Yesterday i changed input faders on a Pioneer DJM600 mixer (which was a bit more difficult than I thought it would be. Cramped location, small screws, bent wires and plastic connectors... :P).
What puzzles me is the black thing on the slider, which goes into something that look like an optocoupler (you see an arrow there printed on the board, see fader-1.jpg, and some strange japaneese letters which might explain what it is... see fader-2.jpg). Out of curiousity I tried the mixer with it and without it, and I could at least not hear any difference.
Anyone have any ideas?
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