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2) Printing control (PCU)
The CPU and ASIC control printing.
1. Blockdiagram
Main motor
Heater lamp
control circuit
Thermistor
High
voltage
generating
circuit
Solenoid
PUS
The PCU controls the following functions and items:
1
2
Rotation of the main motor (pulse motor)
3
High voltage output
4
Fusing temperature
5
Optical system (polygon motor/ laser APC circuit start)
6
400/600DPI resolution automatic selection
Temperature correction of fusing temperature and high voltage
output
Motor
driver
Driver
Driver
Driver
Driver
CPU
(SH7041)
and
ASIC
(LR38784A)
Fig. 4
5 – 9
FO-2970MU
Laser scanning unit
Laser start
position
sensor
Laser diode
Scanning motor
IEEE1284
Host
I/F Connector
computer
Reset circuit
PIN sensor
POUT sensor
PE sensor
Door switch
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