Unfortunately what you are wanting to do is not possible.
The printer requires that ALL cartridges be present and available for use, even if you are not actively printing in color.
The reason for this is to protect the printer from damage. If you tried to print in black only with a color cartridge empty, those adjacent nozzles would overheat and become permanently damaged. The color ink is necessary also for normal maintenance (cleaning and purging) operations so some gets used regularly even if you aren't actively printing in color.
You will need to replace the color inks to proceed with black.
If you only ever really need black, you may be better off investing in a new printer, a black only model would be much more economical, as a toner cartridge will last for thousands of pages.
A black only all in one laser is around $125: http://amzn.to/2fdn5PG
My apologies for the news.
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