- Open the platen cover or ADF.
 - Remove the scanner right cover. (Scanner Right Cover)
 - Remove the scale [A].
 - Remove the sheet-through exposure glass [A].
 - Remove the rear scale [A].
 Remove the left scale and exposure glass [A].
- The exposure glass and the left scale are attached with double-sided tape.
 
- When installing, please follow the points below:
 - Install the sheet-through exposure glass with the mark [A] at the rear left corner.
 - Set so that the locating hole of the left scale fits over the locating boss of the front/rear frame.