power supplies

Yamaha Disklavier Power Supplies: Diagnosing & Rebuilding

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Over the years, I’ve replaced the power supplies on most of the Mark II generation Disklaviers I’ve worked on. These second-generation Disklaviers are terrific instruments—until the original power supply quits. When it does, the piano either won’t turn on, whines loudly, or randomly shuts off after running for a short period of time. Power supply … Read more

Replacement for Roland ACN-120, PSB-4U, and PSB-4UREPL

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Last week a customer wrote in about his older, beloved Roland E-16 that had begun humming and would occasionally reboot. This was caused by a poor power adapter. As power adapters age, they can become unreliable, and often introduce humming or erratic behavior. I’ve put together a search tool for Roland power adapters, but I … Read more