Read Sharp MX-6240N / MX-7040N (serv.man32) Service Manual online
MX-7040N OPERATIONAL DESCRIPTIONS 13 – 32
B. Operational descriptions
This converts the electrostatic latent images on the OPC drum gen-
erated by the laser (writing) unit into visible images with toner.
erated by the laser (writing) unit into visible images with toner.
Toner and carrier in the developing unit are stirred and transported
by the mixing roller.
by the mixing roller.
By mixing and transporting, toner and carrier are negatively
charged due to mechanical friction.
charged due to mechanical friction.
The developing bias voltage (AC component and negative DC
component) is applied to the developing roller.
component) is applied to the developing roller.
Negatively charged toner is attracted to the exposed section on the
OPC drum where the negative potential falls due to the developing
bias.
OPC drum where the negative potential falls due to the developing
bias.
If the OPC drum is not exposed, the negative potential is higher
than the developing bias voltage, and toner is not attracted.
than the developing bias voltage, and toner is not attracted.
(1)
Preliminary mixing system
The preliminary mixing section is extended for rapid mixing of sup-
ply toner with developer and stable toner density.
ply toner with developer and stable toner density.
(2)
Developer refresh system
Developer deterioration suppression technology for the purpose of
charging stability and long-life of developer.
charging stability and long-life of developer.
Waste developer is discharged from the developer exit port little by
little as shown in the figure below to maintain developer fresh.
little as shown in the figure below to maintain developer fresh.
Signal name
Name
Function/Operation
DM_KCMY
Drum motor
Drives the developer and the drum.
DVC_KCMY
Development drive clutch
Clutch for development drive
GB-KCMY
Developing bias
Bias for development
TCS_KCMY
Toner density sensor
Controls the toner density in the developing unit.
No.
Name
Function/Operation
1
Developer roller
Latent electrostatic images on the OPC drum are changed to visible images.
2
Mixing roller
Mixing of developer
3
Toner filter
Prevents dispersing of toner
Preliminary mixing section
Developer exit port
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