Zerox 7750 i have refilled the yellow toner cartridge but the low color indicator is still on

The toner container requires resetting.
The Brother limited warranty does not apply to any problem that is caused by the use of third party drum units, toner cartridges, or toner. ... Installing a non-Brother toner cartridge or refilling a toner cartridge will not clear a toner low or toner empty indication on the machine.
Use a Brother cartridge.

Hi,
I suggest if someone is not specialized in refilling ink in an empty cartridge, to get an specialist to the job that they do best to save you time/effort/money.
The cartridge has sensitive pins that the printer detects to determine the amount of ink inside the cartridge; other than this the ink may not have been flowing to the printing mechanism correctly indicating a low level. Try running printer maintenance procedure and replace the cartridge. If the printer indicates a low level, you may need to get a new printer cartridge.
Good luck.

Not yet, check with the supplier and ask if it is compatible with the 7750, if not then exchange the 7760 for a 7750 yellow toner cartridge. Once you open the cartridge the supplier will not exchange.

Toner Blinking yellow LED indicates that the toner cartridge is nearly empty. Buy a new toner cartridge or refill the cartridge. Refilling the TN cartridges is quite simple and you can do it yourself.
It is a very simple process. Please refer to this video.

Let me know if any further clarification/ assistance is required.

Good Luck!
Appreciate generously, if the solution could have been of any help!
CreativeTECH

if you got the seals of of the new cartridge, then sometimes opening and closing the toner door will help the indicator go away. I have 2 of these and sometimes it takes a bit for the toner to work it's way into the system.

Good lunk attempting to follow solution #1, intended for an ink jet printer. LOL!

It seems like you are low on toner for one of the cartridges.

First, try taking out a color toner cartridge, hold it horizontally, and shake end-to-end. This loosens any possible clumps of toner and reactivates static charge between the particles. Repeat this for each color.

Second, print a color page with each toner color separate. For example, a line of cyan text, a line of yellow text, and a line of magenta text. This will help isolate which cartridge has the problem.

Third, check the toner level of each problem cartridge. There is a little clear window on the cartridge you can use for this purpose. Hold the cartridge vertically and tilt slowly toward the side with the window. If you pass a 45 degree angle before the toner appears in the window, it is nearing empty and must be replaced or refilled (yes, refilling is an option). Otherwise, there is likely a different problem, for which I only recommend replacing the cartridge.

Don't forget to empty the waste toner bottle (responsibly, of course). By the time you run low on toner in one of your cartridges, it will likely be nearing capacity.

Look through the menus on the printer for a setting for "Low Toner" -- the choices of what to do are usually either "continue" or "stop" or something similar (my 2430DL has this option setting) -- set this option to "Continue".
My 15 year old HPs also have a similar setting. However, this will keep it printing when the black runs out, so you will need to check your print production run visually as you go along to make sure the quality is what you need

did you shake the toner really well first? sometimes this fixes on this machine.

Most likely the cartridge has its own chip that is not resetable.

Replace Toner with gen cartridge.

 

Or Take cartridge back as faulty after checking that it was opened and installed correctly.

 

Check display on printer for indications that maybe it needs one of the 3 colour toners indicators are Y,C or M

 

K is black