Xerox Phaser 8400 Service Manual page 43

DM Cam
gear
In print position (0 degrees), the Printhead is forward and resting against the right and
left head-to-drum buttons. The head-to-drum buttons define the space between the jet
stack and the drum. The Process Drive is activated, which drives the drum
maintenance camshaft such that the tilt gear train is engaged. The tilt cam tilts the
Printhead into the print position. The cam is combined with a missing tooth gear that
allows the cam to be inactive in the print position, which frees the Process Drive to
perform other printer operations.
The cam has a latching mechanism to unlatch and latch the missing tooth gear, to
engage the Printhead tilt drive train. The cam's latching mechanism also holds the tilt
gear in place. A leaf spring applies constant pressure to engage the gear when the
latching mechanism is released. The arm of the latching mechanism is inside the
frame, the rest is visible, outside the frame. Arrows located on the latching
mechanism and on the frame indicate when the Printhead is in print position. When
the arrows on the latching mechanism and frame are aligned, it indicates that the
Printhead is in print position, and the tilt gear is disengaged from the Process Drive.
2-14
Printhead restraint
Drum
Tilt gear
Tilt gear
engaged
Phaser 8400 Printer Service Manual
Printhead
s8400-166