Canon iR C6800 Series Portable Manual page 44

Chapter 1
2-7 Fit the drum stop tool [1] in the drum flange [2]; then, turn the drum counterclockwise by 90 deg.
[1]
90
[2]
F-1-9
1: When fixing the tool to the flange, be sure to turn the drum only after matching the protrusion [2] of the tool against
the cut-off [1] of the drum flange.
[1]
[2]
F-1-10
2: The drum phase position is identified by means of a marking of 1 to 4 dots on the flange. At time of shipment from
the factory, dent A in the drum shaft is between "." and "..".
The following figures show the position of the drum flange before an after a shift is introduced:
1-28