4. Basic Sequence of OperationsThe distance over which the scanner moves is determined by the microprocessorbased on the copy size, reproduction ratio, and copying mode.The microprocessor computes the dimensions of the original when determining thedistance over which the scanner moves forward.Figure 3-302Ratio key ONScanner motor drivesignal (M3ON)Scanner forwardsignal (SCFW)Scanner stop signal(M3BLK)Blanking exposurelampScanner homeposition sensor (PS1)Lens drive motor(M4, M5)Scanner motor (M3)INTR AER SCFW SCRV LSTR STBYScanner originalleading edge 1sensor (PS3)