IMAGE TOO DARK ON GEI GRAPHIC ZOOMER POSTER BANNER SYSTEM

First I would give the optical area a good cleaning --- mirrors, lens, etc.. If this device has the 'slide' adjust for the image quality, the slide may have come out of the holder. Try seeming if the slide is seated properly. If this is the 'thumb / circle ' adjust, the POT ( value adjust on the board) may need to be reset. There is always the chance the the board is cracked or has a cold solider joint (pins) for the adjuster. IF you are inclined, that the cover off and check for crack, if no crack heat and re-solider the pins for the adjust switch.