Canon Super G3 Fax Board-J1 Service Manual

Canon Super G3 Fax Board-J1 Service Manual Manual pdf 5 page image

COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON SUPER G3 FAX BOARD-J1 REV.0 JUNE 2001INTRODUCTIONiiiThe following rules apply throughout this Service Manual:1. Each chapter contains sections explaining the purpose of specific functions and the re-lationship between electrical and mechanical systems with reference to the timing ofoperation.In the diagrams, represents the path of mechanical drive; where a signal nameaccompanies the symbol , the arrow indicates the direction of the electric sig-nal.The expression “turn on the power” means flipping on the power switch, closing thefront door, and closing the delivery unit door, which results in supplying the machinewith power.2. In the digital circuits, ‘1’ is used to indicate that the voltage level of a given signal is“High,” while ‘0’ is used to indicate “Low.” (The voltage value, however, differs fromcircuit to circuit.) In addition, the asterisk (*) as in “DRMD*” indicates that theDRMD signal goes on when ‘0’.In practically all cases, the internal mechanisms of a microprocessor cannot bechecked in the field. Therefore, the operations of the microprocessors used in the ma-chines are not discussed: they are explained in terms of from sensors to the input of theDC controller PCB and from the output of the DC controller PCB to the loads.The descriptions in this Service Manual are subject to change without notice for productimprovement or other purposes, and major changes will be communicated in the form ofService Information bulletins.All service persons are expected to have a good understanding of the contents of this Ser-vice Manual and all relevant Service Information bulletins and be able to identify and isolatefaults in the machine.