Creating PDF/A from a scanned document
You may be able to use the scanner’s software to create a PDF/A document directly -check the vendor’s documentation. If not, use one of the methods below.

If the scanner is connected directly to your computer

If you are using Adobe Acrobat, from the File menu select “Create PDF”, “From Scanner”, “Configure Presets”:

Select the correct device, click the checkbox for “Make PDF/A compliant”, and click OK:

To produce the PDF/A document, select “Create PDF”, “From scanner” again, and select the type of document.

If the scanner is not connected to your computer

Scan the document to create a PDF document and convert it to PDF/A. One method is described at Creating PDF documents with Acrobat.