Read Sharp MX-M950 / MX-MM1100 (serv.man21) Service Manual online
MX-M1100 PHOTOCONDUCTOR SECTION i – 2
B. Operational descriptions
(1) Charging operation
The screen grid is attached to the main charger unit, and the OPC
drum is charged at a voltage virtually similar to the voltage applied
to the screen grid.
drum is charged at a voltage virtually similar to the voltage applied
to the screen grid.
Main charger grid voltage
(2) Drum surface potential sensor
The front surface potential on the OPC drum is detected after
charging and exposure. The drum surface is detected by potential
sensor to ensure its specified charge level.
The output (DESS) of the drum surface potential sensor is inputted
to the PCU PWB. The main charger grid voltage control signal
(XGBPWM) duty is varied by the PCU PWB so that the OPC drum
surface potential is specified level.
The main charger ON/OFF is controlled by the signal (XMHVREM).
charging and exposure. The drum surface is detected by potential
sensor to ensure its specified charge level.
The output (DESS) of the drum surface potential sensor is inputted
to the PCU PWB. The main charger grid voltage control signal
(XGBPWM) duty is varied by the PCU PWB so that the OPC drum
surface potential is specified level.
The main charger ON/OFF is controlled by the signal (XMHVREM).
(3) Charger wire cleaning operation
The main charger wire is cleaned by the charger wire cleaner at the
specified interval. The charger wire cleaner is reciprocated once for
one cleaning operation.
The cleaning operation can be also executed with Sim. 6-4.
The charger wire cleaner is driven by the charger wire cleaning
motor (MCCM), and the home position of the charger wire cleaner
is detected by the sensor (MCHPS1).
specified interval. The charger wire cleaner is reciprocated once for
one cleaning operation.
The cleaning operation can be also executed with Sim. 6-4.
The charger wire cleaner is driven by the charger wire cleaning
motor (MCCM), and the home position of the charger wire cleaner
is detected by the sensor (MCHPS1).
2. Exposure section
A. Operational descriptions
In this section, laser beams are exposed onto the negatively
charged OPC drum surface to form electrostatic latent images.
When laser beams are exposing the CGL of the OPC drum, posi-
tive and negative electric charges are generated. The positive
charged generated on the CGL are attracted and shifted by nega-
tive electric charges on the OPC drum surface. On the other hand,
negative charges are attracted and shifted by positive charges in
the aluminum layer of the OPC drum.
Therefore, positive and negative charges are counterbalanced
each other on the surface and in the aluminum layer of the OPC
drum, reducing positive and negative charges and lowering the
OPC drum surface potential.
In the section where laser beams are not exposed, negative
charges remain.
Through this operation, electrostatic latent images are formed on
the OPC drum surface.
charged OPC drum surface to form electrostatic latent images.
When laser beams are exposing the CGL of the OPC drum, posi-
tive and negative electric charges are generated. The positive
charged generated on the CGL are attracted and shifted by nega-
tive electric charges on the OPC drum surface. On the other hand,
negative charges are attracted and shifted by positive charges in
the aluminum layer of the OPC drum.
Therefore, positive and negative charges are counterbalanced
each other on the surface and in the aluminum layer of the OPC
drum, reducing positive and negative charges and lowering the
OPC drum surface potential.
In the section where laser beams are not exposed, negative
charges remain.
Through this operation, electrostatic latent images are formed on
the OPC drum surface.
Operation mode
Output voltage
85-sheet machine
95/110-sheet machine
COPY
- 590v
- 610v
PRINTER
- 590v
- 610v
FAX
- 590v
- 610v
MHV
GB
OPC drum
CTL
CGL
Aluminum
layer
CGL
Aluminum
layer
Screen grid
Transfer high
voltage unit
voltage unit
PCU
PWB
PWB
Transfer high voltage unit
MHV
GB
DESS
DESS
Feed back
Feed back
XABPWM/XMHVREM
XABPWM/XMHVREM
DESS
DESS
MCHPS1
MCHPS1
MCCM
MCCM
OPC drum
Laser beam
CTL
CGL
Aluminum
layer
layer
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