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do you have original black cartridge? how much printed pages had printer? can you check fuse of print head on main board? which error you have in adj program ? I think new firmware not helping you, also CL1,CL2 cleaninig. it sounds like maintenance pump system. can you try ink charge ?
The cartridge is original, but ed. 40,000 pages were printed. The printhead works, but not all nozzles work. There is air in two of the four tubes. Pumping through PrintHelp does not give results.
after cartridge unit you have 2 diafragma pumps and 2 buffers. Nozzle check, do you have 1 and 3 or. 2 and 4 black band ? Your old cartridge had correct nozzle check ?
Air bubbles are visible in tubes 1 and 3. 2 and 4 are empty. The original cartridge worked well. Then it was refueled and the chip was changed. Until the end of the resource worked normally. After the second refueling, I printed about 5000 sheets and began to strip. I think that when refueling the cartridge started the air that got into the system. How to remove it from there is not clear. In the l-series models, you could pump buffers, but how do you do it here?