44 4-664-66Disassembly/Assembly > Original Exposure System > Removing the ADF Upper Unit and ADF Lower Unit (L150 EUR/L150 AUS) > ProcedureDisassembly/Assembly > Original Exposure System > Removing the ADF Upper Unit and ADF Lower Unit (L150 EUR/L150 AUS) > Procedure[3][4] [2][1]4) Place the Arm Shaft [1] of the ADF Unit temporarily by inserting it into the groove [A] of theholder.[1][A]F-4-139F-4-140CAUTION:Be careful not to get fingers caught between the arm [1] of the ADF Unit and the UpperCover when assembling.[1]F-4-141NOTE:Be sure to insert the Arm Shaft [1] into the holder groove [A] while holding the ADF Unit,and pull it in the direction of the arrow to install the arm when assembling.[1][A]F-4-142