Straight Lines In The Image Come Out Jagged; The Image Does Not Look The Same As The Original; A Line Of Dots Is Always Missing From The Scanned Image - Epson Perfection 640U Reference Manual

Straight lines in the image come out jagged.

Make sure the document orientation is perfectly straight on the
document table. Align vertical and horizontal lines with the scales
at the top and side of the document table.
The image does not look the same as the
original.
❏ Try different image setting combinations on your scanner
software.
❏ Your software may not have sufficient color matching and
color management features, or these components may not be
installed correctly. See the documentation that comes with
your software and computer.
❏ If you are importing an image file, make sure the file format
is one your software can read. Also, make sure the image
settings of your software are appropriate for the type of image
you want to scan.
A line of dots is always missing from the scanned
image.
❏ Print head malfunction is indicated when a line is missing on
printouts only. See your printer manual.
❏ Scanner sensor malfunction is indicated when a line is
missing on both screen images and printouts. Contact your
dealer.
Maintenance and Troubleshooting
5-13