Hello. Welcome to Just Answer. Please allow me to assist you with your question today. I am John, I will do my very best to help you solve this problem.
It could be that there is yellow ink still inside the black ink receptacle on the printhead. Please try printing -let's say- 10 pages to see if the black ink starts to flow.
If after 10 or 15 pages the black ink doesn't show on paper, please let me know if the ink cartridge is genuine Brother, or is it refilled or generic?
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