if the disk it’s reading from is in MIDI. It appears to run acceptably on Mac / Linux using emulators.
There are other tools out there. Most notably, there was a Hack-a-Day project by Tom Nardi that uses a Python script to copy the data off the floppies. His disklav.py tool is available on GitHub.
Obtaining even More ESEQ Files from the Internet
In addition to the originals you might have, you can sometimes find these on eBay or at local music stores. Older disks on eBay are seldom tested, so there’s some risk of receiving junk disks.
There are several large online repositories in both ESEQ and MIDI formats. Some of these are of dubious legality. One legitimate resource is http://www.kuhmann.com/Yamaha.htm, which is also quite a large repository. I have a copy of their entire database on my MEGA drive. (I worry a lot about these older resources disappearing!)
Converting MIDI files to ESEQ
If you want to use MIDI files with your older Disklavier, you can, but you have to convert them to ESEQ first. There’s software to do this conversion. You can either get it from http://www.carolrpt.com/MIDItools.htm or you can download the whole DKVUTILS suite from my MEGA drive.
Once you download DKVUTILS.ZIP from my site or theirs, you’ll need to extract it. The program that converts MIDI files to ESEQ files is MID2ESEQ.EXE. This program runs only on Windows, and does not seem to run with emulators. Reach out to me and I can assist with conversion.
If you have a Yamaha that’s capable of playing ESEQ only, you might also need to create a PIANODIR.FIL index. I have instructions here on creating a PIANODIR.FIL index.
Note: If you are using a Nalbantov, any USB stick you use MUST be formatted either FAT16 or FAT32. Please also note that the filenames should be strictly eight characters long, have no spaces, and be entirely uppercase, including the FIL extension BEFORE creating the PIANODIR.FIL file. If you don’t do this, some pianos will be unable to read the files.
You can also source files from Yamaha’s website, although this is the most expensive option. Many of their MIDI files have multiple instruments (or even limited piano), and are more designed for their keyboards and other MIDI devices. However, they do have an entire category of Piano Solos, and these are what you’ll want to search for when selecting files. When you download these, you get their associated MIDI files, which are comfortably sized for floppy disk purposes.
MIDI files that have only one track are called Type 0 files. MIDI files with multiple parts are Type 1. Occasionally, the piano will be spread between two tracks. In that case, you’ll find the resulting ESEQ has only half the notes it should. You can convert Type 1 to Type 0 files using the tool gn1to0.exe that’s also stored on my MEGA drive. This is a slightly cumbersome tool, but will either run on Windows or on Linux/Mac using Wine.
Potential ESEQ Problems
Earlier Disklaviers can be finicky about their ESEQ files. Sometimes, they’ll work without any trouble, even without a PIANODIR.FIL file. However, particularly in earlier Disklaviers (such as the DK5R), you’ll need to be more careful with the naming conventions, and you’ll definitely need that PIANODIR.FIL.
Just to reiterate, if you’re using a USB stick, it must be formatted FAT16 or FAT32. If you’re using an actual floppy disk, it must be a 2DD disk formatted to 720 KB. If you’re unfamiliar, Nalbantov supplies a video on how to format your USB stick.
I’m very grateful for the research of Mike Isreal (in the comments below), who did experimentation with his own Disklavier. Before creating a PIANODIR.FIL for your disk, make certain that all filenames are precisely eight characters long, and that both the filename and extension are in all-caps. The filename must contain no spaces.
It appears you can also ommit the .FIL extension (at least in some cases). According to Nalbantov, there might be cases where a fully lower-case filename and extension are called for, although I have not run into that particular case yet.
Some of this is caused by the choosiness of the Disklavier itself, but it seems likely to me that a lot of the free tools we’re relying on probably add their own complications. If you are experiencing any trouble, please reach out to me for assistance. You can also Categories Disklaviers 10 Comments
Yes! This is a common problem with older Disklaviers, and usually indicates that the power supply has failed. I can box it up and send it to Tap Electronics, who can then rebuild it. At present (1/17/23), this is a flat-rate service provided by Tap for $700. Tap Electronics is authorized by Yamaha.
Yes! You might have a power supply that’s dying (in which case, see the answer to the last question). However, you might simply have a damaged power button. You can test this by wiggling the power button side-to-side with your finger. When they wear out, sometimes even just the vibrations of the piano can cause them to switch on and off. These buttons aren’t terribly difficult to replace; however, they’re discontinued.
Their (discontinued) Yamaha Part number is VN388300. The switch itself is a (discontinued) ALPS SPPH23. You can see a spec sheet for the ALPS SPPH230500 here. Unfortunately, I haven’t found an exact duplicate, and would love to know if you have. I purchase bulk generic locking switches from Amazon and use sandpaper to shape them to size.
