DKC-800 Intermittently Reboots

[Joel Grospe]

Original owner of a 2011 Yamaha DC2E3 here. Any ideas on what’s going on and what I can do to resolve this ongoing issue of the DKC-800 intermittently rebooting itself?  Sometimes it would play for an hour uninterrupted while at other times it would reboot again within a minute of rebooting.  It will do it regardless of whether I’m playing from the system’s memory, or USB or CD.  

Thanks in advance for all your suggestions. 

Joel Grospe

San Clemente, California 

[Mark Fontana]

You might try disconnecting all of the cables except power and see whether the rebooting still occurs.  If it does, it means the cause is internal to the unit (not due to external factors) and might involve faulty flash memory or DRAM, bad calibration data, etc.  I’d also try running a full calibration and see whether that makes a difference. If it’s possible to reflash the firmware, that could be worth trying too.

On Sep 6, 2023, at 6:26 PM, Joel Grospe <mail...@gmail.com> wrote:



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[Joel Grospe]

Thank you Mark.  I will try to do the steps that you suggested. 

Btw, would upgrading to Enspire controller a simple plug-and-play option for the E3 (and quite possibly also eliminate the rebooting issue)?

Thank you!

Joel

On Sep 6, 2023, at 8:16 PM, Mark Fontana <ma...@kinura.net> wrote:



To view this discussion on the web visit https://groups.google.com/d/msgid/disklavier-support-group/B27247B7-BFA7-4491-9A73-00BD0E001B7D%40kinura.net.

[J Grospe]

Alright, tried to do all that and the unit still intermittently reboots in the middle of playing pianosoft music.  Researched the internet and it seems to point to the power supply.  Apparently, there's this shop in Buena Park, California near Yamaha's Headquarters that does this and so I called them, the business name is TAP Electronics. The guy I spoke with, Sal, sounded very familiar with the problem and confirmed that indeed those symptoms indicate the power supply is causing all the trouble. The "ICM" needs to be replaced.  Flat fee of $850.  I searched the internet and TAP Electronics appears to be the go to place when it comes to fixing Disklavier power supply.  In 2017, these guys used to charge a $200 flat fee.  Last Sept. 2024, they charged $750.  My question is do we have an alternate shop who might probably charge less?  It's $850 now.  Hurry with your thoughts please, it could be $900 next week lol :)  Without an alternative, I'll need to take this power supply to TAP as I just want it fixed.  I'm thinking of upgrading soon to a DKC-900 unit and want to make sure everything is in order before the upgrade.

To view this discussion on the web visit https://groups.google.com/d/msgid/disklavier-support-group/B27247B7-BFA7-4491-9A73-00BD0E001B7D%40kinura.net.

[Mark Fontana]

I might be wrong, but my recollection from reading various Disklavier forums for years is that TAP arranged to have exclusive access to a Yamaha-specific integrated circuit used in the power supplies, giving them the ability to charge whatever the market will bear.

Until someone comes up with an alternative for that part or designs a compatible aftermarket power supply, TAP seems to be the only option.

To view this discussion visit https://groups.google.com/d/msgid/disklavier-support-group/CALqeXJReFJCGKdN2g5Ax41ijPRreDfQof-hqB4t3hqcSL4PVQw%40mail.gmail.com.

[SJ Hart]

I had a similar problem (on my DKC-850), but it turned out that the on/off switch and circuit was bad (according to my piano tuner/tech).  I ended up ordering this part from Yamaha and installed it myself.  Not sure if you have the same issue and I only ordered the part because my tech was pretty confident it was the issue.   The part I ordered for my issue was:

The price of the part was expensive, so likely have gone up in the last few years.  Good luck! 

To view this discussion visit https://groups.google.com/d/msgid/disklavier-support-group/8447e624-b4f0-4e9f-b49f-4135d0a6a906%40kinura.net.

[J Grospe]

Thank you Mark Fontana and SJ Hart for your helpful thoughts!

