Chapter 9 Maintenance and Servicing provides tables of periodically replaced parts
and consumables/durables and scheduled servicing charts.
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.
In addition to the above chapters, this SERVICE MANUAL contains a set of appendixes consisting of a general timing chart and general circuit diagrams.
A separate document entitled SERVICE HANDBOOK is also available for troubleshooting problems in the copier.
The following rules apply throughout this volume:
1.Each chapter contains sections explaining the purpose of specific functions and the relationship between electrical and mechanical systems with reference to the timing of operation.
In the diagrams, 
represents the path of mechanical
signal name accompanies the symbol 
, the arrow indicates the direction of the electric signal.
The expression “turn on the power” means flipping on the power switch, closing the front door, and closing the delivery unit door, which will result in supplying the machine with 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 from circuit to circuit.)
In practically all cases, the internal mechanisms of a microprocessor cannot be checked in the field. Therefore, the operations of the microprocessors used in the machines are not discussed: they are explained in terms of from sensors to the input of the DC controller PCB and from the output of the DC controller PCB to the loads.
The contents of this manual may be updated from time to time to reflect improvements rendered to the copier; a Service Information bulletin will be issued as necessary to cover major changes.
All service persons are expected to be thoroughly familiar with the information contained in this manual, SERVICE HANDBOOK, and Service Information bulletins, for quick response to the user’s needs.
ii | COPYRIGHT © 1997 CANON INC. | CANON NP6218 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIMÉ AU JAPON) |
