c.  ADF glass 
d.  Scanner glass 
3.  Close the scanner cover.  
If your printer has another ADF glass inside door C, then continue with the following steps.
4.  Open door C. 
5.  Using a damp, soft, lint-free cloth, wipe the following areas:  
a.  ADF glass pad in door C
b.  ADF glass in door C
c.  ADF rollers
If required, replace the ADF maintenance kit.
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C325 Color Multifunction Printer User Guide
Maintenance