AM-400 (serv.man7). Chapter 3 (Mechanical Description). - Sharp Copying Equipment Service Manual (repair manual). Page 10

AM-400DE

3 – 10

Normal paper is used as print paper. A laser beam is used to expose
on the OPC surface to form latent electrostatic images, which are
developed into visible images (toner images) and are transferred on
paper. The basic operation is composed of the five processes: charg-
ing, exposure, development, transfer, and cleaning.

Main
charger
brush

Separation
electrode

Transfer
charge
roller

Developing roller

Supply roller

Photoconductor
drum (OPC)

Laser Scanning Unit

Laser
beam

DC: +3600V (D6 Cathode)

DC: -950V

AC: -570V <--> -1330V

DC: -500V

DC: +400V

DC: -280V

Paper

Toner

MC

TC

SV

DV

DC: -220V

Heat roller

Pressure roller

Heater lamp

FU-EARTH

Print

print

Cleaning

cleaning

Paper

100MOHM

100V

4.7MOH M 4.7MOHM

Transfer Charger
Roller Voltage

Development
Roller
Voltage

Main Charger
brush Voltage

High Voltage Power Supply Unit

Supply
Roller
Voltage

CONTROL PWB

16bit CPU
IC21

57

56

TCON

MCON

PWMSIN

Constant
voltage
control
circuit

PWM
control
circuit

Logic
circuit

Oscillation
circuit

B51
Transformer

High Voltage PWB Unit

Constant
voltage
control
circuit

Oscillation
circuit

Feedback circuit

Feedback circuit

B1
Transformer

HV(+)
Rectifier
circuit

HV(-)
Rectifier
circuit

HV(-)
Rectifier
circuit

Constant
voltage(+)
circuit

Constant
voltage(-)
circuit

Short
circuit

Short
protection
circuit

SV

DV

MC

TC

110M

Ω

250M

Ω

FU-EARTH

LASER MFP

Transfer Roller

Supply Roller

Developing Roller

Charger Roller

Heat Roller

Pressure Roller

Doctor

OPC DRUM

Separation electrode