II-12
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.
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)
Stuck-full sensor
Figure 2.18
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