raise the upper transport unit fully, then lower the transport to engage lock before you put your hands inside of the scanner.
2. pull the adf release lever toward you and lift up the adf upper sheet guide.
3. pressing down on the upper part of the guide plate with your fingers at the two positions shown and then rotate the plate toward you to remove it.
4. wipe the translucent rubber part of the pad assy using a lint free cloth moistened with cleaner f1.
5. install the guide plate in the reverse order of the removal.you should push it down then push back, so the installation can be done smoothly.
6. lower the adf upper sheet guide carefully.
7. lift the upper transport unit to release the safety lock and then lower the transport unit carefully.