4–50 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)MECHANICAL SYSTEMB. Composite Power SupplyPCB1. Removing the Composite Power Sup-ply PCB1) Remove the lower rear cover and the left cover.2) Disconnect all connectors of the compositepower supply PCB.3) Disconnect J317 and J322 q of the DC control-ler PCB.Figure 4-8014) Disconnect the two AC connectors w, andremove the two screws e.Figure 4-802VIII. ELECTRICALA. DC Controller PCB1. Removing the DC Controller PCB1) Remove the lower rear cover.2) Disconnect the connector from the DC controller.3) Remove the six screws, and remove the DCcontroller PCB from the mounting plate.2. Points to Note When Replacing theDC Controller• When sending the DC controller PCB to theworkshop or the factory, put it in a static conduc-tive bag. Use a static conductive bag whose thatis transparent enough in order for the face of theDC controller PCB to be visible.After replacement, perform the following:q enter the settings recorded on the servicemode labelw adjust the multifeeder paper width sensore adjust the scanning lamp light intensityr adjust AEt enter the values recorded on the compositepower supply label132
