Filter
Top Products
Phaser 8400/8500/8550/8560 Color Printer Service Manual 2-27
Theory of Operation
Transfixing and Exiting
Transfixing and exiting consists of four major functions:
1. Staging the paper for rendezvous with the image on the drum and transfix
roller nip.
2. Loading the transfix roller and engaging the drum stripper blade
assembly.
3. Stripping the paper from the drum.
4. Exiting the paper from the printer, or exiting the paper for (2-sided) duplex
printing.
Tripping the preheat exit sensor (see previous illustration) sets up a series of
events, which take place on a predetermined schedule. Paper is transported
through the Preheater to thermally prepare it for transfixing. The preheat
sensor detects the paper’s presence, and accurately references the leading
edge of the media with the image on the Drum.
Based on the timing information from the Preheater, the leading edge of the
media is advanced to the transfix nip.
Once the media is stopped in the transfix nip, the Process Drive gears move
to rotate the Transfix Camshaft to bring the Transfix Roller into contact with
the Drum. The Transfix Roller nip applies the load necessary to transfer the
image to the media from the Drum.
At the point where the Transfix Roller loads, but before the Drum begins to
rotate, the Stripper Solenoid engages. The Stripper Solenoid positions the
stripper blade. The solenoid mounts on the Upper Inner Duplex guide and
activates the strip solenoid lever, which in turn rotates the Stripper Carriage
until it hits the transfix ground pins. This action causes the stripper blade to
drop onto the deadband of the Drum.
After the Transfix Roller and the stripper engage, the Drum rotates to advance
the media and transfix the image. The stripper blade catches the leading edge
of the sheet of media and separates it from the Drum. After the leading edge
is beyond the stripper blade, the Stripper Solenoid de-energizes.
When the solenoid is de-energized, the solenoid return spring provides a
force to move the solenoid plunger out of the solenoid coil which rotates the
Stripper Carriage back to its ready position.
Once the entire image is transferred, the Drum stops rotating and the Process
Drive lifts the Transfix Roller. The Media Drive now rotates the Exit Rollers in
the correct direction to pull the media out. However, the Deskew Clutch is de
energized so the deskew rollers are not driven during transfix. The Exit
Rollers deposit the media into the Output Tray, ending the print cycle.