Fine Adjust Zoom
When copying, a slight difference in size may occur between the size of the original image, and the size of the copied image. In this case, you can perform a fine adjustment to compensate for this difference.
This mode can be set when the Duplex Color Image Reader Unit-F1 is attached. (See "Duplex Color Image Reader Unit-F1 (imageRUNNER ADVANCE C9280 PRO/C9270 PRO)" or "Duplex Color Image Reader Unit-F1 (imageRUNNER ADVANCE C7270/C7260).")
1.
Press 
(Settings/Registration).
(Settings/Registration).2.
Press [Adjustment/Maintenance] → [Adjust Image Quality] → [Fine Adjust Zoom].
3.
Press [-] or [+] to adjust the percentage (%) → press [OK].
If you want to adjust only the X (horizontal) or Y (vertical) direction, press [-] or [+] to enter a value for that direction only.