Canon printers are renowned for their reliability and print quality. However, like all complex machines, they eventually display frustrating errors—most notably "Waste Ink Pad Full" or "5B00" and "5B01" error codes. When this happens, your printer effectively becomes a brick unless you use specialized software.
Hold the Resume/Stop button (triangle icon), then press and hold Power. Download Canon Service Tool V1074
(depending on the model); the alarm light should toggle each time. Release the Download Canon Service Tool V1074: The Ultimate Guide
Release everything. If successful, the green light stays steady, signaling the printer is ready for commands. The Reset like all complex machines