HP LaserJet 3200 Service Manual - Page 84

Basic sequence of operation (formatter-to-printer) The formatter and the ECU share information during printer operation. The ECU-to-formatter connector (J201) forms a link that operates as a serial data bus. This allows printer status, command information, and dot-image data to be passed between the two. The following events take place during normal printer operation: Period WAIT From the power-ON until the end of the main motor initial rotation. STBY (Standby) From the end of the WAIT period or the LSTR period until the pickup command is input from the formatter. Or, from the end of the LSTR period until power-OFF. INTR (Initial Rotation Period) After the pickup command has been input from the formatter until the paper reaches the paper top sensor. PRINT (Print) From the end of the initial rotation until the primary voltage goes OFF. LSTR (Last Rotation Period) After the primary voltage goes OFF until the main motor stops rotating. Purpose To clear the drum surface of potential and to clean the transfer charging roller. To keep the printer ready to print. To stabilize the photosensitive drum sensitivity in preparation for printing. Also to clean the transfer charging roller. To form images on the photosensitive drum based on the VIDEO signals (/VDO, VDO) input from the formatter and to transfer the toner image onto the paper. To delivery the last page. Also to clean the transfer charging roller. Remarks Detects whether or not the cartridge is installed. When the pickup command is input from the formatter, the printer enters the INTR period immediately after the end of the LSTR period. 82 Chapter 4 - Operational overview EN