1. remove documents from the stacker first. pull up on the lever on the right front of the upper transport and then raise it.
raise the upper transport unit fully, then lower the transport to engage lock before you put your hands inside of the scanner.
2.wipe and clean the whole transport path using a cloth moistened with cleaner f1.
vacuum the transport path if there are paper dusts in the path.
do not use aerosol spray to clean the path.
do not use high pressure air to blow dust out of the scanner. this will contaminate the optics and mechanism.
3. lift the upper transport unit fully to release the safety lock and then lower the transport unit carefully.