User manual

95.08.23.11.30
Color LaserWriter 12/600 PS Basics & Theory 1–83
Carousel
Motor Drive
Circuit
The toner carousel motor (M3) is a two-phase stepping motor. The
toner carousel motor is controlled by the toner carousel motor driver
(Q2003) on the mechanical controller. This motor transmits the driving
force to the toner carousel and the toner cartridge press cam.
When the print sequence command is received, the CPU (Q2001) in the
mechanical controller sends the toner carousel motor control signals
(
DEVPHA, /DEVPHA, DEVPHB, /DEVPHB) and the toner carousel motor
rotation rate select signal (
DEVICH) to the drum motor driver (Q2003)
0.2 second after the main motor starts. Based on those signals, Q2003
supplies the drive signal to the toner carousel motor. 24 VC is supplied
for the drive power supply.
When none of the toner cartridges has been installed, exceptional rota-
tional force is required because the carousel’s center of gravity is out of
center. Since the mechanical controller cannot recognize whether all
cartridges are present or not during operation of the toner cartridge
detection function, the CPU reduces the toner carousel rotation rate by
setting the
DEVICH signal to “H” to drive the toner carousel motor at
half-speed.
Mechanical Controller Board
M3
J2016-1
-2
-8
-4
-5
-6
+24VC
DEVPHA
/DEVPHA
DEVPHB
/DEVPHB
DEVICH
+5V
AO
/AO
BO
/BO
COMA
COMB
53
60
59
58
57
Toner
Carousel
Motor
12
8
1
11
18
7
14
6
5
16
17
3
(Q2003)
(Q2001)
CPU
Toner Carousel
Motor Driver