Epson EXPRESSION 1640XL User Manual page 94

The third, and most precise way to use the document guides is
described below. This method also requires tape.
1. Install the pins in the scanner's screw holes through the
document guide's holes. The guide pin screws into the left
hole and the adjust pin screws into the right hole.(See page
4-24)
2. Lay the grid document guide on the document table with the
document guide holes over the screw holes in the scanner.
Make sure the larger document guide hole is on the right
when facing the inside of the cover. (See page 4-24)
3. Open EPSON TWAIN Pro as described in "Starting EPSON
TWAIN Pro" on page 4-6, make the following settings and
click Preview:
Document Source:
Image Type:
Destination:
Resolution:
4-28
Using Your Scanner
Flatbed
8-bit Gray (Std)
LineWork Scan
800 dpi