- Remove the exposure glass. (Exposure Glass)
 - Remove the scanner carriage front cover [A].
 - Move the scanner carriage [A] to the indicated position as shown.
 - Remove the resin cover [A] (Hook x3).
 - Open the metal cover [A].
 - Wipe clean the mirror with a dry cloth. 
 
- When reattaching the metal cover [A], fasten the screws in the order of "1", "2", and "3".
 
- When attaching the resin cover, insert its tip under the metal frame.