Canon NP6317 Service Manual page 23

BASIC OPERATION
In outline diagrams,
electrical signal paths.
Signals in digital circuits are identified as '1' for High and '0' for Low. The voltage of
signals, however, depends on the circuit.
Nearly all operations of the product are controlled by a microprocessor; the
internal workings of the processor are not relevant to the serviceman's work and,
therefore, are left out of the discussions. By the same token, no repairs are
prescribed for the PCBs at the user's premises; for this reason, PCBs are discussed
by means of block diagrams rather than circuit diagrams.
For the purpose of explanation, discussions are divided into the following: from
sensors to DC controller PCB input ports; from DC controller output ports to loads;
and minor control circuits and functions.
I. BASIC OPERATION ....................2-1
A. Functions ...............................2-1
B. Outline of Electric Circuitry ...2-2
C. Inputs to DC Controller .........2-4
COPYRIGHT © 1999 CANON INC.
CHAPTER 2
represents mechanical drive paths, and
CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
D. DC Controller Outputs ...........2-6
E. Basic Sequence of Operations
(Direct, Continuous Copying
(2 sheets)) .............................2-9
indicates