The yellow won't print. It was printing OK but the last two pages in the print run did not have yellow in them. It stopped after about 20 pages. The ink tank was half full. I have done numerous (5) nozzle checks, (4) cleans and a few (3) deep cleans. There is wet ink on the printer cartridge. I have changed the tank to a brand new one, still no yellow. I have also disconnected the machine from the power source for a few minutes, reconnected and turned back on but still no yellow print. What else can I try?

in the print out alone you can already know what print head is no working properly like missing color. if cleaning is not solving the issue this purging the print head. just read the user manual for the instruction

Try HP print and scan doctor

You may have added a separator page,
1). Open printers and Faxed.
2). Right-click your printer and select 'Properties'.
3). Click 'Advanced' tab
4). click 'Separator Page'


Delete any text in the box and click 'OK'

Imaging drum reach 20,000 (black only) or 5,000 (color), replace the image drum.

Supplies life
The life of the imaging drum depends on the number of black-only or color pages that print jobs
require. Imaging-drum life is also affected each time the device calibrates because calibrating causes the imaging drum to rotate. Imaging-drum life is measured in terms of number of rotations rather than number of pages printed.
The type and length of print jobs also affects drum life. A series of short print jobs uses more drum
life than an equivalent number of pages printed in a single large job. To extend drum life, print
multiple copies of a print job at one time rather than sending the same job to the device multiple times.
The life of a print cartridge depends on the amount of toner that print jobs require. When printing text at 5% coverage, black print cartridges last an average of 5,000 pages and cyan, magenta, and
yellow print cartridges last an average of 2,000 pages. High-capacity cyan, magenta, and yellow print cartridges last an average of 4,000 pages. (A typical business letter has 5% coverage.)

here's a solution i came across when dealing with the same problem. apparently the printer expects all of the cartridges to be full and has a sensor to make sure they are even when only printing black. hope this helps!

http://journal.drfaulken.com/trick-your-brother-inkjet-into-working-when-an-ink-cartridge-runs-dry/

((make sure you have the printer turned off)) otherwise you it might print another page if you have multiple prints in the queue you will have to open a file that you are about to print click ok a page will open with a display print queue tab you can see all prints right click on the ones you don't need select cancel
it will be in the print queue where you can stop it printing right click to delete what you are printing you might have to uninstall the printer then reinstall to adjust your print settings

or just go into your printers settings to alter/change the settings

hope this helps

You'll have to run the cleaning mode a few times,
to do so you'll have to get into Maintenance Mode.

To do this:
Press MENU then * then 2 then 8 then 6 then 4
This takes some practice and you have to press them all within a few seconds.
If the machine doesn't say MAINTENANCE when you do it press STOP/EXIT and try again.

When in Maintenance Mode:
Press 7 then 6, then press 3, then press BLACK START
It will say Cleaning - this will take some time when it's done it will go back to MAINTENANCE

After it's completed try 0 then 9, this will print out a small Print Quality test page
it should have several rows of each color (Cyan, Magenta, Yellow and Black)
if they still don't look right then run the cleaning mode again and then print another quality page.

Continue to do this until the quality is back to normal,
when you're done to exit maintenance mode press 9 then 9 to return to normal operation.

note: this cleaning mode uses up a fair amount of ink, use sparingly

note: maintenance mode is for brother technicians and has some codes that can damage your machine, only use the codes I've explained in this solution

((make sure you have the printer turned off)) otherwise you it might print another page if you have multiple prints in the queue you will have to open a file that you are about to print click ok a page will open with a display print queue tab you can see all prints right click on the ones you don't need select cancel hope this helps

It may be that you have extra yellow toner floating around in your printer so take all the toners out and hoover out your printer. Then print out about 10 - 20 blank pages to remove any left over toner. This should solve the problem, if not then its more than likely a faulty toner.

This is a simple 3 step fix

a) Get rid of printer
b) Get rid of husband
c) Get new printer

Hope this works!! :-)