Canon ImageRunner iR8500 Series Service Manual page 452

Chapter 9
3. The 3rd side is printed on the 2nd sheet.
The 1st sheet is moved to the holding tray assembly.
The 3rd sheet is picked up.
4. The 1st sheet is moved to the reversing assembly.
5. The 1st sheet is moved to the lower feeding assembly.
The 5th side is printed on the 3rd sheet.
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