Canon TS9500 Series Online Manual page 206

Loading Envelopes in Rear Tray
O: Paper Support
Extend to load paper in the rear tray.
P: Rear Tray Cover
Open to load paper in the rear tray.
Q: Feed Slot Cover
Prevents anything from falling into the feed slot.
Open it to slide the paper guides, and close it before printing.
R: Paper Guides
Align with both sides of the paper stack.
S: Document Output Slot
Documents scanned from the ADF are delivered here.
T: Document Tray
Open to load a document in the ADF. You can load two or more sheets of document of the same size
and thickness. Load the document with the side you want to scan facing up.
U: Document Guide
Adjust this guide to match the width of document in the ADF.
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