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On the Brother MFC series printers it uses remote ink trays as you will know, instead of having print heads directly on the ink cartridge. Whilst this approach makes it cheaper to produce the ink, and easier to change the cartridge, it can make it difficult to clear clogs.
There are several things you can do which may help, but B. and C. are at your own risk. All steps assume you have a new yellow ink cartridge.
A. In paint or another program, create a full page yellow image and keep printing it out. See if it gets any better after each print. If it does, continue until it seems to be working fine.
B. If you can manage to get to the print head, you can get a cue tip, dip it in rubbing alcohol and gently clean the print head. Leave 20 minutes to dry, and then do step A. again.
C. (AS A VERY LAST RESORT AT YOUR OWN RISK. THIS IS GOING TO RUIN YOUR YELLOW INK CARTRIDGE SO USE AN OLD YELLOW ONE IF YOU CAN) If steps A. and B. fail, you can put a "little" rubbing alcohol in the Yellow Ink Cartridge, and keep trying step A. If Yellow starts printing again, swap to a yellow cartridge that does not have rubbing alcohol in it. You are now going to have to cycle through many pages to clear the rubbing alcohol from the ink lines.
Note that if you keep cleaning the cartridges, it is going to use a lot of ink, and may actually hinder solving your yellow ink problem.
It sounds like your yellow is not printing correctly (probably a clogged nozzle). If your printer has separate cartridges, replace the yellow. If you are using aftermarket cartridges, you should try using OEM cartridges since they are spec'd to the printer. If you are usng aftermarket or reloaded cartridges, the ink may not be up to specs. In any case the yellow ink cartridge needs to be replaced. Make sure to run a deep cleaning and alignment after replacing the cartridge.
I have a PIXMA MP 750 and months ago my yellow ink stopped printing. I was only able to use the printer for black and white printing. Every once in awhile I would try multiple deep cleans, new ink cartridges, etc. etc. I talked to the very unhelpful folks at Canon who suggested a new print head ($70), but they couldn't guarantee this would actually work. They really thought it would be best just to buy a new printer.
Although I was feeling bad about adding yet another cheap printer to the landfill I'd pretty much decided to get a new printer. As a last resort I decided to use a suggestion I came across (at pcuser.com) to run hot water through the print head. It was easy to remove the print head (check your manual). I propped the head up in my dish drainer and ran hot water straight from the tap first through the end with the little circular parts and then through the end with the metal strips. I eventually used boiling water from the kettle.
As I poured water through one end I started to see yellow ink coming though the other end so I figured the ink had dried in the head. I kept pouring water through (from both ends) until the water ran clear. I dried the print head, put it back in with the cartridges and VOILA! after MONTHS without yellow ink it's working beautifully again!
If you've tried everything else and feel desperate enough to buy a new printer you might want to try this and report back.
The waistinktank has to be replaced.
DO NOT only reset the code but change the waistinktank!
Otherwise ink will flow into the machine and will cause serious damages!!!!!!!!
See link how to do that:
I had the same problem with the yellow cartridge.
Yellow quit printing, put in a new yellow and
still would not print yellow.
I had a help file, don't know where I got it, but
it suggested replacing the black ink cartridge
also, even though the black wasn't low yet.
Replaced the black, ran a few nozzle cleans and
everything worked fine. Don't know why.