Canon MX870 Series User Manual page 502

Starts scanning.
Note
Click Cancel to cancel the scan.
When a duplex type is selected for Document Type, the Manual Duplex Scanning dialog box opens
after scanning. Continue to scan the back sides of the documents.
When a simplex type is selected for Document Type, the Scan Complete dialog box opens after
scanning. Skip ahead to Step 9.
Note
When the Automatic Duplex Scanning checkbox is selected in the Scan Settings dialog box, the
Manual Duplex Scanning dialog box does not open. Both sides of the documents are scanned
automatically. See "Scanning Both Sides of Documents at One Time
Follow the on-screen instructions to place the documents.
7.
When Short Edge is Selected for the Stapling Side in Orientation...
Place the documents without changing the orientation of the output documents.
When Long Edge is Selected for the Stapling Side in Orientation...
Place the documents after rotating the output documents 180 degrees.
" for details.