Question about Brother MFC790cw All-In-One InkJet Printer

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I have a Brother MFC 790cw that does not print black all the other colors work, I have updated the driver bought a new ink cartrige and used the the clean option for the black ink. I know it is recieving data, the printer says ink is full and any documentthat needs black doesnt work. the printer recieves data and acts like it printing with the moving the heads. Help would be greatly acceppted

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  • Master
  • 2,909 Answers

Try printing a rest page and if that doesn't print in black ink the printhead is probably blocked.

With some printers the printhead is part of the ink cartridge and such problems tend to disappear when the cartridge is replaced, unless the cartridge is faulty. Other printers use cartridges that are ink and nothing more and those are prone to the printheads drying out and becoming blocked unless they are never allowed to become completely empty of ink and are kept in frequent use.

Cleaning/replacing such a printhead usually needs special tools and experience and in the case of many cheap domestic printers the cost of service far outweighs the cost of replacement.

Posted on Aug 13, 2017

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SOURCE: Brother MFC-665CW

same issue:
http://www.fixya.com/support/t294185-brother_mfc_240c_change_unable_50

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SOURCE: Brother MFC-235C print head removal

there are no instructions that you would understand and once the print head is clogged up, you can noy mannually clean it , it has to be replaced! sounds like you are using generic ink!

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SOURCE: Brother MFC 5840 won't print red. ink is full. printer head clean

If the regular cleaning does not work, you can try the power purge. Perform it by doing the following:

  • Press Menu, 2, 8, 6, 4 quickly (within about 1-2 seconds from the menu-press, all five buttons should been placed, in order).
  • The display and some buttons should start flashing, and it should say "Maintenance".
  • Press 7, 6.
  • It should say "CLEANING ALL", press right arrow key until you get "CLEANING MAGENTA" or similar.
  • Press 3, it should now change to POWER_P or P_PURGE. Press Mono/Black Start.
  • The display should say "Cleaning", when it's done, it will say Maintenance again.
  • Press 99 and you will leave Maintenance mode, you can now try and see if magenta works again.
If it doesn't work, you'd probably need chemicals to clean the ink tubes. But, this power purge should work.

Posted on Jun 05, 2009

KingDWS
  • 1606 Answers

SOURCE: MFC-790CW; will not print the black color..

You probably have a plugged print head or the black ink feed is plugged.
Depending on how bad it is you may find it easier or even cheaper to replace the printer.

If this is a ink caused problem you stand a chance of fixing it if you are patient but you might go through half an ink cartridge to get it working, If it is stubborn it can take 20 or 30 cleaning cycles before you see any black. You can try using household vinegar (dissolves the dried ink) on a qtip or lint free paper towel to try to clean the print head. To do this you remove the ink cartridge and very gently rub the towel with the vinegar on the print head. This might require you to move the print head to one side so you can see the actual print area (where the ink comes out). Keep doing this until the towel starts to come clean ie not as much ink coming off. Then run a few print cycles and if this works your printer will print as good as the first day you had it.

The next stage would require filling a old clean ink cartridge with vinegar and running cleaning cycles. Usually can be pretty messy and you should rethink buying a new printer but will really clean things out.

It is also possible that the print head has picked up clay or paper lint from the paper and this has hardened like a cement. That means replacement.

Posted on Aug 17, 2009

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Greyscale is color not black only.
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1 Answer

I have a Brother MFC-6490. The printer can not print in black. The black cartridge is new. There is no problem with color printing. Thanks for your help.


Hi

Remove the black ink cartrige and rub the print head into a plain paper with rubbing alcohol until ink flows. If not rubbing alcohol, no problem. Just rub the printhead into a plain paper.

Then try to print again. I hope it helps you. Please post comments if you need more help. Regards

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A, Did u use a refilled one or a new one
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If you are using factory new ink or toner cartridges, then please call the manufacturer’s Technical Support for assistance with the warranty on the cartridges
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garetg,

Your issue with the black ink only is because the print head my be dried up. Witch me that the ink cant flow to the "paper" fast enough. So by time to rollers eject the paper, the ink cant print on the paper. I had the same problem with my Kodak EasyShare 5300 All-In-One. So I contacted Kodak and they are sending me a new one. Try doing the same. Contact your manufacture and ask them..... :)

Much Regards,

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