Canon printer: needs attention (KT6 Surbiton)

This has been a very good color inkjet printer/scanner. At the moment it is sending out blank pages. The system says the colour ink has run out but I am not convinced because I can print a "print nozzle check" perfectly. So this is ideal for someone who likes to repair things, or you could buy a set of compatible cartridges for under £10 and test it. It takes a large and small black cartridge too. The small one is brand new.