HP LaserJet 4250 Service Manual - Page 123
Motor and fan control
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Motor and fan control The HP LaserJet 4200 Series printers contain three dc brushless motors: the main motor, the lifterdriver motor (inside of the lifter-driver assembly), and a fan motor. The main motor is used for image formation (rotating the photosensitive drum in the print cartridge) and paper pickup and feed. The lifter motor raises the plate in the tray cassette. The fan motor rotates the fan blades. The HP LaserJet 4250, 4300, and 4350 Series printers contain five dc brushless motors: the main motor, the print cartridge motor, the lifter motor, and two fan motors. The main motor is used for paper pickup and feed. The print cartridge motor rotates the photosensitive drum. The lifter motor raises the plate in the tray cassette. Two fan motors rotate the left- and right-side fans. Table 5-2 Printer fans and motors Component Purpose Type Main motor (M101), HP LaserJet 4200 and 4200L Series printers Drives the tray cassette pickup Dc roller, feed/separation roller, tray 1 pickup roller, pre-transfer roller, photosensitive drum, developing cylinder, pressure roller, and output delivery roller Main motor (M101), Drives the tray cassette pickup Dc HP LaserJet 4250, 4300, roller, feed/separation roller, tray 1 and 4350 Series printers pickup roller pre-transfer roller, pressure roller, and output delivery roller. Print cartridge motor Drives the transfer charging roller, Dc (M102), photosensitive drum, and HP LaserJet 4250, 4300, developing cylinder. and 4350 Series printers Lifter motor (M103), all printer models Moves the tray cassette lifting plate Dc up and down. Left-side cooling fan Cools the inside of the printer Dc (FN101), all printer models Right-side cooling fan Cools the inside of the printer. Dc (FN102), HP LaserJet 4250, 4300, and 4350 Series printers Rotation Counterclockwise Counterclockwise Counterclockwise Counterclockwise NA NA Speed Two-speed (fulland half-speed) Two-speed (fulland half-speed) Two-speed (fulland half-speed) Single-speed Two-speed (fulland half-speed) Single-speed General descriptions 109