Canon NP6512 Service Manual page 45

Example:
If L4 is 13 mm,
You must shift the original stop position toward the leading edge by 3 mm.
1) Place a sheet of A4 or LTR white copy paper on the original tray.
2) Shift bit 1 of the DIP switch (SW1) on the ADF controller PCB to ON; then, push the push
switch (PSW) to pick up the copy paper.
3) Turn the rotary switch (SW2) on the ADF controller PCB clockwise by 10 notches.
CHAPTER 2 STANDARDS AND ADJUSTMENTS
0
ON
1 2
ON
1 2
SW1
Figure 2-58
0
ON
1 2
SW2
Figure 2-59
2-35