Unclogging pk and mk with piezo flush

The mk and pk on my SC P600 are clogged. If I install new carts with piezo flush I could run the ink exchange and clear out clog?

really depends on the history of the plug. If this is a printer left to sit unused for more than a year, then you would probably need replace the entire ink selector unit. Both of these inks use the same ink channel in the print head and are switched inside the ink selector unit. Was it working a week ago and just suddenly stopped? That could be a blockage in the print head.

Have you been using both black inks regularly? Did you switch to the other black after a very long time (many months) and then nothing worked? These are associated with the ink selector unit…

Let me know the history and I will try and help you.