Primary Transfer (Drum --> Belt) - Xerox Phaser 7500 Service Manual

Theory of Operation
Primary Transfer (Drum --> Belt)
2-12
The 1st BTR (First Bias Transfer Roll) is used to transfer the toner image on the
Drum surface onto the belt. The toner images are transferred from the Drums onto
the belt in the order of Y, M, C, K.
• The 1st BTR is a metal roll that is energized with positive DC voltage from the
HVPS. The 1st BTR contacts the underside of the belt, where it generates a
potential through the resistance of the belt, and transfers the positive charges
to the underside of the belt.
The negatively charged toner image on the Drum surface is attracted to the
positive charge on the underside of the belt and gets transferred from the
Drum to the belt.
Belt
HVPS
1st BTR (Y)
1st BTR (M)
1st BTR (C)
1st BTR (K)
s7500-347
Phaser 7500 Printer Service Manual