Xerox 4400DT - Phaser B/W Laser Printer Service Manual page 136

Envelope Feed Clutch Troubleshooting Procedure (cont'd.)
Step Actions and Questions
3 Check the voltage between P/J23 Pin 4 and frame
ground.
Is the voltage 0.0 VDC?
4 1. Remove the Envelope Feeder from the Printer.
2. Remove the Bottom Cover (RRP 13.1 on
page 6-157) and the Top Chute (RRP 13.2 on
page 6-158).
3. Disconnect P/J413 from the Envelope Feeder PWB.
4. Measure the resistance between Pins 1 and 2 on the
disconnected plug.
Is the resistance between 170 and 190 ohms?
5 1. Check the Envelope Feed Belts for wear and
contamination.
2. Check for belts slipping.
Are the belts in good condition and not
slipping?
Envelope No Paper Sensor
The printer incorrectly indicates a No Paper condition in the Envelope Feeder, or fails
to indicate a No Paper condition in the Envelope Feeder.
Envelope No Paper Sensor Troubleshooting Procedure
Step Actions and Questions
1 1. Enter Service Diagnostics and select Sensor Tests.
2. Scroll to Envelope No Paper Sensor and press OK.
3. Press and release the Envelope No Paper Sensor
Actuator.
Does the message on the Front Panel display
alternate between Without Paper and With Paper
as you press and release the actuator?
2 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 check the voltage
between P/J23 Pin 4 and the frame ground.
Is the voltage 0.0 VDC?
3 Check the voltage between P/J23 Pin 3 and frame
ground.
Is the voltage +3.3 VDC with the Envelope
Feeder No Paper Sensor de-actuated and 0.0
VDC with the sensor actuated?
Phaser 4400 Laser Printer Service Manual
page 6-7), and the
page 6-16).
Yes No
Replace the Go to
Engine Logic or Reseat
Board (RRP the Envelope
9.3 on Feeder.
page 6-89). page 2-37.
Replace the Replace the
Envelope Envelope
Feeder PWB Feed Clutch
(RRP 13.3 on (RRP 13.12
page 6-159). on
page
Replace the Replace the
Envelope belts as
Feed Clutch necessary.
(RRP 13.12
on
page 6-168).
Yes No
Replace the Go to step 2.
Engine Logic
Board (RRP
9.3 on
page 6-89).
Go to step 3. Go to
or Reseat
the Envelope
Feeder.
page 2-37.
Replace the Go to step 4.
Engine Logic
Board (RRP
9.3 on
page 6-89).
Install
on
6-168).
Install
on
3-39