HP Color LaserJet Professional CP5220 Service Manual - Page 15

Sequence of operation The DC controller in the engine-control system controls the operational sequences of the product. The following table describes durations and operations for each period of a print operation from when the product is turned on until the motor stops rotating. Normal sequence of operation Table 1-1 Sequence of operation Name Timing Purpose WAIT From the time the power switch is turned on, the door Brings the product to printable condition: is closed, or the product exits Sleep mode until the product is ready for a print operation. ● Detects and heats the fuser ● Detects the print cartridge and any cartridge changes ● Detects the ITB, and moves the ITB and the developing unit to the home position ● Cleans residual toner from the ITB and the secondary transfer roller STBY (standby) From the end of the WAIT or LSTR period until either a print command is sent or the power switch is turned off. Maintains the product in printable condition: ● Enters Sleep mode if the sleep command is received ● Performs a calibration if the calibration command is received INTR (initial rotation) From the time the print command is received until the Prepares for the print job product picks up a piece of paper. ● Activates the high-voltage power supply ● Activates the laser scanner ● Opens the laser shutter ● Cleans the protective laser glass ● Engages the print cartridges ● Warms the fuser ENWW Basic operation 3