Canon Pro-1000 series Online Manual page 122

3. Open the paper output tray (C) gently.
4. Open the output tray extension (D), then pull out the paper output support (E).
5. Open the feed slot cover (F).
6. Slide the paper guides (G) to open them, and load the paper in the center of the rear tray
WITH THE PRINT SIDE FACING YOU.
7. Slide the paper guides (G) to align them with both sides of the paper stack.
Do not slide the paper guides too hard against the paper. The paper may not be fed properly.
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