Paper Eject; Duplex Printing - Brother mfc8440 Service Manual

CHAPTER 3 THEORY OF OPERATION
2.3.3

Paper eject

After the printing image on the photosensitive drum is transferred onto the paper, the paper is
fed to the fixing unit to fix unfixed toner onto the paper.
Afterwards, the paper is ejected from the fixing unit by the first eject roller in the fixing unit.
The paper eject actuator detects whether the paper is ejected correctly or not.
After the paper exits from the first eject roller, the paper is turned by the rear cover and ejected
face down into the top output tray through the second eject roller. If the rear cover is open, the
paper is ejected face up straight to the printer rear (straight paper path).
2.3.4

Duplex printing

After the paper exits from the second eject roller with the front of sheet printed, the second
eject roller rotates conversely and feeds the paper to the duplex tray, where the paper skew is
adjusted.
Afterwards, the paper is ejected from the duplex tray to the path through the paper feed roller
and the transfer roller to the transfer block in the drum unit again for process of printing on the
back of sheet.
Paper cover
Paper outer guide
Paper guide
First eject roller
Pressure roller
Rear cover
Second eject roller
Transfer roller
Duplex tray
Second eject roller
First eject roller
Fig. 3-23
Heat roller
Rear registration
sensor lever
Paper feed roller
Fig. 3-24
3-16
Paper eject actuator
Photosensitive drum
Paper feed pinch roller
Front registration sensor lever