PIXMA TR7020a How to print with black ink only

[Canonuser1010]

My colored ink is empty and my Black ink is still full, How can Print with the Black ink only?

It shows up on the screen Code 1401

[SamanthaW]

Hi!

To have a better understanding of your issue, please let everyone know the printer model you’re working with along with any other information you think might be helpful for the Community to know.

If this is a time-sensitive matter, please check out your other support options here: https://canon.us/account

Thanks! 

[Canonuser1010]

The model number is TR7020a

It comes up on my computer that I need to buy Ink . And it's shown that the black is still full