Circuit Description Of Printer Pwb (Pcu) - Sharp FO-3150 Service Manual

[3] Circuit description of printer PWB (PCU)

The CPU and ASIC control printing.
1) Block diagram
Main motor
Heater lamp
control circuit
Thermistor
High
voltage
generating
circuit
Solenoid
PUS
The PCU controls the following functions and items:
1 Rotation of the main motor (pulse motor)
2 High voltage output
3 Fusing temperature
4 Optical system (polygon motor/ laser APC circuit start)
5 Temperature correction of fusing temperature and high voltage
output
Motor
driver
( PD780032A)
( PD65944)
Driver
Driver
Driver
Driver
8 bit CPU
and
ASIC
Fig. 9
5 – 12
FO-3150U/C
Laser scanning unit
Laser start
position
sensor
Laser diode
Scanning motor
Reset circuit
PIN sensor
POUT sensor
Door switch