HP Color LaserJet CM4730 Service Manual - Page 195
Developing cylinder disengaging control, ETB (electrostatic transfer/transport belt)
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Motor rotation (rpm) Predetermined time Motor stop time Motor rotation (rpm) Motor ON Time (t) Motor OFF Specified time (T) Motor ON Time (t) Motor OFF Specified time (T) < Cartridge presence > Figure 4-27 Photosensitive drum detection < Cartridge absence > Developing cylinder disengaging control The developing cylinder is engaged or disengaged when the DC controller drives the developing alienation motor. When the developing motor rotates clockwise by a command from the DC controller during power on, printing operation stopped, cleaning cartridges, and monochrome print, the developing alienation cam rotates. Accordingly, the rear bottom of the cartridge is raised and the developing cylinder is disengaged from the photosensitive drum with a principle of leverage. The developing alienation sensor (SR11) detects the position of the developing alienation block. NOTE: Only the developing cylinders in the color cartridges (C, Y, M) are disengaged in monochrome print, and all of the developing cylinders in any other case. If the cam stays at its home position for the prescribed period of time or longer during the developing cylinder disengagement operation, or it does not return to the home position within the prescribed period of time after alienation is completed, the DC controller detects the developing alienation motor abnormality, stops the printer engine, and notifies the formatter of the developing alienation motor abnormality. ETB (electrostatic transfer/transport belt) The ETB feeds the media through the MFP and helps transfer toner onto the media. Figure 4-28 ETB on page 176 illustrates the ETB. ENWW Image formation system 175
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