Canon iR1020 Series Service Manual page 200

The specified end registration is 10mm +/-2mm.
Leading edge margin
L
(feeding direction)
Copy of the test sheet
F-13-13
The image is shifted to the left. -> Decrease the value.
The image is shifted to the right. -> Increase the value.
Unit of adjustment 1 = 0.1 mm
3) Enter the service mode.
Sequentially press the Additional functions key, 2 key, 8 key, and Additional functions key on the operation panel of the host machine.
4) Using the arrow keys on the operation panel, display "#SCAN".
5) Press the OK key.
6) Using the arrow keys on the operation panel, display "#SCAN NUMERIC".
7) Press the OK key.
8) Using the arrow keys, select "42".
9) Using the numeric keys, change the value to determine the optimum value. Next, press the OK key. (Default: 219)
If the registration cannot be set to the specified value using software, make adjustments again starting with the perpendicular adjustment.