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B.
Electrical
Circuitry
The electrical
operations
of the copier
are controlled
by the microprocessor
on the DC controller
PCB. The microprocessor
reads the input
signals
from
the sensors
and operation
keys as instructed
by the
program
stored
in advance,
and sends
output
signals
as necessary
to drive
the
motors,
solenoids,
lamps and other
loads.
Note:
The microprocessor
used by the copier
is equipped
with
a built-in
AD converter
and, therefore,
is ca-
pable of reading
analog
signals
as well as digital
signals.
The signals
bearing
A in Figure 3-2
repre-
sent analog
signals.
The main motor
(Ml)
is a synchronous
motor
that uses the frequency
of the power
supply
as its
reference;
the scanner
motor
(M21, on the other
hand, is a stepping
motor
that
runs on the frequen-
cy of the crystal
oscillator
inside the DC controller.
Since fluctuations
in the frequency
of the power
supply
affects
the rotation
speed of the main motor
(Ml)
but not the scanner
motor,
such fluctua-
tions can lead to expanded
or contracted
images.
Scanner
home
position
Lens home
position
Main
motor
clock
Pick-up
unit paper
detection
p&
Delivery
unit paper
detection
(Photo
I
interrupter)
Delivery
unit
open/
waste toner detection
(thermistor1
,
(solemd)
+-
LA
,
0
ilamp)
I
Pick-up
clutch solenoid
Registration
clutch solenoid
Lens solenoid
Blank shutter salenold
Pre-conditioning
exposure
lamp
Blank exposure
lamp
Fixing
heater
Main motor
Figure 3-2
-.
3-2
COPYAIMIT
Cl966
CANON INC.
CANON HP-IOIO AN.0 DEC. 1988 PRINTED IW JAPAN [IMPRIME AU JAPOII
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