Strange plastic thing on Pioneer DJM600 fader

DJ Life & Community General Discussion
1

Strange plastic thing on Pioneer DJM600 fader

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… :stuck_out_tongue:).

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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I might be wrong, but it looks like a feature for a fader-start switch.

The black plastic blocks the optocoupler, and a circuit is connected or broken.
That somehow tells something in the mixer to do something or the other.

Probably fader-start, but it could be something internal.

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It is indeed the fader start.