Lexmark T522 Service Manual - Page 89

4520-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. Diagnostic Information 2-61