Yes! I wrote a definitive guide on connecting the Disklavier wirelessly. I don’t generally recommend using the native wireless adapters that come with your device, which are clumsy and confusing. I use PowerLine adapters, which allow you to broadcast your network signal right through the power lines in your house! This technology means neither you nor your piano ever have to adjust and reconfigure anything. No keeping track of passwords, no weak signals, and no need to call a technician every time you buy a new router. Just plug in your piano and marvel at its spontaneous, excellent internet connection.
This works in most homes, although in particularly large houses or houses with old wiring the PowerLine adapters might have trouble. In that case, the best device to use is a WiFi extender mounted underneath the piano.
Replacement is sometimes an option, and upgrading always is. Most manufacturers have stopped producing replacement drives, but they can often still be purchased second hand. eBay is a good resource.
However, I recommend upgrading to a USB floppy disk emulator. The Bulgarian company Nalbantov Electronics manufactures USB floppy disk emulators specifically for older digital pianos and players. These systems allow you to use a single USB stick in place of dozens (if not hundreds) of floppy disks. As solid-state devices these are considerably more durable and long-lasting than old-fashioned floppy drives.
With some generations of Disklavier (most notably some MX100II uprights), the floppy disk drives are mounted behind a shaped plastic piece. In these cases, you’ll need to cut away the old plastic facing (a pair of flush-cut nippers is helpful here), install the new drive, and put some kind of buffer around it. I’ve experimented with a few different choices for something functional and attractive. Purchasing neoprene strips is a cheap solution.
I have a 3D model in STL format of a floppy bezel that’s sized to fit around a Nalbantov. You can 3D print this yourself, or I can mail you one. I adhere it to the replacement Nalbantov with a little bit of hot glue, and then slide the whole assembly in.
You can read more about this on my Nalbantov Floppy Disk Drive Upgrades page.
The Yamaha E3 (or DKC-850) firmware update is wonderfully simple, unlike its older Mark IV sibling. The entire update can be done using just a USB stick with at least 20MB of memory.
The Problem
In October of 2020, Yamaha mandated that its pianos use better encryption standards (all pianos now use TLS 1.2 instead of TLS 1.1). If you connected your piano to the internet before October of 2020, it probably automatically updated to the latest firmware. However, if you weren’t so lucky, you’ll have to perform the updates yourself.
The Solution
First, you’ll need to download a copy of the new firmware, and you’ll need a USB stick.
You can obtain this either by downloading the Yamaha E3 v3.54 file (dkv_update.bin) from my MEGA drive, or you can visit Yamaha’s website for an archived copy. Once you have the dkv_update.bin file, simply copy it on a USB stick (not in any directories or folders). Take that USB stick and insert it into your Disklavier. Now hold down the Play / Pause button and power on the system (with the Play / Pause button still held). From there, you can follow the on-screen instructions.
If you have any difficulties, I’ve attached a PDF of their instructions below. You’ll need to start with “Downloading the Update Program using a PC and USB Flash Memory” on page three.
In order to connect your Yamaha Mark IV to the internet, you’ll need to update the firmware; otherwise, you’ll receive an error telling you it can’t connect to the internet. This is a pretty confusing error, since you might actually be properly connected. However, the Disklavier can’t tell the difference between no internet and just unable to talk to Yamaha. As far as it’s concerned, if it can’t see Yamaha, the internet may as well not exist!
The Problem
In October of 2020, Yamaha mandated that its pianos use better encryption standards (all pianos now use TLS 1.2 instead of TLS 1.1). If you connected your piano to the internet before October of 2020, it probably automatically updated to the latest firmware. However, if you weren’t so lucky, you’ll have to perform the updates yourself.
The Solution
Here’s what you’ll need to complete the update:
The floppy diskette is used only by the Disklavier: You do not need to be able to write to the floppy disk from your personal computer.
You can buy blank floppy diskettes from https://www.floppydisk.com/. Amazon and eBay are also good suppliers of floppy diskettes. Personally, I like to use old Sony 2HD diskettes purchased from eBay. Although these aren’t the newest floppy diskettes available, they’re some of the most reliable I’ve been able to find.
CD-Rs are readily available on Amazon, as are CD writers.
You can also purchase both the CD-R (pre-written) and blank floppy disk from me. I sell both for $30.00 at this time. You can purchase one from me here, or contact me at [email protected].
Once you’ve got your media, you’ll need to burn the updated firmware to the CD.
