Brother International HL-1660E Service Manual - Page 28

MP tray paper empty sensor MP tray Pick-up roller solenoid Tray paper empty sensor Tray1 Pick-up roller solenoid Paperfeed motor 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. 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) Figure 2.18 II - 12 Main PCB Registration sensor Transfer roller Main motor Photosensitive drum Fixing rollers Paper ejection sensor