This may help.
10.4.4 Org. Size Detecting Sensor Adj.
Functions • To automatically adjust the original detection distance for the original size sensor.• To display if the original size detection 2 Sensor is mounted.Use • When the sensor is replaced with a new one.• When an optional sensor has been added.• When an erroneous original size detection is made.• When the marketing area setting is changed.AdjustmentInstructionsIf the adjustment has been successfully made, it completes the adjustment procedure.If the adjustment has turned out to be unsuccessful, check the optional original sizesensors for correct installation and change the defective sensor or harness.Setting/Procedure
Place a blank sheet of A3 or 11 × 17 paper on the original glass and lower the originalcover.
Call the Service Mode to the screen.
Touch these keys in this order: [Machine] → [Org. Size Detecting Sensor Adj.].4. Press the Start key.