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Do you see a " manual reverse option" button anywhere?
You may have to remove a cover, and look for a spot you can move a roller.
Kind of like the ends of a typewriter, where the paper is held, you can roll the end, to change the position of the paper.
Same concept applied here.
But only if yours has the MANUAL reverse option.
Its actually not a button, its more like a roller, or a lever that rolls.
COuld be concealed, under a cover, or sticking out, very obvious. Just depends on your model.
I cant find an image of yoru model