HP LaserJet 3052 Service Manual - Page 85

Figure 4-1 All-in-one configuration Sequence of operation The microprocessor (CPU) on the ECU controls the operation sequence of the all-in-one. The following events take place during normal all-in-one operation: Sequence of operation, HP LaserJet 3050 all-in-one scanner Table 4-1 HP LaserJet 3050 all-in-one basic sequence of operation Period Purpose WAIT. After the all-in-one is turned on To perform the firmware initialization. until Ready appears on the control-panel display. READY. From the end of the WAIT period until the user initiates action or a fax is received. To keep the all-in-one ready to print, copy, scan, or fax. CALIBRATION. From the time the copy, To compensate for variables in the scan, or fax button is pressed until the scanning system. STAGE period. STAGE. From the end of the CALIBRATION period until the SCAN period. To position the leading edge of the original document at the scanning position. SCAN. From the end of the brief pause To scan one page of the original during the STAGE period until the document. EJECT or following-page STAGE period. EJECT. From the end of the SCAN To clear the last page of the original period until the original document page is document from the scanner. completely ejected from the scanner. Remarks Tests RAM and establishes and communication with the control panel. This occurs before media moves past the scanner. The page feeds partway into the scanner, and then briefly stops. Another STAGE period follows if another page of the original document is present in the ADF. Otherwise, the EJECT period begins. The all-in-one returns to the READY period at the end of the EJECT period. ENWW Basic operation 65