FeedbackLoop | #98 - Roland V-Accordion FR-7x repair @feedback-loop | Uploaded 4 years ago | Updated 12 hours ago
The instrument did not have sound through the speakers. The problem was diagnosed to be in the power supply of the amplifier. A step-down converter chip by Linear Technology has failed. The chip was replaced, and the accordion is back in business.

LT3693 datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/3693f.pdf
Renesas M61571AFP datasheet: https://docs.rs-online.com/d208/0900766b80c2e096.pdf