Canon NP6218 Service Manual page 4

Maintenance and Servicing provides tables of periodically replaced parts
Chapter 9
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,
signal name accompanies the symbol
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.
represents the path of mechanical drive—where a
CANON NP6218 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIMÉ AU JAPON)
, the arrow indicates the direction