Basic print-period operating sequences The operation sequences of this printer are controlled by the microprocessor (CPU) on the engine controller printed circuit board (PCB). The table below describes the purpose of periods from power- on until the main motor stops when printing is complete. Table 25. Print period descriptions C7058-90936 Basic operations 71 Period Timing Purpose Remarks WAIT (wait period) From power-on until completion of the main- motor initial drive. Clears the drum surface potential and cleans the transfer charging roller. Detects whether the cartridge is installed or not.
STBY (standby period) From the end of the WAIT period until the print instruction command is received from the formatter, or from the end of the LSTR period until the print instruction command is input from the formatter, or until the power is switched on or off. Maintains the printer in a ready state. INTR (initial rotation period) From receipt of the print instruction command from the formatter until the media reaches the top-of- page sensor. Stabilizes the sensitivity of the photosensitive drum in preparation for printing. PRINT (print period) From the end of the INTR period until 1.2 seconds after the top-of-page sensor detects the trailing edge of the media.
Forms an image on the photosensitive drum in preparation for printing. LSTR (last rotation period) From completion of printing until the main motor stops rotating. Delivers the final page out of the printer and cleans the transfer charging roller. If a print instruction command is received from the formatter, the printer bypasses the WAIT and STANDBY periods and immediately enters the INTR period.