Xerox Phaser 6128MFP - Imaging Unit

Phaser 6128MFP Service Manual 2-9
Theory of Operation
• Bias Transfer Roller (BTR) – The BTR is a conductive roller that receives
positive voltage from the HVPS. The BTR contacts the rear side of the Belt and
applies the positive voltage to the Belt.
• Transfer Belt – The Transfer Belt is a conductive unit that receives positive
voltage from the BTR. After the negative charged toner image on the Drum
surface is drawn by the positive charge on the belt, it is transferred from the
Drum to the paper. The Transfer Belt feeds the paper toward the direction of
the Fuser.
Imaging Unit
Excess toner is removed from the Drum and the BCR surfaces, while excess charge
is also eliminated from the drum surface.
• Drum Cleaning – The cleaning blade contacts the surface of the drum
collecting the excess toner by scraping off toner.
• Cleaning Roller – The Cleaning Roller contacts the surface of the BCR
collecting the excess toner by scraping off toner.
• Charge Cleaning – When the Drum is charged by the BCR, any excess charge
hinders the Drum surface from being uniformly charged, which may lead to
print quality problems. The the latent charge pattern remaining on the
photoconductive drum is neutralized by the Erase Lamp (LED) to prepare the
drum for the next Exposure cycle.
s6128-009
: Positive Electric Charge
: Negative Electric Charge
: Toner
Erase Lamp (LED Assembly)
Blade
Cleaning Roll
BCR
Drum
Conductor
Photoreceptor