you can purchase the ink here: http://www.brother-usa.com/accessories/Accessories.aspx?Model=MFC420CN&ACASCID=30 you can download the software for your Brother MFC 420 CN printer here:
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If your using anything other than brother ink it must be very compatible.
Generic ink will dry and clog the ink jets, I suggest you replace with brother cartridges and clean ,clean, clean. If problem exists you'll
have to get a ink syringe, some paper towels to place under the print head. Fill the syringe with hot! water and send just a little through each hole where the ink would go in from the cartridge. Be Very Careful not to inject to much justs enough to loosen the the dried ink and free the the jets. I take no responsibility if you get it wrong. I was able to correct the same problem with mine the same way and never used generic ink again. You can do it! and save on repair bills.
You can save yourself some time and money by doing a Google search for the Brother MFC-420CN installation CD. I am not sure what Operating System you have on your PC/Laptop but if you Google something like: ie.. Installation CD WinXP Brother MFC-420CN - you will get a good amount of responses. Then you can either save the info to your hard drive or burn it to a CD.
Sometimes if you contact the manufacturer and tell them you lost your CD - they will send one out for free.
Both of these options work, but I would go with the download cause if you lose it again the info will be stored and don't forget to backup your downloads for future use..
Hope this helps and please don't forget to rate me.
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.