Xerox Phaser 4500 Service Manual page 92

Rear Cover Switch
Tests the circuit (not just a single switch) affected by opening
the Rear Cover. The Print Cartridge must be installed and the Top Cover closed for
this test to be effective. Toggle the switch by opening and closing the Rear Cover.
"Open" or "Closed" indications appear on the front panel.
Duplex Cover Switch Tests the circuit affected by opening the Duplex Unit.
Toggle the switch by opening the Duplex Unit rear Cover.
Stacker Cover Switch Tests the circuit affected by opening the Stacker Rear
Cover.
Paper Tray Size Read Displays the paper size selected by the position of the Paper
End Guide in the Paper Tray. This test only tests the operation of the Paper Size
Switch Assembly. It does not recognize custom paper sizes.
Print Cartridge Switch
Checks for the presence of the Print Cartridge. Toggle the
switch by partially removing the Print Cartridge. Displays "Installed" or "Not
installed"
Toner Sensor
Checks that there is toner in the Print Cartridge. Displays "Toner
Normal" when the Print Cartridge with toner is in place, and displays "Toner Low"
when the Print Cartridge is partially removed or the toner quantity is low.
Registration Sensor Reports the status of the Registration Sensor. Reports
"Without paper" when the actuator is in the resting position, and reports "With paper"
when the actuator is moved by paper in transport.
Exit Sensor (Fuser)
Reports the status of the Exit Sensor in the Fuser. Reports
"Without paper" when the actuator is in the resting position, and reports "With paper"
when the actuator is moved by paper in transport. You can manually toggle the sensor
by opening the exit gate on the Fuser and pushing the actuator near the center of the
Fuser.
Duplex Sensor Reports the status of the Duplex Sensor. Reports "Without paper"
when the actuator is in the resting position, and reports "With paper" when the
actuator is moved by paper in the Duplex Unit. You can manually toggle the sensor by
removing the inner chute (black plastic) and pressing the actuator, which is just right
of center.
Stacker Sensor Reports the status of the Stacker Sensor. Reports "Without paper"
when the actuator is in the resting position, and reports "With paper" when the
actuator is moved by paper in the Stacker. You can manually toggle the sensor by
opening the Stacker Rear Cover and pressing the actuator.
Stacker Full Sensor
Reports the status of the Stack Full Sensor in the Stacker.
Reports "Not Full" when the actuator is in the resting position, and reports "Full"
when the actuator is raised by paper accumulating on the Stacker Output Tray. You
can manually toggle the sensor by lifting the actuator bail at the Stacker exit slot.
Output Tray Full Sensor
Reports the status of the Stack Full Sensor in the
Standard Output Tray. Reports "Not Full" when the actuator is in the resting position,
and reports "Full" when the actuator is raised by paper accumulating on the Standard
Output Tray. You can manually toggle the sensor by lifting the actuator bail at the
Standard Output exit slot.
Error Messages and Codes 3-13