Engine Control System; Outline Of The Electrical Circuitry - Canon LBP-2000 Service Manual

II. ENGINE CONTROL SYSTEM
A. Outline of the Electrical Circuitry
1 . O u t l i n e
The sequence of operation of the Printer is controlled by the CPU found on the DC controller PCB.
When the power switch is turned on and the Printer enters standby state, the CPU generates
signals to drive such loads as laser diodes, motors, and solenoids in response to the print start
command and image data from an external device. The following is a block diagram for the cir-
cuitry:
Video
controller
Heat
discharging fan
Sensor
Heater
Fixing
control circuit
assembly
Low-voltage
AC input
supply
Power supply assembly
Sequence control circuit
+3.3V
+5V
power
+24V
circuit
Figure 2-2-1
DC controller PCB
ASIC
Video interface
control circuit
Image control
circuit
Scanner motor
control circuit
High-voltage
High-voltage
power supply
control circuit
circuit
CPU
Main motor control circuit
Reset IC
CHAPTER 2
Laser driver
BD circuit
Scanner motor
Cartridge
Paper feeder
(option)
Clutch
Solenoid
Sensor
Main motor
2 - 7