Canon imageRUNNERC1022 Service Manual page 212

Chapter 8
(c) Upward position (All colors' transfer rollers are disengaged)
When the transfer roller disengagement slider is placed at the upward position, the transfer roller holder moves to the highest position along the slope 2, so the
all colors' transfer rollers are disengaged from the ETB.
Detection of the condition
The engagement/disengagement condition of the transfer roller is detected when the power is turned ON or when the front cover is closed.
The DC controller measures the voltage of the transfer rollers for magenta (M) and black (Bk), and detects the engagement/disengagement condition of the transfer
rollers based on the measurement result.
If the change of engagement/disengagement could not be confirmed when the engagement/disengagement condition of the transfer rollers was detected again after
the transfer roller disengagement slider was moved, the DC controller measures the voltage of the transfer rollers again (retry control).
Error Codes:
E078 Transfer disengagement mechanism abnormality
When the engagement/disengagement condition could not be detected correctly after retry control was executed, the machine stops operation and displays
the error code on the control panel.
8-24
Transfer roller
Bk
Photosensitive drum
ETB
Y(C,M)
Slope2
Transfer roller holder
Transfer roller disengagement slider
Slope2
F-8-31