Epson ES-1200C - Manual (Page 52)

The image is faint or out of focus.
Check that the document is placed flush against the document
table.
Check your gamma correction setting. If it is set for printer, the
image looks lighter when displayed on a monitor.
Make the brightness setting darker.
The image is too dark.
Adjust the brightness with your software. Also check the
brightness and contrast values of your display screen.
Straight lines in the image are jagged.
The document may be placed at an angle on the document
table. Align it so that the horizontal and vertical lines are
carefully aligned with the scales on the top and side of the
document table.
Troubleshooting 3-7