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OPERATION AND TIMING
1. This chapter describes ihe printer functions. the relationships between mechanisms and
circuits, and the timing of operations.
( 11[1c 1.
white lines
groups of signals by outline arrows
2. An active-high signal is indicated by "H" or by a signal name without a slash in front of it,
such as "I'SNS".
front of, such as "/SCNON".
A signal that is "H" or has a name without a slash is active at the supply voltage level
[indicating that the signal is being output). and inactive at ground level (indicating that the
signal is not being output).
A signal thal is "L" or has a slash in front of its name is active at ground level, and
inactive at the supply voltage level.
There is a microcomputer in this printer.
microcomputer cannot be checked, an explanation of the operation of the microcomputer
has been left out.
As it is assumed that no repair will he made to customer circuit boards, the explanation
of board circuits is limited to an outline using block diagrams. So there are two types of
circuit explanation: (1) everything from the sensor to the input sections of the major circuit
boards, (2) everything from the output sections of the major circuit boards to the loads.
These are explained with block diagrams according to the function.
BASIC OPERATION . . . . . . . . . . . . . . . . 2-1
I.
II.
LASER/SC%NNER SYSTEM..... 2-7
III. IMfiGE FORMATION SYSTEM. 2-16
N .
PICK-UP/FEED SYSTEM . . . . . . . . 2-27
CHAPTER 2
the ilow of control signals by solid arrows
( I ---:>I.
Au active-low signal Is indicated by "L" or by a signal name with a slash in
Mechanical linkages are indicated by black and
But as the internal operation of the
V.
OVERALL CONTROL SYSTEM . . 2-36
VI.
POWER SUPPLIES.. ................
VII. ENVELOPE FEEDER.. .............
VIII. PAPER FEEDER.. ...................
( ___) 1,
and the flow of
.
I l l .
2-65
2-56
2-60
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