Joel Grospe

To view this discussion visit https://groups.google.com/d/msgid/disklavier-support-group/8447e624-b4f0-4e9f-b49f-4135d0a6a906%40kinura.net.

[J Grospe]

I found online another DKC-800 user that has the same issue as mine-  intermittent reboots - and the solution was to replace the USB board.  It makes me think now that it is indeed the actual culprit.  TAP Electronics was insisting (suspiciously to me) that they'd clean my DKC-800 unit for $50 while they worked on the power supply (for $850).  

1.  To SJ Hart who had done this before:  How hard was it to remove and replace the USB Board Part No. WN757300? Did you order the part from Yamaha?

2.  To everyone: Would you recommend for me to just buy the DKC-900 since I'm looking to upgrade anyway?  At least, if the intermittent reboot issue is fixed, then I'd be able to save parts money and repair time for the DKC-800.  If the issue persists, then I know it is really the power supply and I 'll take care of it at that point.  What do you guys think?

To view this discussion visit https://groups.google.com/d/msgid/disklavier-support-group/673F5CE8-C91C-4FB0-A4AB-02A926B60F7A%40gmail.com.

[sjhart]

It has been awhile since I replaced the part, but I don’t recall it being that difficult. I ordered the part directly from Yamaha.  My piano tech told me he has done several of these and that it was a common repair.  He would have done it for me, but would have charged accordingly.  My unit would regularly go in and out of standby… 

On Mar 12, 2025, at 1:45 AM, J Grospe <mail...@gmail.com> wrote:



I found online another DKC-800 user that has the same issue as mine-  intermittent reboots - and the solution was to replace the USB board.  It makes me think now that it is indeed the actual culprit.  TAP Electronics was insisting (suspiciously to me) that they'd clean my DKC-800 unit for $50 while they worked on the power supply (for $850).  

1.  To SJ Hart who had done this before:  How hard was it to remove and replace the USB Board Part No. WN757300? Did you order the part from Yamaha?

2.  To everyone: Would you recommend for me to just buy the DKC-900 since I'm looking to upgrade anyway?  At least, if the intermittent reboot issue is fixed, then I'd be able to save parts money and repair time for the DKC-800.  If the issue persists, then I know it is really the power supply and I 'll take care of it at that point.  What do you guys think?

On Thu, Feb 27, 2025 at 4:34 PM SJ Hart <sjha...@gmail.com> wrote:

I had a similar problem (on my DKC-850), but it turned out that the on/off switch and circuit was bad (according to my piano tuner/tech).  I ended up ordering this part from Yamaha and installed it myself.  Not sure if you have the same issue and I only ordered the part because my tech was pretty confident it was the issue.   The part I ordered for my issue was:

To view this discussion visit https://groups.google.com/d/msgid/disklavier-support-group/CALqeXJS9N9P%3D4NgjRay-du_gkVsA-CZiniGrZa1k52xyJBNcCQ%40mail.gmail.com.

[Peter S.]

Not sure if it is still useful, but I had similar issues with my E3. Part of the issue was the 48V power supply (the E3 has both 12V and 48V supplies) that had an electrolytic capacitor that gradually broke down. After replacing the power supply by myself, I also upgraded to DKC-900 and now things are working well. I still have an intermittent soft PD thermo error,  probably related to the soft pedal actuation circuit, since it occurs even after unplugging the soft PD solenoid from the control board. 

[Peter S.]

For reference in case others have the same power supply issue: I replaced the orginal (obsolete) TDK-Lambda ZWS 150PAF48 supply in the E3 with a newer model ZWS150BP48. I had to drill some new holes in the metal supply case to fix it properly, since it is smaller. The E3 cables can be just plugged in, but it does not have the option to connect the 2 pin control cable (CN3 on schematic), so I now switch the piano off with the switch on the backside to prevent having the 48V supply always on).

[Joel Grospe]

Hi Peter:

This is great! I still have not brought my E3 power supply and DKC-800 components to TAP Electronics in Buena Park, California. 

If what you’ve done on your E3 can only be documented on YouTube or whatever format, it would be golden for most of us DIY people here! 

