HP Color LaserJet Enterprise CP5525 Service Manual - Page 27

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 the time 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 is closed, or the product exits Sleep mode, until the product is ready for a print operation. Brings the product to printable condition: ● 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 intermediate transfer belt (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 product picks up a piece of paper. Prepares for the print job ● 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