Technical information

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CHAPTER 2
OPERATIONS AND TIli/lING
In outline diagrams,-+represents mechanical drive paths, and = indicates electrical signa1
paths.
Signals in digital circuits are identified as ‘1’ for High and ‘0’ for Low. The voltage of signals,
however, depends on the circuít.
Nearly all operations of the copíer are controlled by microprocessors; the interna1 workings of
these processors are not relevant to the serviceman’s work and, therefore, 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
controllerPCBinputports;from DCcontrolleroutputportstoloads;andminorcontrolcírcuitsand
functions.
1. BASIC CONSTRUCTIONS . . . . . .._._
2-1 P
UIPYAICHT 0 1992 CANON ING.
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