CHAPTER 3 EXPOSURE SYSTEMCOPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)3-4Figure 3-104J101-1M2PS1 Light-blockingplateScanner home position signal (SCHP)Scanner home position sensor(PS1)J110 -1 SC_COM-2 SC_B*-3 SC_B-4 SC_COM-5 SC_A*-6 SC_AQ109Motor driver circuitDC controller PCBD. Scanner Drive System1. OutlineThe scanner is driven by the scanner/lens drive motor (M2), whose direction of rotationchanges to move the scanner forward or in reverse.When moving the scanner forward, the speed of rotation of the motor varies according to theselected reproduction ratio on a continuous basis; when moving the scanner in reverse, on the otherhand, its speed remains the same regardless of the selected reproduction ratio in normal copying(312mm/sec, about 3.3 as fast as when moving the scanner forward in Direct).The distance over which the scanner is moved varies according to the length of copy paper andthe selected reproduction ratio.The scanner/lens drive motor dives the lens drive system as well as the scanner.
