to scan negatives, transparencies or slides you use the transparency unit (tpu) of your arcus 1200. the tpu of your scanner is locked. you have to unlock this tpu before you can use it.

    1 open the tpu of the scanner.

    you can see the unlocking screw at the inside of the tpu.

    2 take a coin and turn the screw a quarter counterclockwise.

   

    the tpu is unlocked.