Dell Multi-Function Color Laser Printer 3115cn will not scan to PDF in larger than 5pp increments

Dell Multi-Function Color Laser Printer 3115cn will not scan to PDF in larger than 5pp increments. In other words, when I need to scan to PDF in order to e-mail a multi-page document to someone, the printer breaks the document into 5-page parts. If I scan a 13-page doc, the printer e-mails 3 docs in 3 separate e-mails, 1 containing pages 1 thru 5, another with pages 6-10 and another with pages 11 thru 13. I cannot find the software setting to change this to accept the document as-is and send it in ints entirety in a single e-mail.