Xerox PHASER 8560MFP, Service Documentation

Page: 282 / 296

10/2006
8-10 Phaser 8510/8560MFP Multifunction Product
Image Output Terminal
Initial Issue Theory of Operation
Figure 2 Tray 1 Pick Mechanism
Paper Pick for Trays 2 ~ 4
NOTE: Trays 3 and 4 are optional 525-Sheet Feeders.
To pick a sheet of paper, the media path drive starts the process. The pick clutch engages to
turn the pick roller and the nudger roller. The nudge roller advances one sheet of paper forward
into the pick nip. The retard roller prevents two sheets from advancing. The sheet of paper con-
tinues past the take away rollers until the sheet completes the deskew process. When using
the optional 525-sheet feeder, paper is pre-picked from the tray and staged in the paper path
while the system is printing previous pages.
The deskew process uses a reverse/buckle deskew for all three paper paths. The paper is first
driven against non-rotating rollers. The rollers reverse during simplex, causing a buckle in the
paper. This ensures that the leading edge is straight to prevent skewing. The deskew rollers will
not reverse during duplex printing.
Figure 3 Paper Path Sensors
2-Sided (Duplex) Printing
When duplex printing, the exit rollers pull the paper to a predetermined location. In this posi-
tion, the trailing edge of the paper is adjacent to the exit rollers. The exit rollers then pull the
paper back into the duplex path. From a non-rotating deskew nip, the print continues through
the paper Preheater and transfix system to the exit tray in the same manner as a single-sided
print.