HP 3380 Service Manual - Page 85

Basic sequence of operation (formatter-to-printer) The microprocessor (CPU) on the ECU controls the operation sequence of the printer. The following events take place during normal printer operation: Table 4-1. Basic sequence of operation (printer) Period Purpose Remarks WAIT. After the product is turned To clear the drum surface of on until the end of the initial potential and to clean the rotation of the main motor. primary charging roller. Detects whether or not the cartridge is installed. STBY (Standby). From the end of the WAIT period or the LSTR period until the pickup command is sent from the formatter. Or, from the end of the LSTR period until the product is turned off. To keep the product ready to print. INTR (Initial Rotation). After the pickup command has been sent from the formatter until the media reaches the pickup solenoid. To stabilize the photosensitive drum sensitivity in preparation for printing. To clean the transfer charging roller. PRINT (Print). From the end of the INTR period until the primary voltage goes off. To form images on the photosensitive drum based on the VIDEO signals (/VDO, VDO) that the formatter sends, and to transfer the toner image onto the media. LSTR (Last Rotation). After the To deliver the last page. primary voltage goes off until the main motor stops rotating. To clean the primary charging roller. When the formatter sends the pickup command, the printer enters the INTR period immediately after the end of the LSTR period. ENWW Basic sequence of operation (formatter-to-printer) 69