Xerox 4400DT - Phaser B/W Laser Printer Service Manual page 120

Output Tray Full Sensor Troubleshooting Procedure (cont'd.)
Step Actions and Questions
2 Visually inspect the Output Tray Full Sensor Actuator.
Does the actuator moves 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. Disconnect P/J31 from the Engine Logic Board.
4. Switch the printer power ON.
5. On the Engine Logic Board, measure the voltage
between P31 pin 1 and frame ground.
Is the voltage +3.3 VDC?
4 On the Engine Logic Board, measure the voltage
between P/J28 pin 10 and frame ground.
Is the voltage +3.3 VDC?
5 1. Switch the printer power OFF.
2. Reconnect P/J31 to the Engine Logic Board. Switch
the printer power ON.
3. On the Engine Logic Board, measure the voltage
between P/J31 pin 3 and frame ground.
Is there +3.3 VDC between P/J31 pin 3 and frame
ground when the Output Tray Full Sensor is
deactuated, and 0.0 VDC when actuated?
Stack Height Sensor Checkout
Stack Height Sensor Checkout Procedure
Step Actions and Questions
1 1. Remove the tray from the feeder demonstrating a
problem.
2. Release the sensor from the feeder frame but do not
disconnect the plug from the sensor.
3. Measure the voltage on the pins as listed in the "Stack
Height Sensor Voltages" table.
Does the voltages on the bottom pin match the
voltage listed in the table?
2 Check the wiring harness between the sensor and the
Feeder PWB.
Is the wiring in good condition?
Phaser 4400 Laser Printer Service Manual
page 6-7), and the
page 6-16).
Yes No
Go to step 3. Replace the
Output Tray
Full Actuator
(RRP 6.8 on
page
Go to step 5. Go to step 4.
Replace the Replace the
Engine Logic LVPS (RRP
Board (RRP 9.5 on
9.3 on page
page 6-89).
Replace the Replace the
Engine Logic Output Tray
Board (RRP Full Sensor
9.3 on (RRP 6.6,
page 6-89). page
Yes No
Go to step 3. Go to step 2.
Replace the Replace the
sensor (RRP sensor wiring
3.4 on harness.
page 6-31). (Item 14 in
PL 3.1 on
page
6-76).
6-91).
6-72).
7-10)
3-23