HP LaserJet Enterprise 600 Service Manual - Page 31

Operating sequence A microprocessor on the DC controller PCA controls the product operating sequence. The following table describes the basic operating sequence from when the product power is turned on until the final printed page is delivered to an output bin. NOTE: The product takes about two minutes and twenty seconds to initialize. Table 1-1 Product operating sequence Period Duration Operation WAIT STBY (Standby) From the time the power is turned on, the ● door is closed or Sleep mode is released until the product gets ready for a print ● operation. ● From the end of WAIT or LSTR period ● until either the print command is received from the formatter or the power button is ● turned off. Brings the product to standby condition. Pressurizes the fuser pressure roller. Detects the print cartridge. Maintains the product in printable condition. Puts the product in Sleep mode when the formatter sends a sleep command. INTR (Initial rotation period) From the time the print command is received from the formatter until the media is picked up. Starts up each high-voltage bias, laser/scanner unit, and fuser for printing. PRINT From the end of INTR period until the last ● Forms the image on the photosensitive drum based on the paper completes the fixing operation. signals from the formatter. LSTR (Last rotation period) From the end of PRINT period until the motors stop rotating. ● Transfers and fuses the toner image to the print media. ● Moves the last printed sheet out of the product. ● Stops the laser/scanner unit operation and high-voltage biases. The product enters the INTR period as soon as the LSTR period is completed, if the formatter sends another print command. ENWW Basic operation 7