HP LaserJet P4510 Service Manual - Page 123
Failure detection, Motor failure, Engine power supply, Fuser-control circuit, Motor start-up failure
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Table 5-2 Fans (continued) Description Cooling area Type Speed Cooling fan FN301 Cartridge area and laser/scanner Intake Full2 1 Cooling fan FN101 rotates at full speed for eight seconds when the product is turned on, and then decreases to half-speed for approximately 10 minutes. After that time period, if there is no print job in the print queue, the fan will stop completely. The fan rotates at full speed during a print job. 2 This fan operates at full speed only during a print job. Otherwise, it does not rotate. Table 5-3 Motors Description Feed motor (M101) Drum motor (M102) Fuser motor (M103) Lifter motor (M299) Driving parts Type Drives the Tray 1 pickup roller, Tray 2 pickup roller, and DC feed roller Drives the photosensitive drum, primary charging roller, DC and transfer roller Drives the pressure roller and feed roller-when rotated DC counterclockwise it releases the fusing pressure for easier jam removal Drives the lifting plate of the tray DC Failure detection Yes Yes Yes No Failure detection Motor failure The DC controller determines a motor failure and notifies the formatter when it encounters the following conditions: ● Motor start-up failure: The motor does not reach a specified speed within a specified period from when each motor starts up. ● Motor rotational failure: The rotational speed of the motor is out of a specified range for a specified period from when it once reaches a specified speed. Fan motor failure The DC controller determines a fan motor failure and notifies the formatter when the fan locks for a specified period from when each fan starts up. Engine power supply The power supply consists of the fuser-control circuit, the high-voltage circuit, and the low-voltage circuit. The fuser-control and high-voltage circuits control the temperature of the fuser and generate highvoltage according to signals from the DC controller PCA. The low-voltage circuit generates the DC voltages that other components in the product use (for example the DC controller PCA, the motors, and fans). Fuser-control circuit The fuser-control circuit controls the fuser components. The two fuser heaters provide the high temperatures that cause the toner to permanently bond to the media. The fuser thermistor monitors the ENWW Engine-control system 109