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I can't find it on a machine either, got a picture or description of where on the device you see it?
I have also seen this function on my Workcenter 6515 and can it be found when selecting from menu screen "Device, then Support" and is a selectable item either on or off, however I cannot find any reference to it either online or within the manual. I would like to know precisely what this item achieves and which part of the printer does it affect.