Canon Booklet Trimmer-A1 Service Manual page 5

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,
accompanies the symbol
nal.
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 addition, the asterisk (*) as in "DRMD*" indicates that the
DRMD signal goes on when '0'.
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 ma-
chines 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.
COPYRIGHT© 2002 CANON INC.
represents the path of mechanical drive; where a signal name
, the arrow indicates the direction of the electric sig-
2000 CANON BOOKLET TRIMMER-A1 REV.0 FEB. 2002
INTRODUCTION
iii