Canon LBP 2460 Service Manual - Page 48

CHAPTER 2 B. Basic operation sequences Operation sequences of the printer are controlled by the microcomputer on the DC controller PCB. Descriptions of each period from ON until the main motor stops are as shown below. See the appendix for timing chart. Table 2-1-1 WAIT (WAIT period) Period From power-ON until the fixing roller temperature reaches 170˚C . (Less than 80 sec.) STBY (STANDBY) From the end of the WAIT period until a /PRNT signal is input from the video controller, or from the end of the LSTR period until a /PRNT signal is input from the video controller or until the power is switched OFF. INTR (INITIAL ROTATIONS period) PRINT (Print) After the /PRNT signal has been input from the video controller until the scanner motor becomes ready (about 7 seconds). From the end of the INTR period until the primary DC voltage switches OFF. LSTR (LAST ROTATIONS period) After the primary DC voltage turns OFF until the main motor stops. Purpose Warms up the fixing rollers to put the printer in the standby mode. Cleans the transfer charging roller. Maintains the printing temperature of the fixing roller so that the printer is ready to print. To stabilize the sensitivity of the drum in preparation for printing and to clean the transfer charging roller. To form an image on the photosensitive drum according to the VDO signal input from the video controller and to transfer the image to paper. To deliver the final page and to clean the transfer charging roller. Remark During this period, the printer checks if the cartridge is installed and if there is toner in it. If the printer stays in the standby mode for longer than five hours, it drives the main motor for one second to rotate the fixing roller, to prevent it from deforming. During this period, the printer maintains the printing temperature of the fixing rollers. If a /PRNT signal is input from the video controller, the INITIAL ROTATIONS period begins immediately. 2 - 2