HP 4700n Service Manual - Page 157

Table 5-1 Basic operation sequence Period Purpose Remark WAIT (wait period) From the time the power switch is turned on until the ETB cleaning is completed. To clear a potential on the drum surface and to clean the ETB. During this period, the printer checks the toner level and detects whether the cartridges are present. The printer also executes the pulse width modulation adjustment, color registration adjustment, and image density calibration control as required. STBY (standby period) INTR (initial rotation period) PRINT (print period) From the end of the WAIT or LSTR period or last rotation until the formatter inputs a print command or until the power is turned off. To keep the printer ready to print. When the formatter sends a sleep command, the printer enters sleep mode. From immediately after the formatter inputs a print command until the TOP signal is sent to the formatter. To stabilize the photosensitive drum sensitivity in preparation for a print operation. From the end of the INTR period until the leading edge detection sensor detects paper and then turns off the transfer positive bias. To form an image on the photosensitive drum according to the video signal input from the formatter and to transfer the toner image to the paper. After the power is turned on, the cartridge is cleaned every 35 pages and the ETB is cleaned every 100 pages. LSTR (last rotation period) From the end of the PRINT period until the drum motor stops. To deliver the paper out of the printer and to clean the ETB. The last rotation period lasts until the instant the formatter sends a print command. Then the initial rotation period starts again. Power on sequence The power on sequence initializes the printer and checks for possible malfunctions or paper jams. Figure 5-2 Power on sequence on page 138 shows the printer status from power on to standby mode. ENWW Basic operation 137