Samsung MultiXpress M537x series Service Manual page 324

4. Troubleshooting
ii) Pull the lever and release the pick up Assy.
iii) Push and release the Stacker Assy.
iv) Remove the Guide Pick Up Upper after removing 4 screws.
v) Check if the sensor is assembled correctly. If the sensor is defective, replace it.
7) Check if the simplex scan sensor connector is connected correctly.
8) Close the DSDF unit.
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