III. PEDESTAL MOTOR CONTROL CIRCUIT
A. Outline
Figure 8-301 shows the circuit that controls the pedestal motor (M1), and the circuit
has the following functions:
q
Turns on and off the pedestal motor
w
Rotates the pedestal motor at a specific speed
The pedestal motor (M1) is a DC motor equipped with a clock pulse generator. When
the motor rotates, clock pulses (MMCLK) corresponding to the revolution of the motor
are generated. The speed control circuit maintains the revolution of the motor by
matching the phase of the frequency of these pulses and that of the frequency of the
reference signal.
Figure 8-301
B. Mechanism
When the pedestal motor drive signal (PEDMD) from the pedestal controller circuit
goes ‘1’, the drive circuit of the motor driver turns on, thereby rotating the pedestal motor
at a specific speed.
While the pedestal motor is rotating at a specific speed, the motor driver PCB sends
the constant speed state signal (LOCK*=1) to the pedestal controller PCB. The signal
goes ‘0’ if the revolution of the motor fluctuates for some reason.
If LOCK*=0, the operation of the machine is stopped, and ‘E901’ is indicated on the
copier’s display.
CHAPTER 8 PAPER DECK PEDESTAL
COPYRIGHT © 1997 CANON INC. CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
8-5
Pedestal
controller
PCB
Speed
control
circuit
Drive
circuit
Drive
current
Clock pulse
generator
Pedestal
motor
MMCLK
Reference signal
Motor driver PCB
Hall IC output
J108
-1 24VB
J109
-1 PEDMD
-2 LOCK*
-3
M1
Содержание NP6330
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