I have bought a used C2660DN from an individual a while ago. I didn't have tried to print photo since I've bought it, and the only test i made seems to be OK.
But today, I have tried to print a photo, but I thought magenta was missing. In fact, when printing a CUPS printer test page, I see that magenta is pale, and red is orange as you can see (the photo is almost the same colors when I compare my phone and the paper. The source file is here https://zsory-furdo.hu, I used this on Windows, as when booting Linux, I can only print B&W, but this is another problem :D)
I already have checked maintainance menus, used auto color adjustment, and manual one