HP 3015 Service Manual - Page 91
Table 4-3. HP LaserJet 3015, 3020 and 3030 printer product base basic sequence of, operation - laserjet drum
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ENWW Table 4-2. HP LaserJet 3020 and 3030 basic sequence of operation (continued) Period Purpose Remarks SCAN. For an ADF scan: From the end of the brief pause that follows the STAGE period until the EJECT or following-page STAGE period. For a flatbed scan: From the end of CALIBRATION until the REHOME period. To scan one page of the original document. For an ADF scan: another STAGE period follows this period if another page of the original document is present in the ADF. Otherwise, the EJECT period follows. For a flatbed scan: The REHOME period follows this period. EJECT. (ADF only) From the end of the SCAN period until the original document page is completely ejected from the scanner. To clear the last page of the original document from the scanner. REHOME. From the end of the EJECT period (ADF) or the SCAN period (flatbed) until the Ready message appears on the control-panel display. To return the scanner to the home position. A short back-and-forth sequence occurs as the scanner reaches the home position before the Ready message appears on the control-panel display. Table 4-3. HP LaserJet 3015, 3020 and 3030 printer (product base) basic sequence of operation Period Purpose Remarks WAIT After the product is turned To clear the drum surface of on until the end of the initial potential and to clean the rotation of the main motor. primary charging roller. STBY (Standby) From the end of the WAIT period or the LSTR period until the pickup command is sent from the formatter. Or, from the end of the LSTR period until the product is turned off. To pause until the product is ready to print. Detects whether or not the cartridge is installed. INTR (Initial Rotation Period) After the pickup command has been sent from the formatter until the media reaches the topof-page sensor (PS801). To stabilize the photosensitive drum sensitivity in preparation for printing. Also to clean the primary charging roller. PRINT (Print) From the end of the initial rotation until the primary voltage goes OFF. To form images on the photosensitive drum based on the VIDEO signals (/VDO, VDO) sent from the formatter and to transfer the toner image onto the media. LSTR (Last Rotation Period) After the primary voltage goes OFF until the main motor stops rotating. To deliver the last page. Also to clean the primary charging roller. When the pickup command is sent from the video controller, the printer enters the INTR period immediately after the end of the LSTR period. Basic sequence of operation 73