Anonymous posted an answer for this Canon PIXMA MX340 Wireless Office All-in-One InkJet Printer:
"I had the exact same problem. The Alarm light was always on and the screen said "Document..."
Anonymous posted an answer for this Canon PIXMA MX340 Wireless Office All-in-One InkJet Printer:
"My printer is a Canon Pixma MX340 it is showing a error Document in ADF Press [ok] but..."