Xerox Phaser 4620 Service Manual page 388

Tray 1 incorporates a single set of guides. When media is placed in Tray 1, the leading edge
strikes the actuator of the No Paper Sensor indicating the presence of paper. As the last sheet
of paper is fed from the tray the actuator blocks the sensor opening indicating No Paper
remains in the tray.
Tray 2
Tray 2 includes guides that manually adjust to the media loaded in the tray. The guides contact
the edges of the media to hold it in position. Media size is determined by the position of the
switches in the Size Switch. The position of the end guide determines the size signal created
by these switches.
Tray components include, Figure 2:
• Separator Roller
The Separator Roller prevents multi-sheet picks from the tray by applying drag to the bot-
tom of each passing sheet.
• End and Side Guides
The End and Side Guides adjust to different media sizes by moving them to contact the
media edges and hold it in position. Size Switch actuators, located on the tray, are set by
the position of the end guide to indicate loaded media size.
• Sector Gear
The sector gear engages the lift gear on the Lift Motor shaft to raise the bottom plate.
• Bottom Plate
The Lift Motor through the lift gear and tray sector gear turn the lift shaft raising the bottom
plate which causes the media to contact the Nudger Roller. This activity is monitored by
the Lift Sensor. The bottom plate also actuates the media level indicator.
Principles of Operation
Major IOT Assemblies
Figure 2 Tray Components
Tray 2 and the optional trays are functionally equivalent in terms of the feeder mechanism that
moves media from the tray into the media path. The Feed Drive Assembly drives the Feed and
Nudger Rollers to pick paper from the tray. A Lift Motor lifts the tray's bottom plate to maintain
media contact with the Nudger Roller.
The media supply and path are monitored by these sensors.
• Level Sensor
The Level Sensor uses an actuator to determine whether media in the tray is lifted to the
feeding position. As the level of media drops, the flag of the actuator enters the Level
Sensor's sensing area, triggering the Lift Motor to raise the bottom plate. The Lift Motor
raises the bottom plate by rotating the Lift Gear which drives the tray's sector gear.
• Take Away Sensor
The Take Away Sensor detects a paper jam in the tray by the paper position and sensor
transition time.
• No Paper Sensor
The No Paper Sensor uses an actuator to determine whether the tray is empty. When the
actuator lowers, the No Paper Sensor signal goes High indicating an empty tray.
5/2011
8-12
Revision - Xerox Internal Use Only
Phaser 4600/4620 Printer Service Manual