A silver metal cans with two black and blue wire remains protruding at one end. The text on the can is partially in German and says "Funk-Entstörfilter". The value is 0.1uF+2x2500pF XY +2x100uH 250V~2A The device was made in West Germany

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   root42 (root42@chaos.social)'s status on Sunday, 26-May-2024 01:50:40 JST root42

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   And here ist the culprit. A mains filter to avoid RF feeding back into the grid. It used to be mandatory back in the day, but isn't used quite that often anymore. This specific type of filter is very hard to find nowadays, and IIRC my other CBM machines don't have one either. So I guess I will skip this and wire up N and L as shown in the schematics.