Lexmark 4227 Service Manual - Page 47
Paper Select lever. Enter the Service Menu, TOF Sensor-Sharp flag, determines TOF - plus
UPC - 734646117104
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Page 47 highlights
4227-300 FRU/Symptom 5 PE Sensor TOF Sensor PSet Sensor Jam Sensor 6 Paper Select Sensor Action The printer has four sensors in the paper path, plus one which detects the position of the Paper Select lever. Enter the Service Menu and perform the sensor tests. • PE Sensor-Rounded flag, detects the presence of paper at the platen. • TOF Sensor-Sharp flag, determines TOF at paper load. • PSet Sensor-Paper set, detects presence of paper in the tractors and looks for end of forms. • Jam Sensor-Senses the holes in the paper and detects paper jams by the lack of paper movement. When the PSet sensor detects EOF, it lets printing continue to the bottom of the form. When the PE sensor detects no paper, it stops print within a few lines. The jam sensor stops printing after about 50 mm of no signal change; for example, if 50 mm of pinfeed is removed from a sheet, the sensor stops printing. Less than 50 mm will probably be ignored. Therefore, the paper motion must have stopped for the equivalent of about 12 printed lines to cause a jam. If either the PE or the PSet sensor detects no paper during print, printing stops at the end of the current page. The Tractor 2 option also has PSet and Jam sensors on the left tractor. Enter the service menu and perform the sensor tests. Replace any failed or damaged sensors. Enter the Service Menu and perform the Sensor Test 2 for "Lever." Move the Paper Select lever to test the sensor. Replace any sensor if failed or damaged. Diagnostic information 2-23