Gp 5.14 Paper Transport Assembly - Xerox DocuPrint N2025 Service Manual

GP 5.14 Paper Transport Assembly

BTR Assembly – Figure 1
The Bias Transfer Roll of the BTR Assembly is in contact with the drum in the Print Cartridge.
The BTR is driven by the Drum Gear so that the BTR surface moves at the same speed as the
Drum surface.
The BTR applies a positive charge to the back side of the paper when the paper travels
between the BTR and the drum. The negatively charged toner image transfers from the drum
surface to the front side of the paper because it is attracted by the positive charge on the back
side of the paper.
Paper Transport Assembly (Includes the following components) –
Metal Registration Roll and Rubber Registration Roll: The rotation of these Rolls is controlled
by means of the Registration Clutch so as to register the paper with the image on the drum.
Registration Sensor: Detects the arrival and departure of the paper at and from the registration
position.
BTR Bearing: Applies the toner image transferring voltage supplied from the HVPS to the BTR
Assembly.
Detack Saw: Imparts a negative charge to the back side of the paper to partially neutralize the
positive charge and let the paper peel off the drum.
Zener Diode: Flows the electrostatic charge on the rolls and the paper guiding surfaces around
the BTR to the Frame Assembly, maintaining them at a constant voltage with respect to the
Frame Assembly. By thus grounding through a Zener diode, the disturbance of the toner image
during the transfer is better prevented.
Figure 1 Bias Transfer Roll Assembly
General Procedures / Information Initial Issue
02/2000
GP 5.14
6-68 DocuPrint N2025/N2825