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4. PAPER PICK-UP/FEED SYSTEM
4.1 Outline
If a tray1 paper pick-up roller solenoid drive signal (PUCL1) is input to the circuit while the paper
feed motor is rotating, the paper pick-up solenoid comes on and the paper pick-up roller solenoid
is engaged. As a result, the paper pick-up roller rotates to feed paper down to the photosensitive
drum.
The paper position is controlled by the registration sensor so that the leading edge of the paper
is aligned with the leading edge of the image on the photosensitive drum. After this operation,
the paper is deliveried to the face down tray via the fixing unit. Paper ejection is detected by the
paper ejection sensor; if printed paper has not reached or not cleared the paper ejection sensor
in a specified time, the printer judges that a paper jam has occurred. In this case a paper jam
is noticed to the external devise by a status signal.
Figure 2.18
Main PCB
Paper ejection sensor
Fixing rollers
Transfer roller
Main motor
Photosensitive
drum
Registration
sensor
Tray1 Pick-up
roller solenoid
Paper-
feed
motor
MP tray Pick-up
roller solenoid
MP tray
paper empty sensor
Tray paper
empty sensor
MP tray paper empty sensor signal (PEMP)
MP tray pick-up roller
solenoid drive signal (MPSOL)
Paper feed motor drive signal
Tray1 pick-up roller solenoid drive signal (PUCL1)
Tray1 paper empty sensor signal (PETRAY1)
Registration sensor signal (REGIST)
Main motor drive
signal (MDRIVE)
Paper ejection sensor signal (EJECT)