User manual

95.08.23.11.30
Color LaserWriter 12/600 PS Basics & Theory 1–99
Pickup Motor
Drive Circuit
The pickup motor is a two-phase stepping motor located in the pickup
block. This motor drives the cassette pickup roller, the manual feed
pickup roller, the separation roller, the registration roller, feed rollers 1
and 2, and the paper lifting plate press cam.
The pickup motor is controlled by the pickup motor driver (IC302) on
the cassette pickup board. IC302 sets the pickup motor drive signal to
“L” to drive the main motor 0.2 second after starting it. IC302 selects
the rotational speed as the normal speed, the initial speed, or the grip
speed. Grip speed is one-third of normal speed.
Note: The pickup roller rotates to the initial position upon power-on
and door-open/close.
J304-2
-1
-5
-6
-3
-4
+24VC
AO
/AO
BO
/BO
CA
CB
Pickup
Motor
12
8
1
11
18
7
6
5
16
17
CPU
8
10
9
11
M1
(IC302)
Pickup Motor
Driver
(IC301)
Cassette Pickup Board