Canon PC740 Service Manual - Page 47

Motor, Control, Circuit

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OPERATIONS AND TIMING= E. Main Motor Control Circuit 1. Outline Figure 3-107 shows the circuit that con- trols the main motor (M1); the circuit has the following functions: 01 turns on and off the main motor. 0 controls the rotation of the main motor to a specific revolution. The main motor (M1) is a DC motor with a built-in clock pulse generator. When the motor rotates, clock pulse signals (MMCLK) are generated according to the revolution of the motor. The speed control circuit matches the phases of the frequency of these clock pulses and the frequency of the reference signal to control the rotation of the main motor (M1) to a specific revolution. 2. Operation When the main motor drive signal (MMD) from the DC controller circuit goes '1', the drive circuit of the motor driver turns on, thereby rotating the main motor (M1) at a specific revolution. While the main motor is rotating at a specific revolution, the motor driver PCB sends the speed state signal (MLOCK=0) to the DC controller PCB. If, for some reason, fluctuations occur in the rotation of the main motor, the MLOCK signal goes '1'. If MLOCK=1 continues about 1 sec while the main motor drive signal (MMD) is '1', the DC controller identifies an error in the main motor, stops the main motor and, at the same time, indicates `E010' on the display. E IJ2O_15 i4 Composite j ;power supplyi J901 24V -1 l OV -2 1 MD -5 Phase control drive circuit Drive current Clock pulse generator Ml [..4 -6 MLOCK -6 1 Hall IC output MMCLK Reference signal Figure 3-107 Main motor control PCBJ COPYRIGHT © 1994 CANON INC. CANON PC7201740R501770 REV.0 AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPON) 3 - 7

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OPERATIONS
AND
TIMING=
E.
Main
Motor
Control
Circuit
1.
Outline
2.
Operation
Figure
3-107
shows
the
circuit
that
con-
When
the
main
motor
drive
signal
trols
the
main
motor
(M1);
the
circuit
has
the
following
functions:
01
turns
on
and
off
the
main
motor.
0
controls
the
rotation
of
the
main
motor
to
a
specific
revolution.
The
main
motor
(M1)
is
a
DC
motor
with
a
built-in
clock
pulse
generator.
When
the
motor
rotates,
clock
pulse
signals
(MMCLK)
are
generated
according
to
the
revolution
of
the
motor.
The
speed
control
circuit
matches
the
phases
of
the
frequency
of
these
clock
pulses
and
the
frequency
of
the
reference
signal
to
control
the
rotation
of
the
main
motor
(M1)
to
a
specific
revolution.
E
I
J2O5
_
i
4
1
Composite
j
;power
supplyi
J901
24V
-1
l
OV
-2
1
(MMD)
from
the
DC
controller
circuit
goes
'1',
the
drive
circuit
of
the
motor
driver
turns
on,
thereby
rotating
the
main
motor
(M1)
at
a
specific
revolution.
While
the
main
motor
is
rotating
at
a
specific
revolution,
the
motor
driver
PCB
sends
the
speed
state
signal
(MLOCK=0)
to
the
DC
controller
PCB.
If,
for
some
reason,
fluctuations
occur
in
the
rotation
of
the
main
motor,
the
MLOCK
signal
goes
'1'.
If
MLOCK=1
continues
about
1
sec
while
the
main
motor
drive
signal
(MMD)
is
'1',
the
DC
controller
identifies
an
error
in
the
main
motor,
stops
the
main
motor
and,
at
the
same
time,
indicates
`E010'
on
the
display.
MD
-5
[..4
-6
MLOCK
-6
1
Phase
control
drive
circuit
Clock
pulse
generator
Drive
current
Hall
IC
output
Ml
MMCLK
Reference
signal
Figure
3-107
Main
motor
control
PCBJ
COPYRIGHT
©
1994
CANON
INC.
CANON
PC7201740R501770
REV.0
AUG.1994
PRINTED
IN
JAPAN
(IMPRIME
AU
JAPON)
3
-
7