Dell A940 printer problem both surrounded by printing and copying using the black tape.?

Cannot print next to the black cartridge. If I try to copy by pressing BLACK button, nought is printed. But, if I copy by pressing the COLOR button, it is printed in black. I tried to Clean the tape but no black lines were printed. However, when I use the Align likelihood, a black line is printed.

Tried two black cartridges and gain the same results.

What might be tried to resolve this?

Answer:
Hi. Sounds close to the signal is not getting to the black cartridge, Usually nearby is a ribbon cable that connects the printer head to the notes source and these can wiggle free over time. I Would GENTLY get hold of the ribbon near the ends and verbs them out just rather and re-seat them. Good Luck!

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