Having had the same problem on my 425cn Brother with the black ink, I'm told that the solution is hot water. I goes something like this: remove cartridge, place in container with hot water for a while, remove allow to dry completely, replace, perform clean cycle and print test page. Apparently it's imperative to dry completely and stand cartridge upright. The warm water thins the ink, and remove (apparently) blockages. I cannot verify that this works, but will try it this weekend and let you know! If the housing that the ink cartridge can be readily removed, take that out and clean in warm water. Again dry very well before returning. Be care full that ink becomes runny and may leak out of cartridge and make a mess - so work carefully.
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please have at least 2 set of black ink cartridge to determine the problem where in print head area or ink cartridge itself. if two black ink cartridge inserted and still same problem you can now focus problem with the print head. change as possible.
Make sure the protective tape covering the new cartridge has been COMPLETELY removed then reinsert. Your printer should tell you that a new cartridge is inserted and ask to print a test page, align etc. Otherwise your cartridge may have a faulty chip which simply wont read. In which case you need to return it and get a replacement.
It sounds like the actual ink sensor has failed. You can check if it has a print head cleaning routine in the software on the computer. Most likely the actual ink sensor has died though, I've seen this many times. Call Brother to confirm, or maybe if it's still under any kind of warranty: 877-276-8437
My guess is that the color cartridge is either defective or not inserted correctly. I have a 6110 and know that inserting a print cartridge is a little tricky. If it isn't completely inserted and the top latch fastened correctly, the cartridge either won't work or produce errors.
Try reseating the color cartridge so it's inserted in exactly the same way as the black cartridge and run a print job again.
Open the following web page and go to Step three to see the instructions for cleaning the electronic contacts on the cartridge and print carriage.
Fix ink cartridge I had same problem. I must have ran the clean cycle more than 30-50 times over a period of days. That never made any difference. I was about to toss the whole thing but figured I would try one more thing. If it didn't work I would be in no worse shape. Here is what I did. Took an almost empty black cartridge and inject a lot of 100% Acetone to dilute ink. Left some black in it since I didn't want to think it was empty. Inserted this cartridge and ran the cleaning a few time. IT WORKED. I used my word processor program and filled a page with large bold font characters and printed a page or two. Each page cleared more nozzles. After doing this cleaning/printing a number of time, I put in the full good cartridge. Ran the cleaning a few time to eject any of the Acetone diluted ink. Ran the printed page a few time to remove more of the diluted ink. Everything seems to work now.
if you have new print head assembly and cartridges, and waited for flow, and the printer is MECHANICALLY sound (not dropped or G-force damaged), then all that is left is improper cartridge installation. You may not have the cartridges fully inserted/, or maybe they are not PROPERLY inserted. Look for a snap when in place (and no wiggle). I suspect this is your problem, because one symptom you mention, ink accumulation INSIDE the head/cartridge cradle, is VERY rare -unless the cartridge is inserted improperly. The cartridges/head assemblies have VERY good seals to prevent leakage. Unless the o-rings/seals are damaged, leakage outside the seal just does not happen at all, normally.
*New head/cartridge installs can take several hours -sometimes even a day in cold weather, for small iP90-like printers to saturate the heads -and print.