Chapter 10 Troubleshooting provides tables of maintenance/inspection,standards/adjustments, and problem identification (image fault/malfunction).Appendix contains a general timing chart and general circuit diagrams.The following rules apply throughout this Service Manual:1. Each chapter contains sections explaining the purpose of specific functions and therelationship between electrical and mechanical systems with reference to the timingof operation.In the diagrams, represents the path of mechanical drive-where a signal nameaccompanies the symbol →, the arrow indicates the direction of the electric signal.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 from cir-cuit to circuit.) In addition, the asterisk (*) as in “DRMD*” indicates that the DRMD sig-nal goes on when ‘0’.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 practically all cases, the internal mechanisms of a microprocessor cannot bechecked in the field. Therefore, the operations of the microprocessors used in themachines are not discussed: they are explained in terms of from sensors to the inputof the DC 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 prod-uct improvement or other purposes, and major changes will be communicated in theform of Service Information bulletins.All service persons are expected to have a good understanding of the contents of thisService Manual and all relevant Service Information bulletins and be able to identify andisolate faults in the machine.Reference:Reader Unit Service Manual: FY8-13FH-000PS/PCL Board Service Manual: FY8-13FK-000ii COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)Download free service manual at http://printer1.blogspot.com
