Epson 836XL - Manual (Page 87)

Troubleshooting Page 87
Before you install the document guide, locate the following
parts, included in your scanner box.
Installing the Document Guide
1 Insert the guide pin in the left hole above the scanner’s
document table and the adjust pin in the right hole; push
them in securely. Turn the adjust pin so its arrow faces the
guide pin.
clear document guide grid document guide
adjust pin guide pin