Read Sharp AR-M700 (serv.man19) Service Manual online
AR-M550/M620/M700 DETAILS OF EACH SECTION 6 - 75
C. Operational descriptions
The OPC drum surface is negatively charged by the main charger. The
laser beam images are radiated to the OPC drum surface by the laser
unit to form latent electrostatic images.
laser beam images are radiated to the OPC drum surface by the laser
unit to form latent electrostatic images.
1) The OPC drum surface is negatively charged by the main charger.
The main charger grid is provided with the screen grid. The OPC
drum is charged at a voltage virtually same as the voltage applied
to the screen grid.
drum is charged at a voltage virtually same as the voltage applied
to the screen grid.
2) LED lights are radiated to the OPC drum surface by the laser unit
to form latent electrostatic images.
When LED lights are radiated to the OPC drum CGL, negative and
positive charges are generated.
positive charges are generated.
Positive charges generated in CGL are attracted to the negative
charges on the OPC drum surface. On the other hand, negative
charges are attracted to the positive charges in the OPC drum alu-
minum layer.
charges on the OPC drum surface. On the other hand, negative
charges are attracted to the positive charges in the OPC drum alu-
minum layer.
Therefore, positive charges and negative charges are balanced
out on the OPC drum and in the aluminum layer, reducing positive
and negative charges to decrease the OPC drum surface voltage.
out on the OPC drum and in the aluminum layer, reducing positive
and negative charges to decrease the OPC drum surface voltage.
Electric charges remain at a position where LED lights are not radi-
ated.
ated.
As a result, latent electrostatic images are formed on the OPC
drum surface.
drum surface.
3) After transfer operation, remaining toner is removed by the clean-
ing blade.
Toner removed from the OPC drum surface is transported to the
waste toner section in the toner cartridge by the waste toner trans-
port screw.
waste toner section in the toner cartridge by the waste toner trans-
port screw.
4) The whole surface of the OPC drum is discharged.
By radiating the discharge lamp light to the discharge lens, light is
radiated through the lens to the OPC drum surface.
radiated through the lens to the OPC drum surface.
When the discharge lamp light is radiated to the OPC drum CGL,
positive and negative charges are generated.
positive and negative charges are generated.
Positive charges generated in CGL are attracted to the negative
charges on the OPC drum surface. On the other hand, negative
charges are attracted to positive charges in the aluminum layer of
the OPC drum.
charges on the OPC drum surface. On the other hand, negative
charges are attracted to positive charges in the aluminum layer of
the OPC drum.
Therefore, positive and negative charges are balanced out on the
OPC drum surface and in the aluminum layer, reducing positive
and negative charged to decrease the surface voltage of the OPC
drum.
OPC drum surface and in the aluminum layer, reducing positive
and negative charged to decrease the surface voltage of the OPC
drum.
Aluminum
layer
OPC drum
CTL
CGL
High voltage unit
Main corona unit
Screen grid
OPC drum
LED lights
Aluminum
layer
OPC drum
CGL
CTL
Drum
Lamp
CLT
CGL
Auminum
layer
Auminum
layer
CLT
CGL
Drum
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