Sharp FO-2970M Service Manual - Page 45

Printing control PCU

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

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