Xerox 4400DT - Phaser B/W Laser Printer Service Manual page 118

MPT No Paper Sensor
MPT No Paper Sensor Troubleshooting Procedure
Step Actions and Questions
1 1. Enter Service Diagnostics and select Sensor Tests.
2. Scroll to MPT No Paper Sensor test and press OK.
3. Actuate and deactuate the MPT No Paper Sensor.
Does the message on the Front Panel display
alternate between With Paper and Without Paper
as you press and release the actuator?
2 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/J23 pin 14 and frame ground.
Is the voltage +3.3 VDC with the MPT No Paper
Sensor deactuated and 0.0 VDC with the Sensor
actuated?
4 1. Switch the printer power OFF.
2. Remove the Left Front Cover (RRP 1.7 on
page 6-12).
3. Switch the printer power ON.
4. On the Connector PWB, measure the voltage
between P/J45 pin 3 and frame ground.
Is the voltage +3.3 VDC with the MPT No Paper
Sensor deactuated and 0.0 VDC with the Sensor
actuated?
5 Check the voltage between P/J45 pin 1 and frame
ground.
Is the voltage +1.2 VDC?
Phaser 4400 Laser Printer Service Manual
page 6-7), and the
page 6-16).
Yes No
It appears Go to step 2.
that the MPT
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
MPT No
Paper
Sensor
Actuator
(RRP 4.5 on
page
Replace the Go to step 4.
Engine Logic
Board (RRP
9.3 on
page 6-89).
Replace the Go to step 5.
Connector
PWB (RRP
9.7 on
page 6-94).
Replace the Replace the
MPT No Engine Logic
Paper Board (RRP
Sensor 9.3 on
(RRP 4.8, page
page 6-53).
6-50).
6-89).
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