Xerox 4400DT - Phaser B/W Laser Printer Service Manual page 137

Envelope No Paper Sensor Troubleshooting Procedure (cont'd.)
Step Actions and Questions
4 1. Switch the Printer power OFF and remove the
Envelope Feeder.
2. Check for continuity between J418 Pin 4 (Envelope
Connector Assembly) and P/J23 Pin 3 on the Engine
Logic Board.
Is there continuity between the pins?
5 1. Remove the Front Cover (RRP 1.6 on
the Left Front Cover (RRP 1.7 on
2. Check for continuity between P/J41 Pin 5 on the
Connector PWB and P/J23 Pin 3 on the Engine Logic
Board.
Is there continuity between the pins?
6 Check the Connector Harness Assembly for proper
connection and for defective wires.
Is the harness in good condition?
7 Replace the Envelope Feeder PWB (RRP 13.3 on
page 6-159). If the problem persists, replace the
Envelope Feeder No Paper Sensor (RRP 13.10 on
page 6-166).
3-40
page 6-11) and
page 6-12).
Phaser 4400 Laser Printer Service Manual
Yes No
Go to step 7. Go to step 5.
Replace the Go to step 6.
Envelope
Connector
Assembly
(RRP 4.10
on
page 6-56).
Replace the Repair or
Connector replace as
PWB (RRP necessary.
9.7 on
page 6-94).