Fixing Check Ink 1682 and 1684 Canon Pixma Error Codes
Fix the Error Codes 860 and 6004 on Canon Printer – Tech Blogs
canon ts9120 support code 6004 - Canon Community
Blog Soft Web – Medium
Canon UK and Ireland on Twitter: "@Ravenblade86 Thanks Paul, Error 6004 is displayed when there's a service issue. If you've double checked around the printer there's not any of the orange tape /
Manual Canon PIXMA TS8051 (page 457 of 497) (English)