Canon imageRUNNERC1022 Service Manual page 211

(a) Standard position (All colors' transfer rollers are engaged)
When the transfer roller disengagement slider is placed at the standard position, all the transfer roller holders are placed at the lowest position of the slope, so
the all colors' transfer rollers are engaged with the ETB.
At the time of color printing or monochrome printing of the specified thick paper, all the transfer rollers are engaged with the ETB, so the transfer roller
disengagement slider is considered to be at the standard position.
(b) Downward position (Only black transfer roller is engaged)
When the transfer roller disengagement slider is placed at the downward position, the yellow (Y) transfer roller holder moves to the highest position along the
slope 1, so the transfer roller is disengaged from the ETB. The same applies to cyan (C) and magenta (M).
The black (Bk) transfer holder stays at the lowest position because the transfer roller disengagement slider has no slope. As a result, the transfer roller is engaged
with the ETB.
At monochrome printing, only the black (Bk) transfer roller is engaged with the ETB, so the transfer roller disengagement slider is placed at the downward
position.
Transfer roller
Bk
Photosensitive drum
ETB
Y(C,M)
Transfer roller
Bk
Photosensitive drum
ETB
Y(C,M)
Transfer roller holder
Slope
Transfer roller disengagement slider
Slope
F-8-29
Transfer roller holder
Transfer roller disengagement slider
Slope1
F-8-30
Chapter 8
8-23