Canon NP6412 Service Manual page 468

CHAPTER 2 STANDARDS AND ADJUSTMENTS
3) Turn on the machine, and place the test sheet prepared in step 1) on the original tray.
4) Press the Copy Start key to make a copy.
5) Check to make sure that the distance L4 on the copy image indicated is 10 +2.0, -2.5 mm
(standard) or less.
2-32
Figure 2-53
L4
Copy image
L4 =10±2.0mm
Figure 2-54