COPYRIGHT © 1999 CANON INC. CANON NP6320 REV.0 DEC. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 2BASIC OPERATION1. This chapter describes the various functions of the copier, the relationship betweenthe electrical and mechanical systems, and the timing of operations of the variouscomponents. In outline diagrams, mechanical drive paths are represented by ( )and electrical signal paths are indicated by an arrow ( ) accompanied by a signalname.2. The signals in digital circuits are identified as "1" for HIGH and "0" for LOW. Thevoltage for LOW is very close to 0V; the voltage for HIGH depends on the circuit. Ifa signal name has no bar over it (e.g, PDP), "1" is a "TRUE" signal and will usuallycause an action to occur; a "FALSE" signal will normally prevent the operation.Microprocessors are used in the copier. The internal operations of the microproces-sors cannot be checked by the service person, so no description is given here.Because PCBs are not normally repaired on the customer's premises, operation ofcircuits is explained using block diagrams rather than detailed circuit diagrams.Descriptions of circuits are divided into the following sections: from the sensors tothe input section of the main PCBs, and from the output section of the main PCBs tothe various loads.I. BASIC OPERATION ....................2-1A. Functions ...............................2-1B. Outline of Electric Circuitry ...2-2C. Inputs to the DC Controller ...2-4D. DC Controller Outputs ...........2-7E. Basic Sequence of Operations(Direct, continuous copying, 2sheets)................................ 2-10
