Basic sequence of operation The operation sequences of this printer are controlled by the microprocessor on the engine controller board. The purposes of periods from power on until the main motor stops after the completion of printing are described below. Table 33. Printer timing Period Timing Purpose WAIT From power on until the main motor completes the initial rotation. Clears the drum surface potential and cleans the transfer roller. During this period, the printer checks the toner level and the presence of the cartridge. STBY (standby) From the end of the WAIT or the LSTR period until the input of the PRNT signal from the formatter. Or from the end of the LSTR period until power off.
Maintains the printer in ready state. INTR (initial rotation) From the input of the PRNT signal from the formatter until the engine controller sends the TOP signal. Stabilizes the photosensitive drum sensitivity in preparation for printing. Also cleans the transfer roller. PRNT (print) After the end of initial rotation until the top of the page sensor detects the trailing edge of the print media. Forms images on the photosensitive drum based on the video signals from the formatter and transfers the image to the print media. During this period, the printer checks the toner level. LSTR (last rotation) After the primary voltage (DC) turns off until the main motor stops.
Delivers the last sheet of print media and cleans the transfer roller. If another PRNT signal is sent from the formatter, the printer returns to the INTR period. If not, it returns to the STBY period. 130 Theory of operation EN