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COPYRIGHT
©
1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
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The following rules apply throughout this Service Manual:
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 drive—where a
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 results 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 descriptions in this Service Manual are subject to change without notice for
product improvement or other purposes, and major changes will be communicated in
the form of Service Information bulletins.
All service persons are expected to have a good understanding of the contents of this
Service Manual and all relevant Service Information bulletins and be able to identify and
isolate faults in the machine.