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The way the Brother MFC-420CN is designed, it will not print at all if any of the ink tanks are empty. They say that this is to prevent damage to the printheads.
There is no workaround.
A lot of inkjet printers have this same restriction, if any tanks are empty, it will not print.
Yikes! No. That's how they designed it. You always to have all 4 ink because the printer does self-cleaning every so often. Otherwise, the jets dry & clog.
Also, my understanding is that even for black prints, color inks are used in small qty. If ink cost is an issue (it is for a lot of people), you might consider bulk systems.
You said you replaced the cartridges. Were they Genuine Brothers' Cartridges?
My Brother MFC-240C, does not like Generic Printer Cartridges.That sounds like your problem.Also I had with Brother's was problem with Color. Color that should be Yellow, will turn out Green, or Blue Green, etc.The Generic Cartridges, also printed lines thru the words. That's what the Companies do., so they can keep selling the ink cartridges. Some Printers, are able to use Generic, but you have to fill them up yourself and I heard, quite MESSY, or Take them to have them filled.
So I learned, thru trial and error, that you must use the ORIGINAL Genuine Cartridges for the PRINTERS.
This is the only advice I can give you. If you find this helpful, pls rate me.
I'd venture to say that if you haven't used it in a while the ink dried up and clogged the print head. It is probably a job for a service center. Good luck
Yes, you can bypass the color printing. The software you are using for printing can help you change from colour to gray scale or adjust it in the printer properties.
I see it's been a while since you posted your question but in case anyone else is wondering about this, I'll answer. The information is not in the User's Guide booklet but in the Software User's Guide which should be available on your software disk, or you can view it here http://welcome.solutions.brother.com/BSC/Public/files/dlf/doc000240/BH3_UsaEngSoft_C.pdf
Basically, you go to the advanced tab under the printing preferences and select grayscale.
naturally will the printer refuse to print if one color is empty to be in safe mode. This is because of the print head technique which demands a permanent ink supply to prevent drying out:
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