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70 Theory of operation Q2431-90912
Motor and fan control
The HP LaserJet 4200 printer has three dc brushless motors. The main motor, the lifter driver
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 4300 printer has 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 photo sensitive drum (the photosensitive drum used in the
larger HP LaserJet 4300 print cartridge is heavier than the one used in the HP LaserJet 4200
printer). The lifter motor raises the plate in the tray cassette. Two fan motors rotate the left- and
right-side fans.
The DC controller PCA controls the operation of the motors and fans.
Table 31. Printer fans and motors
Motor names Purpose Type Rotation Speed Failure
detection
Motor Main motor (M101)
HP LaserJet 4200
Drives the tray cassette
pickup roller, feed/
separation roller, tray 1
pickup roller, pre-
transfer roller,
photosensitive drum,
developing cylinder,
pressure roller, and
output delivery roller
dc
motor
Counter
clockwise
2-speed
(full and half)
Ye s
Main motor (M101)
HP LaserJet 4300
Drives the tray cassette
pickup roller, feed/
separation roller, tray 1
pickup roller pre-
transfer roller, pressure
roller, and output
delivery roller.
dc
motor
Counter
clockwise
2-speed
(full and half)
Ye s
Print cartridge
motor (M102)
HP LaserJet 4300
Drives the transfer
charging roller,
photosensitive drum,
and developing
cylinder.
dc
motor
Counter
clockwise
2-speed
(full and half)
Ye s
Lifter motor (M103)
HP LaserJet 4200
HP LaserJet 4300
Moves the tray cassette
lifting plate up and
down.
dc
motor
Counter
clockwise
1-speed Yes
Fan Left-side cooling
fan (FN101)
HP LaserJet 4200
HP LaserJet 4300
Cools the inside of the
printer
dc
motor
NA 2-speed
(full and half)
Ye s
Right-side cooling
fan (FN102)
HP LaserJet 4300
Cools the inside of the
printer.
dc
motor
NA 1-speed Yes