Brother MFC-8220, Service Manual

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MFC-8220
SERVICE MANUAL
3-15
2.3 Paper Transfer
2.3.1 Paper supply
The paper pick-up roller picks up one sheet of paper from the paper tray every time it is rotated
and feeds it to the paper feed roller.
Fig. 3-21
The paper is gripped between the paper pick-up roller and the separation pad and separated
into individual sheets.
The pick-up roller is directly connected to the clutch mechanism, whose rotation is stopped by
the stopper arm. When the pick-up solenoid is activated, the clutch mechanism is engaged by
the solenoid action and the paper pick-up roller is driven. The paper drawn out of the tray by
the pick-up roller pushes against the regist front actuator and the paper top position/absence of
paper is detected by sensing the motion of the actuator.
2.3.2 Paper registration
After the paper top position is detected by the regist front actuator, the paper, separated into
individual sheets by the paper pick-up roller, is fed further for a specified time, and the paper
top position reaches the paper feed roller so that the paper skew is adjusted. Then, the
solenoid is turned off, the paper feed roller starts turning, and the paper is fed to the transfer
block in the drum unit.
Fig. 3-22
The regist rear actuator in the path from the feed roller to the transfer roller controls the first
print position on the paper.
Paper feed pinch roller
Paper pick-up roller
Regist front
actuator
Paper feed roller
Pressure plate
Transfer roller
Regist front actuator
Separation pad
First feed pinch roller
First feed roller
Regist rear actuator
Photosensitive drum
Paper feed roller