Sharp MX-5000N

MX-5001N PHOTOCONDUCTOR SECTION i – 4
2. 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 (writing) 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 volt-
age applied to the screen grid.
2) Laser lights are radiated to the OPC drum surface by the laser
(writing) unit to form latent electrostatic images.
When laser lights are radiated to the OPC drum CGL, negative
and positive charges are generated.
Positive charges generated on the CGL are attracted by the
negative charges on the OPC drum surface. On the other
hand, negative charges are attracted by the positive charges in
the aluminum layer of the OPC drum.
Therefore, positive charges and negative charges are bal-
anced out on the OPC drum and in the aluminum layer, reduc-
ing positive and negative charges to decrease the OPC drum
surface voltage.
Electric charges remain at a position where laser lights are not
radiated.
As a result, latent electrostatic images are formed on the OPC
drum surface.
3) After transfer operation, remaining toner is removed by the
cleaning blade.
Toner removed from the OPC drum surface is transported to
the waste toner section by the waste toner transport screw.
Signal name Name Function/Operation
DM_C C drum motor Drives the C drum.
DM_K BK drum motor Drives the BK drum.
DM_M M drum motor Drives the M drum.
DM_Y Y drum motor Drives the Y drum.
DHPD_C C phase detection Detects the C phase.
DHPD_K BK phase detection Detects the BK phase.
DHPD_M M phase detection Detects the M phase.
DHPD_Y Y phase detection Detects the Y phase.
DL Discharge lamp (Y,M,C,BK) Light is radiated to the discharge lamp to discharge the OPC drum surface.
MC Main charger (Y,M,C,K) The OPC drum surface is charged negatively.
GB Grid (Y,M,C,K) The OPC drum surface potential is controlled.
No. Name Function/Operation
1 OPC drum (Y,M,C,K) Latent electrostatic images are formed.
2 Cleaning blade Cleans and remove residual toner from the OPC drum surface.
1
Aluminum
layer
OPC drum
CTL
CGL
High voltage unit
Main corona unit
Screen grid
Aluminum
layer
OPC drum
OPC drum
CGL
CTL
Laser beams
: Oct. 24 2008
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