Lexmark T620 Service Manual - Page 105

4069-5XX/7XX Tray X Paper Low Message displays when Tray X is full or has adequate paper in the tray. FRU 1 Paper Low Switch Paper Low Switch Cable High Capacity Feeder Input System Board Action Run the sensor diagnostics for tray X (X=the number that represents the high capacity input tray). If the test fails, disconnect the paper low switch cable from J3 on the high capacity system board. Short pins 1 and 2 together while observing the sensor test on the display. If the display does not change, replace the high capacity feeder system board. If the display changes check the continuity of the switch. If incorrect, replace the switch. If correct, replace the switch cable. Tray X empty message displays when there is paper in the high capacity feeder input tray. FRU 1 Paper Out Sensor Flag 2 Paper Out Sensor (On Option System Board) Action Check the paper out sensor flag for correct operation and installation. If correct, replace the high capacity feeder system board. (The paper out sensor is mounted on the high capacity feeder system board). Diagnostic Information 2-77