Epson 836XL - Manual (Page 51)

Using Optional Equipment Page 51
3 Place your document on the document table and close the
TPU.
4 Scan according to the instructions in Scanner Basics ,
setting your Document Source to Flatbed (TWAIN Pro) or
your Document Type to Reflective (SilverFast).
To remove the reflective document mat, slide it down and
then pull it up and out of the slots on the TPU.