The 12V on my Commodore 1571 PSU was not working anymore. I bought a new PSU as replacement: https://www.meanwell-web.com/en-gb/ac-dc-triple-output-open-frame-power-supply-output-pt–65a The old PSU on C=1571 Disk Drive The new MW PT65-A:

Project: https://www.hackup.net/2018/07/pi1541io-revision-4/ Bougth from PCBWay: https://www.pcbway.com/project/shareproject/Pi1541_IO_Adapter__Rev_4.html