Lexmark C750 Service Manual - Page 117

5060-00x Multipurpose feeder (MPF)-no media in MPF A 250 Paper Jam indicates that the MPF tried to feed a sheet of media from the MPF tray. A 250 Paper Jam may occur when there is no paper in the MPF, MPF is selected as the paper source, or the MFP sensor is malfunctioning. If media is in the MFP it may feed normally with no 250 Paper Jam even though the sensor is malfunctioning. Step 1 Action and questions Enter the Diagnostics Menu. Select Input Tray Tests, Sensor Test, and Multipurpose Feeder. Manually actuate the MP sensor by moving the paper flag in the MPF. Does the test pass? 2 Make sure that the MPF sensor cable from the engine board is correctly installed at J70 on the engine board. Is the cable correctly installed? 3 Check the cable connection between the MP sensor cable and the sensor. Is the connection good between the two cables? 4 Disconnect the sensor cable from J70 on the engine board. Measure the following voltages on J70, being careful not to short any adjacent pins in the connector. All voltages are approximate values. Connector pin Voltage J70-1 J70-2 J70-3 J70-4 +5 V dc +5 V dc +5 V dc 0 V dc Yes Replace the MPF assembly. See "Multipurpose feeder (MPF) removal" on page 4-40. Go to step 3 No Go to step 2 Install the cable correctly Go to step 4 Install the cable correctly Go to step 5 Replace the engine board. See "Engine board removal" on page 4-29. Are the voltages correct? 5 Check continuity of the sensor cable that is between the engine board and MPF assembly. Is there continuity? Replace the sensor assembly. Replace the sensor cable assembly. Diagnostic information 2-83