575 CMY CLR1 Err

i have a 575 CMY that is giving me the "CLR1 Err". Where do i start? I have read that it may just be a dirty sensor but am unsure of where that is to clean..

I do realize that it could be a bigger problem than just a little dirt but if a quick spot cleaning is all it takes I'd be really happy!

Any help would be great.
Related