Controlling The Motors And Fans; Main Motor Control - Canon MF8100 Series Service Manual

Chapter 2
e. Developing rotary motor driver IC (IC103)
It controls the developing rotary motor.
f. Toner cartridge motor driver IC (IC104)
It controls the toner cartridge motor.
g. Fixing motor driver IC (IC106)
It controls the fixing motor.
h. Engaging motor driver IC (IC107)
It controls the engaging motor.
i. Fan motor control circuit
It controls the cooling fan motor.

2.6.2.3 Controlling the Motors and Fans

The machine uses several motors, consisting of 5 DC motors and 4 stepping motors.
Of the DC motors, one is used in the reader system, one for the image formation system, and two for the image formation/paper feed system, with the remaining
one used as a fan motor serving to cool the inside of the machine. As for the stepping motors, 2 are used in the reader system, another 2 are used in the image
formation system.
The machine is designed to deposit toners of different colors on its intermediate transfer belt. It is important that all these deposits fall at exact points, and minute
changes in the speed of motors can well cause displacement of resulting colors. The machine's DC motor used for image formation, for this reason, is controlled to
an extremely high level of accuracy for its rotation speed.
Name
Main motor
(DCM701)
Developing
rotary motor
(DCM703)
Fixing motor
(PM702)
Shift motor
(PM704)
Toner
cartridge
motor
(PM705)
Cooling fan
(FM721)
Document feed
motor
(DCM706)
Flatbed motor
(DCM707)
Reader
Cooling fan
(FM722)

2.6.2.4 Main Motor Control

This control is utilized to drive the main motor (DCM701).
The DCM701, a three-phase, eight-pole DC motor with a built-in drive circuit, drives each roller used for paper feed and image formation.
The DCNT Board drives the motor by controlling the MAIN MOTOR ACCELERATION (/MAIMACC) signal and MAIN MOTOR DECELERATION (/MAIM-
DEC) signal.
The illustration below shows the control circuit of the motor.
2-38
Functions Type
drives the following: DC motor
multifeeder pickup roller,
registration roller,
photosensitive drum,
secondary transfer roller,
ITB, feed belt, holding plate,
waste toner feedscrew
drives the developing rotary DC motor
drives the pressure roller, DC motor
face-down delivery roller
locks and unlocks the stepping
developing cylinder to and motor
from the photosensitive
drum; locks and unlocks the
memory tag contact (toner
cartridge) and the machine
contact
drives the developing stepping
cylinder, toner stirring plate motor
cools the areas near the fixing DC motor
assembly, low-voltage power
supply, high-voltage power
supply, cartridge
drives the various rollers of stepping
the ADF motor
drives the CCD unit stepping
motor
serves as the reader unit DC motor
cooling fan
T-2-8
Direction of Speed
rotation
normal 3-speed
control
full speed, 1/
2 speed
normal 1-speed
control
normal 3-speed
control
full speed, 1/
2 speed
normal/reverse 1-speed
control
normal 1-speed
control
- 1-speed
control
normal 1-speed
control
normal/reverse 1-speed
control
- 1-speed
control
Fault detection
yes
yes
yes
no
no
yes
no
no
no
0011-6414
0008-1728