3: Operation
3-86
Colorwriter LSR 2000 Printer
Service Guide
Pick-up motor drive circuit
The pick-up motor is a four-phase stepping motor, located in the
pick-up unit and controlled by the pick-up PCB. This motor drives
the cassette pick-up roller, the manual feeding pick-up roller, the
separation roller, the registration roller, feed rollers 1 and 2, and the
paper lifting plate press cam.
The pick-up motor is controlled by the pick-up motor driver
(IC302) on the pick-up PCB. IC302 sets the pick-up motor drive
signal to “L” to drive the fixing unit motor 0.2 seconds after starting
it. IC302 selects the rotational speed as the normal speed, the initial
speed, or the grip speed.
Figure 3-66
Pick-up motor drive circuit
Note:
The pick-up roller rotates to the initial position at power-on
and door-open/close.
Transfer drum and peripheral components
Using electrostatic force imparted by the attraction roller, the
transfer drum takes paper up onto it by clamping the leading edge
of the paper with the gripper. In full-color mode, four transfers
occur, while in mono-color mode, a single transfer occurs. The
paper is then fed to the fixing unit. As shown in Figure 3-67 on
page 3-87, the transfer drum is surrounded by the attraction roller,
the photosensitive drum, the discharge roller, the cleaning brush,
and the separation claw. These components are controlled by the
mechanical controller.
When the paper temporarily stopped in the position of the paper
top sensor (PS303) resumes being fed, the gripper drive signal
J304-2
-1
-5
-6
-3
-4
+24VC
AO
/AO
BO
/BO
CA
CB
Pick-up motor
12
8
1
11
18
7
6
5
16
17
CPU
8
10
9
11
M1
(IC302)
Pick-up motor
driver
(IC301)
Pick-up PCB
