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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Re: first, wouldn't print black, now won't print magenta-...

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

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HP Color Laser Jet CP1215: won't print at all since magenta is out. I changed printer to grayscale but just keeps blinking the magenta sing and the traiangle with ! sign next to it

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These printer MIX so that way there is a balance at the final phase. You have to purchase a magenta cartridge to get this working again. Bypassing this will make tis printer suffer and long term damage can cause a economical issue on your end in the long run.
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1. Open the CP1210 Series Toolbox 2. OPEN System Settings 3. Then enable Cartridge Out Override 4. Then click apply
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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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Black blocked by magenta

One ovbious option would be to have a friend print it out.
I assume that is not an option.

Some printers just won't let you print if a single color is out. Yes, stupid. Try printing a blank page. If it fails, there is no other option but to replace the cartridge or print elsewhere.
If the blank page test works, this next option/test is worth a try...
Depending on the app you are using, you can specify the color breakdown of the colors you are using. In your case, it is possible that the text is set to a rich black (4-color) rather than just black.
If that is the case, to test this most quickly, make a new file, and create a new black (black2), set to 100 black, 0% other colors.
Type a wor and set it to print in that color and try to print it.
If that works, apply the same technique to your real document.
Hope it works. I've been stuck in the same situation, and some printers will just not let you print if a single color is out.
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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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Here's what you should do. Remove all ink cartridges. Get some rubbing alcohol, preferrably 91% proof (leaves less moisture) Get a couple normal paper towels. Check each cartridge for dried ink and remove it using an alcohol wetted paper towel. (The deep cleaning procedures aren't always effective.) The gold contacts on each cartridge should be gold when you are done. Use the same procedure on the gold contacts of the ink cartridge housing inside the printer. Take your time, do it well. If that does not fix the problem, then do the following. Switch the black and magenta cartridge. Some printers won't print when you do this, other printers don't know the difference. If your printer is the later, then attempt a print job using a page that has a line of both black and magenta text. If you see a black print, then the problem is your magenta cartridge (despite having installed a new one) If the magenta prints, then you know the magenta cartridge is good. If the magenta prints but the black doesn't, then you have a printer failure. Let me know your results. ZT3000 Beta tester of "0"s and "1's"

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