Sharp MX-6500N / MX-7500N (serv.man27) Service Manual ▷ View online
MX-7500N OPERATIONAL DESCRIPTIONS 13 – 29
B. Electrical and mechanical relation diagram 2
Signal name
Name
Function/Operation
CCHPD_KCMY
Charger cleaner home position sensor (K, C, M, Y)
Detects the charger cleaner home position. (CCHP_KCMY)
CCMD_KCMY
Charger cleaner shift sensor (K, C, M, Y)
Detects and controls shift of the charger cleaner.
DEDK(C,M,Y)_L
Drum encoder sensor R (KCMY)
Detects the irregular rotation of drum shaft.
DEDK(C,M,Y)_R
Drum encoder sensor L (KCMY)
Detects the irregular rotation of drum shaft.
DHPD_KCMY
OPC drum rotation sensor (K, C, M, Y)
Detects rotation and the phase of the OPC drum.
DL
Discharge lamp
Discharges the OPC drum surface.
DL2
After-transfer discharge lamp
Discharges the OPC drum surface immediately after transfer.
DM_KCMY
Drum motor
Drives the cyan OPC drum.
GB
Grid bias
The OPC drum surface potential is controlled.
MC
Main charger
The OPC drum surface is charged negatively.
No.
Name
Function/Operation
1
OPC drum
Latent electrostatic images are formed.
2
Cleaning blade
Cleans and remove residual toner from the OPC drum surface.
3
Waste toner transport screw
Transports remaining toner in the OPC drum unit to the waste toner collection section.
4
Discharge lamp
Reduces the surface potential of the OPC drum.
5
After-transfer discharge lamp
Reduces the surface potential of the OPC drum immediately after transfer.
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MX-7500N OPERATIONAL DESCRIPTIONS 13 – 30
C. Operational descriptions
(1)
Operational description of the process unit
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.
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.
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.
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.
(writing) unit to form latent electrostatic images.
When laser lights are radiated to the OPC drum CGL, negative
and positive charges are generated.
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.
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.
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.
radiated.
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
cleaning blade.
cleaning blade.
Toner removed from the OPC drum surface is transported to
the waste toner section by the waste toner transport screw.
the waste toner section by the waste toner transport 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.
light is 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.
CGL, positive and negative 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.
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 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.
the OPC drum surface and in the aluminum layer, reducing
positive and negative charged to decrease the surface voltage
of the OPC drum.
(2)
Improvement of color registration shift
To improve of color registration shift, the irregular rotation of the
drum shaft is detected directly by drum encoder and the detected
irregular rotation is corrected automatically.
drum shaft is detected directly by drum encoder and the detected
irregular rotation is corrected automatically.
Aluminum
layer
OPC drum
CTL
CGL
High voltage unit
Main corona unit
Screen grid
Aluminum
layer
layer
OPC drum
OPC drum
CGL
CTL
CTL
Laser beams
CGL
CGL
Aluminum
layer
layer
Aluminum
layer
layer
CTL
CTL
Lens
MX-7500N OPERATIONAL DESCRIPTIONS 13 – 31
8. Toner supply section
A. Electrical and mechanical relation diagram
(1)
Toner supply section
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MX-7500N OPERATIONAL DESCRIPTIONS 13 – 32
B. Operational descriptions
(1)
Outline
Adoption of the rotating toner bottle enables large capacity with a compact toner cartridge size.
When the remaining toner detection sensor in the toner hopper unit detects no toner, the toner bottle turns to supply toner to the toner hopper.
After supplying, full or empty status is detected at the toner hopper inside. Therefore even if the toner cartridge becomes empty, copying is not
immediately suspended because toner inside the toner hopper is used.
immediately suspended because toner inside the toner hopper is used.
Signal name
Name
Function/Operation
TBFM
Toner bottle fan motor
Cools the surrounding of the toner bottle.
TFSD_KCMY
Toner remaining quantity sensor
Detects the remaining toner quantity.
TNHM_KCMY
Hopper motor
Transports toner.
TNM_KCMY
Toner motor
Transports toner from the toner bottle to the toner hopper unit.
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