Unlike full E3 systems, the DKC-800 and DKC-850 piggybacked upgrades are powered by external AC adapters, such as the PJP-PS02. The original Yamaha Disklavier E3 installations use the Disklavier’s power supply, but these piggybacked installations require their own source of power.
I recently had a customer reach out to me using an aftermarket power adapter, and his DKC-800 would not power on. He later tried another adapter, and got it to work. But trying random power adapters is dangerous!
The Original Power Adapter
The DKC-850 upgrade system shipped with the PJP-PS02 or PJP-PS04 power adapter. This is now discontinued. However, the replacement is Yamaha part number ZT935300. The easiest place to purchase is on Yamaha 24×7 or call (888) 892-6242.
The model of power adapter is I.T.E. MU24-Y120200-A1. Although it can be sourced from other suppliers, the Yamaha model has a unique adapter tip.
There’s an additional complication with this power adapter. The official Yamaha part is ungrounded, and that is a requirement. I’ve had multiple electrically knowledgeable technicians attempt to use replacement adapters that were adequately rated, but which altered the Disklavier’s reference ground and resulted in very poor playback.
Why Order the Genuine Yamaha Adapter?
Exact electrical spec. 12 V DC, ≥2 A, center-positive, 5.5 mm × 2.5 mm barrel—no guesswork. Trying random power adapters just because they fit is a poor policy.
Warranty integrity. Yamaha’s U.S. Disklavier warranty (see the official policy) allows only Yamaha-approved parts. A third-party power adapter can complicate future claims.
Protect Your New Adapter (and Piano) from Surges
A clean power brick won’t help if the AC line spikes. Pair the new ZT935300 with a properly sized surge suppressor to avoid future failures. Read my guide to surge protectors for Disklaviers to keep your piano—and its power supply—safe during storms and other electrical events.
Subject: Professional Assistance Requested: Yamaha Disklavier (DKC-500RW) Repair – Hyderabad, India
Dear Alexander,
I hope you are doing well.
My name is Srinivas, and I run a Yamaha Authorized service center for Pro Audio and MI (SV Electronics) in Hyderabad, Telangana, India. I am reaching out to you because of your extensive expertise as an authorized Yamaha technician and your reputation for restoring complex digital and acoustic systems.
I am currently working on a Yamaha Disklavier with a DKC-500RW control unit located at the in Hyderabad. India, The instrument is presenting a specific mechanical/electronic issue:
The Problem: Certain keys within specific octaves are not functioning properly.
Symptoms: Intermittent playback where some keys occasionally fail to strike or respond during a sequence.
Given your experience with Yamaha products, I was hoping you might be able to offer some guidance or troubleshooting steps for this specific model. I am particularly interested to know if you suspect a sensor rail issue, a solenoid malfunction, or perhaps a known electronic fault common to the DKC-500RW system. Plz provide Service manual for DKC-500RW
I also noticed you are an amateur radio operator—it’s great to connect with a fellow technical enthusiast! (73 to WS1Q).
Thank you very much for your time and for any insights you might be able to share.
Best regards,
Srinivas SV Electronics Hyderabad, Telangana, India Mobile: +91-9441090165
Hello Srivinas! I just replied to you by email, as this warrants a more detailed discussion. Thank you!