HP Color LaserJet CM2320 Service Manual - Page 96
Sequence of operation
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Sequence of operation Table 5-1 Sequence of operation Period Duration Operation WAIT From the time the power is turned on, the door is closed, or the Sleep mode is released until the product gets ready for a print operation. This period brings the product to printable condition. During this period the product performs the following actions. ● Detects the pressure roller pressurized status ● Detects the presence of each cartridge and unit ● Determines the home position of the development unit ● Cleans the ITB ● Completes any required calibration, such as color misregistration and image stabilization control STBY (Standby period) From the end of the WAIT or LSTR period until either the print command is received from the formatter or the power is turned off. This period maintains the product in printable condition. During this period the product performs the following actions. ● Enters sleep mode when the formatter sends a sleep command ● Completes any required calibration, such as color misregistration and image stabilization control, when the formatter sends those commands INTR (Initial rotation) From the time the print command is received from the formatter during the STBY period until the temperature of the fuser unit reaches the targeted temperature. The product starts each high-voltage bias, laser-scanner unit, and fuser unit for in preparation for a print operation. PRINT From the end of INTR period until the last The product forms the image on the photosensitive drum sheet of media completes the fusing based on the video signals from the formatter, and then operation. transfers and fuses the toner image to the print media. The product performs color misregistration control and image stabilization control at a specified print interval after the product is turned on. LSTR (Last rotation) From the end of the PRINT period until the The product moves the last printed sheet out of the product, motors stop rotating. and then it stops the laser-scanner unit operation and the high-voltage biases. The product enters the INTR period as soon as the LSTR period is completed, if the formatter sends another print command. 84 Chapter 5 Theory of operation ENWW