My Canon TS8300 all of a sudden decided it wanted to print CDs. It kept asking me to remover the page in the document holder and push it in. I went nuts trying to figure out what it was, turns out the document I was trying to print was a PDF and for some reason it sent the printer a command to set up for CDs. I sent a word document to it and that cleared the problem. It even prints the PDFs OK now. Go figure.