Lexmark Optra T Service Manual - Page 79

4069-XXX Input Sensor Service Check Service Tip: Run the Base Sensor Test. Check the input sensor for proper operation. The display changes from open to closed as the sensor flag is manually moved in and out of the sensor. Service Tip: Run a Diagnostic Print Test in the continuous mode with the controller board removed. A defective input sensor or circuit causes the first copy to exit only partially through the fuser assembly. FRU 1 Input Sensor Flag 2 Engine Board 3 Input Sensor Cable Action Check the input sensor flag for damage and proper operation. If a problem is found, repair as necessary. Check for approximately +5 V dc at J10-10 on the engine board. If incorrect, replace the engine board. Check the continuity of the input sensor cable section of the front wiring harness. If incorrect, replace the harness. If correct, replace the input sensor assembly. Input Tray(s) Option Service Check 250 Sheet and 500 Sheet Trays Service Tip: Try all the other input paper sources to make sure they are properly feeding paper. For 990 Error Code- Service Tray X, X= displays the number of the tray that has a problem or needs service. Diagnostic Information 2-51