Controlling The Belt Motor - Canon FY8-13FW-000DADF-A1 Service Manual

J. Controlling the Belt Motor
1. Outline
Figure 2-268 is an outline diagram of the belt motor control circuit.
The belt motor is a DC motor.
The microprocessor (Q1) on the DADF controller PCB sends the belt motor drive signal
(BMON), belt motor rotation direction signal (BDIR), and belt motor rotation speed control signal
(BMPWM) to the drive circuit.
When the belt motor starts to rotate, the belt motor clock sensor (S10) sends the belt motor clock
signal (BCLK1) to the microprocessor (Q1). In response, the microprocessor (Q1) compares the belt
motor clock signal (BCLK1) against the rotation speed stored in memory to vary the belt motor
rotation speed control signal (PMPWM) to make a match, causing the belt motor (M3) to rotate at a
specific speed at all times.
Q1
CPU
COPYRIGHT © 1998 CANON INC.
DADF controller PCB
BMON
Drive
circuit
BDIR
BMPWM
BCLK1
Figure 2-268
CANON DADF-A1 REV.0 DEC. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 2 BASIC OPERATION
Belt motor
J7-1
M3
J7-2
S10
Belt motor
clock sensor
J9-B4
2-45