You can download the Yamaha Mark IV firmware 4.26 from my MEGA drive. (The correct firmware is under the Firmware / Mark IV v4.26 directory.)
Yamaha also keeps copies on their FTP server. This is available at ftp://54.183.42.154/ using the username disklavier and the password disklavier. Update, May 31st, 2024: I can no longer log into their FTP server. At present, it appears my MEGA drive has the only copy available!
Once you’ve burned this to your CD-R, you’ll need to prepare your boot floppy. Now, if you happen to have a floppy disk drive and feel like saving a little time, you can copy the floppy disk files from my MEGA drive and put them on your floppy disk. You can then skip the below step. The below is copied from Yamaha’s firmware update instruction manual (emphasis and notations mine):
Unit must be completely booted — green standby light solid green Floppy must have the Protect tab to the Unlock position-hole is covered 1. Insert one Blank High Density Disk--HD--into the floppy drive. 2. On the PRC-100, from the "Interface Main" tap on "Next -->" located on the bottom right corner, it will take you to the next page. 3. Tap on the "Setup" icon. Tap on the "Next -->" Bottom right corner. 4. Tap on "System". Tap on "Make Install FD". It will take approximately two minutes to make the boot Disk. 5. Tap on "OK" when the "Complete" message is displayed. 6. Press on the Back button repeatedly-the button that has the U turn arrow-until you see the "Interface Main"
Once you have the media prepared, follow their instructions for performing the update (emphasis and notations mine):
1. Hold down standby button on the Media Center until the button starts flashing. The Disklavier shuts down. 2. Wait approximately 10 seconds or more, and then press standby button on the Media Center. Update of the I/O Center starts. 3. During update, the buttons on the Media Center light in sequence. Note: The update cannot be performed if the remaining capacity of the hard disk drive is too small. The CD will eject and flash. In such case, close the CD tray, reboot the I/O Center, and then increase the storage capacity, by for example deleting song data in the PianoSoft Library or CD Library by as much as the amount of data stored on one CD. After that, try reupdating. 4. The update will continue for approximately 25 minutes before the CD tray opens. Note: The CD may eject and flash. In such a case, check that there are no scratches, stains, or dirt on the CD that can lead to readout error. If the CD is defective, clean the CD and reload it. The I/O Center reboots. If the CD is defective and a replacement is required, remove the CD and press to close the CD tray. The I/O Center reboots (though updating has stopped). 5. Wait until the CD tray opens, and then remove the CD and the floppy disk. (Alex's Addition: You may have to wait another 30 minutes from this point for the update to finish installing. The LED indicators sequentially flash, then illuminate solid, left to right.)
And that’s it! Your firmware is updated. You can now proceed to Connecting your Disklavier to a network! If it’s already connected, you can read more about using piano radio in their Advanced Owner’s Manual (Part 2) on Chapter 8, Page 96.
You can link directly to this page with https://setupdisklavier.com.
Yamaha Disklaviers are an innovative fusion of digital and acoustic engineering. They allow you to experience famous, concert pianists performing right in your living room, on your piano. They’re an excellent tool for both entertainment and for learning. And of course, they’re just fun to watch. Take a look at this beautiful 2009 Yamaha GC1 Disklavier playing Billy Joel’s Piano Man that I recorded last summer.
They do have one drawback: Connecting them to Wi-Fi networks can be confusing and difficult. Yamaha provides the UD-WL01 adapter, but this is not an intuitive device: Is your Disklavier acting as an access point for other devices, or is it connecting to your Wi-Fi as a client? Is it doing both? Can you tell from the instructions what you’re expected to do, and how you’re supposed to use the Disklavier and connect to the internet at the same time?
I’m sharing an incredibly elegant, simple way to hook up Yamaha Disklaviers. You don’t have to worry about reconnecting it if you change your Wi-Fi password or buy a new router. You can set it up quickly, and it works in most houses.
First, your supplies:
1. NexusLink Powerline Ethernet Adapters
These devices allow you to network through the electrical lines in a house. Your piano will believe it has a physical connection, and you won’t need to do any further configuration!
These devices are effortless to use once they’re paired: All you have to do to keep your piano connected is plug them in!
Make certain that the adapters are plugged directly into outlets, or into the surge protector below. Power conditioners, universal power supplies, or even higher-end surge protectors interfere with their signal. Similarly, they must be plugged into circuits that are in the same breaker box. Multiple breaker boxes or sub-panels can interfere with the signal.
It’s worthwhile to label the adapters. This will help with troubleshooting in the future. If you have specific networking needs, you can download the full manual for the NexusLink Powerline adapters here. (Or from my MEGA mirror.)
