HP Color LaserJet 5500 Service Manual - Page 161
Motors and fans, Drum Motor Control
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Motors and fans The printer has twelve motors, including three fans. Nine of the motors are DC motors; the other three are stepping motors. Figure 5-4. Motors and fans shows the locations of the motors and fans. Table 5-2. Function of motors and fans explains the function of each component. Six of the nine DC motors and two of the stepping motors are used for paper feeding and image formation. The remaining three DC motors are fan motors. The remaining stepping motor is the developing disengaging motor. Since the printer transfers an image in four colors in line onto the paper, small changes in the rotational speed of the motor are likely to cause color misalignment. The DC motors used for image formation are precisely controlled to account for rotational speed fluctuation. For the HP Color LaserJet 5550 models only: Drum Motor Control The main CPU determines a failure, stops the printer engine, and notifies the video controller under the following conditions: ● Drum startup abnormality. When the printer does not enter MOTOR READY state within 6.6 seconds from the start of the drum motor drive. ● Drum motor rotation abnormality. When the printer enters MOTOR NOT READY state for 6.6 seconds continuously after it has entered the MOTOR READY state. Fixing motor control ENWW Engine control system 139
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