Thank you so much for sharing such a valuable insight on the E3 power issue. 

Thanks again!

Best regards,

Joel Grospe 

San Clemente, California 

On Oct 25, 2025, at 4:57 AM, Peter S. <peterst...@gmail.com> wrote:

For reference in case others have the same power supply issue: I replaced the orginal (obsolete) TDK-Lambda ZWS 150PAF48 supply in the E3 with a newer model ZWS150BP48. I had to drill some new holes in the metal supply case to fix it properly, since it is smaller. The E3 cables can be just plugged in, but it does not have the option to connect the 2 pin control cable (CN3 on schematic), so I now switch the piano off with the switch on the backside to prevent having the 48V supply always on).

To view this discussion visit https://groups.google.com/d/msgid/disklavier-support-group/02a9bd8e-42b4-4af9-a353-258d8aa4817en%40googlegroups.com.

[Peter Steeneken]

Dear Joel,

Attached a pdf guide of what I did. I did not want to open the PSU now it works, but I think the instruction is clear enough. In any case only work on power supplies if you know what you are doing, because it can be dangerous.

Best,

Peter

Op za 25 okt 2025 om 22:09 schreef Joel Grospe <mail...@gmail.com>:

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[Joel Grospe]

Wow, this is amazing, Peter! So much appreciated, thank you, thank you!!!

 I’m in church but will check it out when I get home. 

Regards,

Joel

On Oct 26, 2025, at 1:36 AM, Peter Steeneken <peterst...@gmail.com> wrote:



To view this discussion visit https://groups.google.com/d/msgid/disklavier-support-group/CAEC6CcZJTvwg3bm8d-NUOUbZFgFYHQHXoC46GdiWO2NfraF86g%40mail.gmail.com.

<E3_48V_PSU.pdf>

[Mark Fontana]

Thanks Peter for taking the time to document this for the rest of the Disklavier community!

[Peter S.]

Sure, hopefully it is of use to some, and most of you won't have broken 48V power supplies.

[Joel Grospe]

Peter!

Absolutely great documentation and very much appreciated!!!  Thank you! Thank you! Thank you!

I’m in the United States and availability of the updated part seems to be a challenge for me— at least based on my searching online.

If anyone here knows where I can get the part, that would be so awesome!  I have a friend from Norway who might be able to order from EU, supplier information there in EU would also be great!

Here’s the part number again:

TDK-Lambda ZWS150BP48

Thanks all!

Joel Grospe 

San Clemente, California 

USA

On Oct 30, 2025, at 12:47 PM, Peter S. <peterst...@gmail.com> wrote:

Sure, hopefully it is of use to some, and most of you won't have broken 48V power supplies.

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[Peter Steeneken]

In Europe it also seems to be out of stock unfortunately (delivery time in 19 or 21 January 2026). 

You might still try the distributor inventor contact button/form from TDK website:
https://product.tdk.com/en/search/list#pn=ZWS150BP-48

Maybe there are alternative supplies, but I could not find anything that is a really easy replacement, also as the ZWS150BP-48 features a 200% peak power capability which seems quite unique. Not sure how important it is, but it seems significantly more expensive and larger than other 48V 150W supplies.

Best,

Peter

Op do 30 okt 2025 om 21:39 schreef Joel Grospe <mail...@gmail.com>:

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[Peter Steeneken]

Best alternative that is on stock seems to be: ZWS150BAF-48, but the 48V output cable seems not fully compatible (+ and - terminals need separate connectors, so you would have to take them out of the JST connector and reconnect them to 2 separate JST connectors).

Op do 30 okt 2025 om 23:36 schreef Peter Steeneken <peterst...@gmail.com>:

[Robert Hakim]

Hey I searched eBay for

TDK-Lambda ZWS150BP48

and plenty came up in China and Hong Kong. Have a look. Good luck. 

Bob

To view this discussion visit https://groups.google.com/d/msgid/disklavier-support-group/EF32C3FC-A988-4ADE-8E34-FCBEE100A90F%40gmail.com.