Xerox 4400DT - Phaser B/W Laser Printer Service Manual page 119

Tray 1 No Paper Sensor
Tray 1 No Paper Sensor Troubleshooting Procedure
Step Actions and Questions
1 1. Remove Tray 1.
2. Enter Service Diagnostics and select Sensor Tests.
3. Scroll to Tray 1 Low Paper Sensor and press OK.
4. Actuate and deactuate the Tray 1 No Paper Sensor
Actuator.
Does the message on the Front Panel display
alternate between With Paper and Without Paper
as you press and release the actuator?
2 Visually inspect the Tray 1 No Paper Sensor Actuator.
Does the actuator move freely and is it in good
condition (not broken or damaged)?
3 1. Switch the printer power OFF.
2. Remove the Left Interface Cover (RRP 1.1 on
page 6-6), Left Cover (RRP 1.2 on
Left Plate (RRP 1.11 on
3. Switch the printer power ON.
4. On the Engine Logic Board, measure the voltage
between P/J33 pin 2 and frame ground as you
actuate and deactuate the No Paper Sensor.
Is the voltage 3.3 VDC with the sensor
deactuated, and 0.0 VDC with the sensor
actuated?
4 Check the voltage between P/J33 pin 8 and frame
ground.
Is the voltage 3.3 VDC?
Output Tray Full Sensor
Output Tray Full Sensor Troubleshooting Procedure
Step Actions and Questions
1 1. Enter Service Diagnostics and select Sensor Tests.
2. Scroll to Output Tray Full Sensor test and press OK.
3. Lift and release the Output Tray Full Sensor Actuator
several times.
Does the message on the Front Panel display
alternate between "Full" and "Not Full" as you
lift and release the actuator?
3-22
page 6-7), and the
page 6-16).
Phaser 4400 Laser Printer Service Manual
Yes No
It appears Go to step 2.
that the Tray
1 No Paper
Sensor is
working
correctly. If a
problem
persists,
replace the
Engine Logic
Board (RRP
9.3 on
page 6-89).
Go to step 3. Replace the
Tray 1 No
Paper
Actuator
(RRP 3.3 on
page
Replace the Go to step 4.
Engine Logic
Board (RRP
9.3 on
page 6-89).
Replace the Replace the
Tray 1 Engine Logic
Feeder PWB Board (RRP
(RRP 3.9 on 9.3 on
page 6-37). page
Yes No
Replace the Go to step 2.
Engine Logic
Board (RRP
9.3 on
page 6-89).
6-30).
6-89).