C1765 NFW error code 093-933 replace black cartridge

My C1765 nfw shows error code 093-933 Replace Black Cartridge although the cartridge is new. I have carefully cleaned the contacts to the cartridge inside the printer, performed a reset to defaults, initialised the NVM - no result.

The printer is 3 1/2 years old, not really a lot of printing performed. I have used Dell cartridges as well as refilled ones.

Could anyone from Dell help please? I have seen a lot of other posts with the same problem (!) and I cannot see that someone suggests a definite error reason and a solution.