An Error In The Scanner Or A Paper Jam In The Automatic Document Feeder Caused An Error Message; The Sharpness Setting Is "Grayed Out" In The Epson Twain Scanner Control Dialog; The Document Source Setting Is "Grayed Out" In The Epson Twain Scanner Control Dialog; The Preview Button Is "Grayed Out" When The Automatic Document Feeder Is Selected Under Document Source - Epson ES-300C User Manual

When you type a value that exceeds the right edge of the
scanning area, the value is not accepted. Move the selection
rectangle to the left edge and retype the value.
An error in the scanner or a paper jam in the Automatic Document
Feeder caused an error message.
Reset the scanner to clear the error condition, then try scanning
again.
The Sharpness setting is "grayed out" in the Epson TWAIN
Scanner Control dialog.
You are using a scanner that does not support the Sharpness
feature.
The Document Source setting is "grayed out" in the Epson
TWAIN Scanner Control dialog.
This feature requires an optional Automatic Document Feeder
or a Transparency Unit.
The Preview button is "grayed out" when the Automatic
Document Feeder is selected under Document Source.
The preview feature is disabled when the Automatic Document
Feeder is selected because the document would have to be fed
through the feeder for the preview scan and then reinserted
into the feeder for the final scan. If necessary, use the flatbed for
previewing your document.
When you scan Black and White Line Art, Black and White
Halftone, or other monochrome image, the scanned image is
reversed like a negative image.
Some TWAIN-compliant applications incorrectly interpret the
scanner data. Check with your software application publisher
for an updated version of the software.
4-4 Troubleshooting