Lexmark X644E Service Manual - Page 162

7002-xxx Cover closed sensors service check-flatbed Note: Check for correct installation of the sensor cable before proceeding with this service check. Note: Both the cover closing sensor (A) and the cover closed (B) sensor are located in the ADF assembly. A B FRU 1 Flatbed cover closing and flatbed cover closed sensors 2 Flatbed closed and flatbed closing actuators 3 Flatbed cover closed and closing sensors 4 Flatbed cover closing/ closed sensors cable Action Enter the Diagnostics Menu (turn on MFP while holding 3 and 6), select SCANNER TESTS, and select Sensor Tests. Check for correct operation of the senors by opening and closing the ADF scanner assembly. If incorrect, go to step 2. Check the flatbed actuators for any signs of a broken, damaged, or missing part. Replace either actuator if damaged or missing. Turn the power off, disconnect the cable to CN7, and measure the voltages at CN7 on the card. The voltages should measure as shown in the table below: Paper length sensor-reflective type (normally closed) Connector CN7 (motor driver card) CN7-Pin 1 0 V dc CN7-Pin 2 +5 V dc CN7-Pin 3 +5 V dc CN7-Pin 4 0 V dc CN7-Pin 5 +5 V dc CN7-Pin 6 +5 V dc Note: All voltages are approximate values. If any of the voltages are incorrect, replace the motor driver card. If the voltages are correct, go to step 4. Check continuity of the flatbed cover closing/closed sensor cable. If incorrect, replace the complete ADF assembly. "ADF complete assembly removal" on page 4-15. Note: Whenever the complete ADF assembly is replaced, it is necessary to perform scanner registration. See "Scanner registration" on page 4-4. If correct, replace the failing sensor. 2-124 Service Manual