Service manual

Chapter 2
2-38
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
0011-6414
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.
T-2-8
2.6.2.4 Main Motor Control
0008-1728
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.
Name Functions Type Direction of
rotation
Speed Fault detection
Main motor
(DCM701)
drives the following:
multifeeder pickup roller,
registration roller,
photosensitive drum,
secondary transfer roller,
ITB, feed belt, holding plate,
waste toner feedscrew
DC motor normal 3-speed
control
full speed, 1/
2 speed
yes
Developing
rotary motor
(DCM703)
drives the developing rotary DC motor normal 1-speed
control
yes
Fixing motor
(PM702)
drives the pressure roller,
face-down delivery roller
DC motor normal 3-speed
control
full speed, 1/
2 speed
yes
Shift motor
(PM704)
locks and unlocks the
developing cylinder to and
from the photosensitive
drum; locks and unlocks the
memory tag contact (toner
cartridge) and the machine
contact
stepping
motor
normal/reverse 1-speed
control
no
Toner
cartridge
motor
(PM705)
drives the developing
cylinder, toner stirring plate
stepping
motor
normal 1-speed
control
no
Cooling fan
(FM721)
cools the areas near the fixing
assembly, low-voltage power
supply, high-voltage power
supply, cartridge
DC motor - 1-speed
control
yes
Document feed
motor
(DCM706)
drives the various rollers of
the ADF
stepping
motor
normal 1-speed
control
no
Flatbed motor
(DCM707)
drives the CCD unit stepping
motor
normal/reverse 1-speed
control
no
Reader
Cooling fan
(FM722)
serves as the reader unit
cooling fan
DC motor - 1-speed
control
no