COPYRIGHT © 1999 CANON INC. CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 2BASIC OPERATIONIn outline diagrams, represents mechanical drive paths, and indicateselectrical signal paths.Signals in digital circuits are identified as ‘1’ for High and ‘0’ for Low. The voltage ofsignals, however, depends on the circuit.Nearly all operations of the product are controlled by a microprocessor; theinternal 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 areprescribed for the PCBs at the user’s premises; for this reason, PCBs are discussedby means of block diagrams rather than circuit diagrams.For the purpose of explanation, discussions are divided into the following: fromsensors to DC controller PCB input ports; from DC controller output ports to loads;and minor control circuits and functions.I. BASIC OPERATION ....................2-1A. Functions ...............................2-1B. Outline of Electric Circuitry ...2-2C. Inputs to DC Controller .........2-4D. DC Controller Outputs ...........2-6E. Basic Sequence of Operations(Direct, Continuous Copying(2 sheets)) .............................2-9
