Lexmark T65x and X65x Mono Product Study Guide Rev 1.47
For Training Purposes Only 6/3/2009
9
Electrophotographic Process
Charge:
The twin charge rollers deposit a uniform negative electrostatic charge on the light-sensitive
surface of the photoconductor drum: (also called the PC, Photodeveloper, or OPC).
Exposure:
The printhead generates Laser light that enters the cartridge and strikes the photoconductor
(PC) drum in areas to be developed, forming an invisible (latent) electrostatic image of the
desired print. Note: Any form of light (laser, LED's, sun light, etc.) activates the
Electrophotographic (EP) properties of the drum coating. Consequently, care should be taken to
cover the PC when removed from the printer to protect it from exposure to a light source.
Development:
(Developer Roll) Toner is transferred from the reservoir in the toner cartridge to the
photoconductor drum through electrostatic attraction making the image visible on the PC drum.
Toner is attracted only to areas where the laser imaged the drum. Since the toner and the charge
applied to the drum are both negative, the toner will be repelled from areas where the laser did
not image the drum.
Transfer:
The transfer roll rolls along the underside of the paper to be imaged, and moves the toned
image from the photoconductor to the paper. The toner is negatively charged and the transfer roll
bathes the paper with a positive charge; this attracts the toner to the paper.
Fusing:
The paper – now with a “toned” image – moves through the fuser assembly. Using temperature
and pressure, it marries toner to paper.
Cleaning:
Waste toner (toner that was not transferred), paper debris and dust are removed from the
photoconductor drum by the cleaning blade.
Print head
Toner
Developer
Transfer roll
PC drum
Twin Charge
roller
Paper path
Laser li
ht
Fuser
Cartridge
Hot roll
Backup roller
The Photoconductor (PC
drum) plays an active role in
every part of the EP process
with the exception of fusing.
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