Lexmark T520 Service Manual - Page 111
Output Bin Sensor Standard Tray Service Check, enter the Diagnostic Mode, select Output Bin Tests
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4520-xxx Output Bin Sensor Standard Tray Service Check Service Tip: If the output bin standard tray fills up and the bin full sensor fails to post the message "Remove Paper Standard Bin," enter the Diagnostic Mode, select Output Bin Tests, select Sensor Tests and select Standard Bin. Check the sensor and flag for proper operation. If you find no problem with the sensor and flag, continue with the service check. Service Tip: Be sure the flag is correctly installed. The Output Bin Sensor is a normally closed sensor with the sensor flag down. Therefore, unless the flag is in the up position or out of the sensor slot, a Remove Paper Standard Bin message is not displayed. FRU 1 Engine Board Printer fails to display Remove Paper Standard Bin message. Output Bin Sensor Test fails. 2 Output Bin Sensor Flag Action Check the voltage at J6-1. It measures +5 V dc when the flag is in the sensor and 0 V dc when the flag is out of the sensor. If the voltage does not change, replace the sensor cable assembly. If this does not fix the problem, replace the engine board. Check to make sure the correct flag is installed. Check the flag for damage or improper operation. If incorrect, replace the flag. Note: A broken or improper operating sensor flag causes a Remove Paper Standard Bin message to display before POST completes and cannot be cleared. Diagnostic Information 2-83