Canon iR4570 Series Service Manual page 355

Chapter 8
COPIER>ADJUST>FEED-ADJ>ADJ-RE-L
Use it to adjust the horizontal registration for the 2nd side of large-size double-sided prints.
COPIER>ADJUST>FEED-ADJ>LOOPREFE
Use it to adjust the degree of arching for the 2nd side of double-sided prints.
Reference:
small-size: A4, B5, and the like, whose side in paper feed direction is shorter than that of LTR.
Large-size: A3, A4R, B5R, and the like, whose side in feed direction is longer than that of LTR.
The term "2nd side of a double-sided print" as used in relation to the machine's service mode refers to the side that
receives an image second in order; in other words, it corresponds to the 1st side of the original.
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