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4.
Electrical
System
The
scanner
motor
is a two-phase
step-
ping
motor
and
controls
the
direction
and
speed
of
rotation
of
the
scanner
motor
by
changing
the
sequence
of
pulses
applied
to
each phase (A, A. B, B) and frequency.
.
Movement
in reverse direction
The pulses
are generated
in reversed
order,
and the motor
is rotated
in reverse.
.
Movement
in forward
direction
The
scanner
motor
driver
generates
pulses
as shown
in Figure 3-l 1. and the motor
ro-
tates
so that
the scanner
is moved
forward.
For REDUCTION,
the
pulses
are generated
at shorter
intervals
and the speed
of rota-
tion is increased.
Figure 3-l 1
Note:
Scanner
Motor
and Prevention
of Over-Heating
COMCl
and COMC2
are used to control
scanner
moves
in reverse
to
prevent
over-
motor
drive
currents
COMA
and
COMB
as
heating
of the motor.
shown
in Table 3-4.
COMA
and
COMB,
further,
are
kept
at
When
the scanner
moves
forward,
currents
about
0 A when
the motor
is at rest to limit
COMA
and COMB
are lower
than
when
the
heating.
(See Figure 3-l 2.)
Figure 3-l 2
Scanner (movement)
Forward
In reverSe
At rest
COMCl
signal
COMC2
signal
COMAICOMB
0
1
0.45
A
0
1
0.8 A
1
About 0 A
Table
3-4
COP'IRICHT 019OE CANON INC.
C,,N9N HP-,010 RN.0 DEC. 1988 PAINTED
IN JAPAN IIMPAIME
AU JAPONI
3-11
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