Reset Toner on Brother MFC-9340CDW

The original Brother toner cartridges for the Brother MFC-9340CDW printer runs out of toner after a programmed amount of toner usage which is of course useless. This is how to reset the toners so you can continue to print for quite some time:

- Close all warning and error message windows and return to the main menu.

- Open the Fax menu

- Mark the '*' Button with a pencil, or just remember where it is. Do not press it. It will disappear in the next step.

- Return to the main menu.

- Open the printer so you can see the toners. 

- Press and hold the hidden '*' button for 7 seconds.

- A toner reset menu appears. Reset the toner in question.

  - Choose K=black, C=cyan, M=magenta, Y=yellow, STR=starter (small), STD=standard, HC=high capacity.

- Close the printer and return to the main menu.

See also https://www.timoschindler.de/brother-mfc-9140cdn-toner-resetten/