hi fellas yesterday i bought machine to customer and every thing is ok but after a few days he calls that 1 side=2 side signal is revealed.then i went the re and checked option (system setting and etc ...) there is no cue for this in spite of i mad this before in other machine like 2045 3045 2060 . and i haven't seen before it's print and scan without any sd cards.and some times its make acopy from two trays in the same time. and made waiting a few seconds like there is no toner in bottle .when i open it.or after rest . any clue