HP LaserJet Enterprise 500 Service Manual - Page 39

Sequence of operation The DC controller PCA controls the operating sequence, as described in the following table. NOTE: The terms fusing and fixing are synonymous. Table 1-1 Sequence of operation Period Duration Description Waiting From the time the power is turned on, ● Heats the fuser sleeve the door is closed, or when the product exits Sleep mode until the product is ● Pressurizes the fuser pressure roller ready for printing ● Detects the print cartridges ● Detects the home position for the primary transfer roller and the developing unit ● Cleans the secondary transfer roller Standby From the end of the waiting sequence or ● the last rotation until the formatter receives a print command or until the ● product is turned off ● The product is in the READY state. The product enters Sleep mode after the specified length of time. The product calibrates if it is time for an automatic calibration. Initial rotation From the time the formatter receives a ● print command until the paper enters the paper path ● Activates the high-voltage power supply Prepares each laser/scanner unit ● Warms the fuser to the correct temperature Printing From the time the first sheet of paper ● Forms the image on the enters the paper path until the last sheet photosensitive drums has passed through the fuser ● Transfers the toner to the paper ● Fuses the toner image onto the paper ● Performs calibration after a specified number of pages Last rotation From the time the last sheet of paper exits the fuser until the motors stop rotating ● Moves the last printed sheet into the output bin ● Stops each laser/scanner unit ● Discharges the bias from the highvoltage power supply ENWW Basic operation 3