Canon NP6320 Service Manual page 25

BASIC OPERATION
1. This chapter describes the various functions of the copier, the relationship between
the electrical and mechanical systems, and the timing of operations of the various
components. In outline diagrams, mechanical drive paths are represented by (
and electrical signal paths are indicated by an arrow (
name.
2. The signals in digital circuits are identified as "1" for HIGH and "0" for LOW. The
voltage for LOW is very close to 0V; the voltage for HIGH depends on the circuit. If
a signal name has no bar over it (e.g, PDP), "1" is a "TRUE" signal and will usually
cause 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 of
circuits is explained using block diagrams rather than detailed circuit diagrams.
Descriptions of circuits are divided into the following sections: from the sensors to
the input section of the main PCBs, and from the output section of the main PCBs to
the various loads.
I. BASIC OPERATION .................... 2-1
A. Functions ...............................2-1
B. Outline of Electric Circuitry ... 2-2
C. Inputs to the DC Controller ...2-4
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CHAPTER 2
CANON NP6320 REV.0 DEC. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
) accompanied by a signal
D. DC Controller Outputs ...........2-7
E. Basic Sequence of Operations
(Direct, continuous copying, 2
sheets)................................ 2-10
)