L-6534VW Operation Guide Various Print Settings C Move the lock lever forward to release the lock, and then pull out the sensor fiber used to detect the printable surface. D Insert the sensor fiber for detecting the reverse printable surface into the sensor amplifier, and then move the lock lever back to lock it in place. Insert by following the instructions on the tag attached to the fiber. E Close the safety cover. F Check that the sensor is connected correctly. Check that the sensor for the reverse printable surface is emitting white light. 215