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(4) Remove the Paper Feed Roller Module, holding up the
     Paper Feed Case along the groove of the Feed Cover to  
     pull out the claw of the case.

(5) Open the optional Roller Exchange Kit with Black Sensor
     Rollers (KV-SS024), or Roller Exchange Kit with White 
     Sensor Rollers (KV-SS025), and take out the Paper Feed
     Roller Module.

(6) Install a new Paper Feed Roller Module with its gear to the
     right.

  a. Attach the bearings at both ends of the Paper Feed
      Roller Module into the guide grooves of the
      chassis in the scanner.
  

  b. Insert the claw of the Paper Feed Case along the
      groove of the Feed Cover.
  c. Push up the two Green Levers at both ends of the
      Paper Feed Module to fix its module to the scanner.

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(7) Push up the Green Levers at both ends in the direction of
     the arrow until they click into position.

(8) Close the ADF Door slowly until it clicks into place.

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(1) Turn off the scanner.

(2) Push the ADF Door Release to open the ADF Door.

(3) Remove the Double-feed Prevention Roller (Retard
     Roller) Cover in the direction of the arrow.

(4) Pull up the Double-feed Prevention Roller (Retard Roller)
     Module in the direction of the arrow to remove it.

(5) Take out the Double-feed Prevention Roller (Retard Roller)
     Module in the optional Roller Exchange Kit  with Black Sensor
     Rollers (KV-SS024) or Roller Exchange Kit  with White Sensor
     Rollers (KV-SS025).

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(6) Install a new Double-feed Prevention Roller (Retard Roller)
     Module with the wider groove of its shaft on the left and match
      it to the left side of the metal holder.

(7) Close the Double-feed Prevention Roller (Retard Roller)
      Cover.

(8) Close the ADF Door slowly until it clicks into place.