2. GE Designer 3-Outlet Surge Protector (pair)
This is an 8-foot extension cord with a three port power strip on the end. It calls itself a surge protector, but doesn’t do any regulation or conditioning which might interfere with the NexusLink signal.
I did a tear-down of the device to make sure there were no surprises: Surge protection is achieved through a metal oxide varistor, and there is no voltage regulation beyond that.
3. Black CAT6 Ethernet Cables (1 foot and 3 feet)
With piano work, subtlety is a must. Anywhere black or concealed equipment can be used, I use it. One foot has always been enough for me. More cord just means more to hide.
4. 3m Dual Lock Reclosable Fastener
These are strong, interlocking fasteners that aren’t vulnerable to vibration, and are strong enough to hold up the end of the extension cord.
And now, we get started…
Remove the two NexusLink Adapters from their box and plug them both into the outlets where you intend for them to go. One will be next to the router and, and the other will be plugged into the extension cord you intend to put underneath the piano. No Ethernet connections are necessary at this time.
If the green connection lights on your NexusLinks turn on (the top light on each adapter), that means they’ve found one another, and are now communicating through your household power. Great!
Now you can secure their connection to each other. On the bottom of each unit (near the Ethernet jack) there’s a small configuration button. Hold it down for three seconds, and the bottom of the three lights—labeled with a padlock—will begin to blink. Now press the same button on the other NexusLink for three seconds. After a short period of time, the padlock lights will turn solid. Then, some seconds later, the connection lights should turn solid as well.
These two NexusLinks are now a permanently bonded pair. No matter where you put them, they’ll find one another. In fact, they’re so tightly paired that they’ll even ignore other NexusLinks.
If you have specific networking needs, you can download a full manual for the NexusLink Powerline adapters here (or from my MEGA mirror).
With the Disklavier turned off, unplug the Disklavier.
Pick a good spot to mount the power strip underneath the piano. This is usually parallel to the floor on the side of one of the wooden beams adjacent to the Disklavier controller. (Also, make certain if there is a Dampp-Chaser installed, make sure the NexusLink isn’t near the humidistat, where the small amount of heat it produces might cause less accurate readings.)
Wipe the area down with alcohol. Take two pieces of your Scotch Interlocking Fastener and, after removing the backing, affix both to the back of the power strip. Mount the power strip to the beam.
If possible, try to route the power cord over a beam. This will keep it a more secure in the event it gets pulled on. You can even loop it around the beam once if you have enough cord.
Plug your other NexusLink Powerline Ethernet Adapter into the bottom port of the three of your power strip. Run a short length of Ethernet cord to your Disklavier controller. If possible, loop the Ethernet cord up over the beam to apply a bit of tension. Pianos produce plenty of shaking and vibration, so keep things as secure as possible. Use no more cable than you need.
Now plug the Disklavier power into the power strip (and the Dampp-Chaser as well if one is installed). This extension cord is comfortably rated for the power consumption of all three devices.
At this time, both the green connection lights should be on, and both the padlock lights, meaning the NexusLink Adapters have discovered one another. If this isn’t the case, skip to the troubleshooting below.
Use zip-ties, twist ties, and other appropriate cable management to bundle everything up and out of sight. Stick-on conduit can be used to run cords along the beams if precise positioning is needed, such as if the piano is positioned next to a low couch or somewhere else people might easily see underneath. I’ll actually sit in various chairs in the room and look at the piano.
You’re all done! If it doesn’t work immediately, read on.
First: It’s probably a power strip or Universal Power Supply (UPS)
Do not plug either Powerline adapter into a power strip or surge protector if you can avoid it. These often filter out the signal. Only simple power strips (like the GE one I recommend) will not block the signal. When in doubt, plug directly into the wall. And don’t forget to check the adapter that’s near your router. This also needs to be plugged directly into the wall.
Second: It might be the outlet
If the outlet isn’t receiving power, it won’t work. Make sure that the outlet can power other devices, and that it isn’t controlled by a switch.
Third: It might be the breaker boxes
If the house has multiple breaker boxes, then the devices might not be able to see each other. In this case, try different outlets. You can try changing outlets both near the piano and near the router.
If none of the available outlets work, you’ll need to try a different approach. This article is specifically on the Powerline adapter technique, but you’ll need to consider using a Wi-Fi bridge, since the Powerline adapters won’t work for you.
Has it been working for a while, but suddenly stopped?
As with many other pieces of sensitive electronics, if it’s been behaving and suddenly stops, you should power cycle the devices. Unplug each Powerline adapter in turn and plug it back in. If that doesn’t work, pair the adapters again in the manner described in step one.