Canon 1000 Service Manual page 230

3. OPERATION AND TIMING
b. Controlling the Fixing Motor
The fixing motor is controlled to six different speeds by PLL control.
Figure 3-651 is a block diagram of the fixing motor controller circuit, which has the following functions:
• Turns on and off the fixing motor.
• Switches the speed of the fixing motor.
• Executes constant speed control on the fixing motor.
The fixing motor is turned on and off by the fixing motor fixing signal (M9D*).
The speed of the fixing motor is switched by the standard pulse signal (M9PLS), and the speed is kept at
a specific value by comparing the feedback clock signal (M9CLK) from the fixing motor against the reference
pulse signal.
To switch the speed of the fixing motor (fixing speed), the frequency of the reference pulse signal is
varied.
The DC controller PCB indicates 'E014' on the control panel if an error is found in the fixing motor as
identified by the following signals:
• The speed of rotation of the fixing motor deviates from the specified value, and the PLL lock signal
(M9PLL*) goes '1'.
• The current of the fixing motor is checked as the fixing motor current detection signal (M9CD); it
exceeds the specified value (overcurrent; M9CD is an analog signal).
J2213A
-1
M9CD
-6
M9D*
-3
M9PLS
-5
M9PLL*
DC controller PCB
3-186
COPYRIGHT © 2001 CANON INC.
Current detection
circuit
Motor rotation
Motor drive circuit
speed control
circuit
Fixing motor controller PCB
Figure 3-651
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
Fixing motor
M9
Clock generator
M9CLK