Question about Brother MFC 420CN All-In-One InkJet Printer

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First, wouldn't print black, now won't print magenta- all new cartridges!

I have been using this printer for about 6 months without problems, then it just stopped printing black. I cleaned and test printed about 20 times, then decided to replace a 1/2 empty black cartridge, clean and test print again....nothing. Then I read that all colors needed to be full to print black, so I replaced a nearly empty Magenta. Now, whereas before Magenta was printing fine on test prints, it won't print Magenta either. I have turned it off, unplugged the power and usb for over 2 minutes, etc....still nothing. Please help.

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  • biz2 Sep 25, 2007

    If printhead is clogged, what is the fix?

  • Anonymous Jan 07, 2008

    near empty black



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Unplug machinepowercord. Open printer and take all carts out. Plug in power. Machine demands carts. Put new one in: Replace with original ink carts!. When asked push 1 (yes New cart). If you have used thirdparty carts, there could be a prob due to construticon or ink quality. In case there is no bk after 3x cleaning cycles anymore, the head is clogged: This happens because the filter in front of the nozzels is clogged by pigmented ink. DO USE ONLY DYE INK for all types of brother inkjet machines!!!

Posted on Sep 25, 2007

  • Mix-it-up
    Mix-it-up Sep 25, 2007

    You have to install a new (or 2.hand) printhead.
    see this post for more info:



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The other week I had the black print head clog up, requiring daily nozzle deep cleaning [a normal 'ocassional' maintenance function]. Thought I needed a new Print head, so anything worth a try.
I loaded up an old black cartridge [I load all my own......always have] with Isopropyl Alcohol and ran deep clean on that cartridge a couple of times, then repeat printed [6 times] a page full of the number 8 in about half inch character size, to get the alcohol through the nozzles. then Deep cleaned again 3 times, to wash it through the print head.

I reloaded the normal ink filled cartridge and ran the '8' page again till I got good black output. It has now been working without problem, daily, for over a week. Clearly if it's a Magenta only problem, the cleaning as described above would be a bit different, as the magenta is one of 4 colour cartridges.
My printer does quite a lot of work, and was bought at least a couple of years ago, being used daily for alpha numeric and photo printing work. This was the first difficulty I experienced with it.
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HI. Try holding the reset button for 6 seconds to overide the error. This may dissable the chip so it won't report but will allow you to keep printing. Simply check the ink tanks visually.

Refilling will give the same error too, again dissable the error.

Cheers Bob Monk (ink manufacturer

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