B. Potential Sensor Assembly1. Removing the Potential Sensor Assembly1) Remove the blank exposure lamp assemblyfrom the copier. (p. 4-63)2) Remove the two mounting screws q, andremove the potential sensor assembly fromthe blank exposure lamp together with the sup-port plate.Figure 4-517You need not adjust the position of thepotential sensor. When replacing the poten-tial sensor, be sure to replace it togetherwith the potential measurement PCB.(Check to make sure that the potential sen-sor and the potential measurement PCBhave the same number.)C. Primary Charging Assembly1. Removing the Primary Charging Assembly1) Open the front doors.2) Slide out the duplexing unit, and remove theprocess cover.3) Loosen the mounting screw q, and slide thecharging assembly stopper w to the left.4) Disconnect the connector e, and pull out theprimary charging assembly r slowly.Figure 4-5184. MECHANICAL SYSTEMCOPYRIGHT © 1996 CANON INC. CANON NP6085 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)4-701Caution:214 3