Xerox 4400DT Service Manual - Page 93

Load Envelope Troubleshooting Procedure (cont'd.) Step Actions and Questions Yes No 3 Check the voltage between P/J23 Pin 3 and frame Replace the Go to step 4. ground. Engine Logic Is the voltage 3.3 VDC with the Envelope Feeder No Paper Sensor de-actuated, and 0.0 VDC with the sensor actuated? Board (RRP 9.3 on page 6-89). 4 1. Switch the Printer power OFF and remove the Replace the Go to step 5. Envelope Feeder. 2. Check for continuity between J418 (Envelope Connector Assembly) and P/J23 Pin 3 on the Engine Logic Board. Envelope Feeder PWB (RRP 13.3 on page 6-159). Is there continuity between the pins? If the problem persists, replace the Envelope Feeder No Paper Sensor (RRP 13.10 on page 6-166). 5 1. Remove the Front Cover (RRP 1.6 on page 6-11) Replace the Check the and the Left Front Cover (RRP 1.7 on page 6-12). 2. Check for continuity between P/J41 Pin 5 on the Connector PWB and P/J23 Pin 3 on the Engine Logic Board. Envelope Connector Assembly (RRP 4.10 on Connector Harness Assembly for proper Is there continuity between the pins? page 6-56). connection and for defective wires. Repair or replace if necessary. If Harness is in good condition, replace the Connector PWB (RRP 9.7 on page 6-94). 2-56 Phaser 4400 Laser Printer Service Manual