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Just do a manual reset:-
Open the front cover of the printer
Press and release the "clear" key
Press "start", then press the up arrow until you see the number 12 on the display
Press "ok", you will see "accepted" on the display
Close the front cover, your toner cartridge should now work.
Original Brother tonor cartidges should reset automatically.
There could be a number of causes for the problems your describing, but one of the most common causes of discoloration and issues with toner is a faulty ribbon sensor. A broken sensor will be unable to accurately read the ribbon and apply the correct color. I hope this helps
The Brother HL 2040 laser printer has a toner cartridge that supplies toner to the drum assembly so that the printer can print properly. When the LED on the front of the printer indicates you are low on toner, you will need to replace the toner cartridge to maintain good print quality. Fortunately, the toner cartridge can be replaced without any special tools.
Instructions Things You'll Need:
* Replacement toner cartridge (part number TN350 or TN360) * Paper towel or scrap paper
Grasp the front cover of the printer and pull it toward you to open the toner door. Reach into the printer and grab the combined toner cartridge/drum assembly. Lift up slightly and pull it out of the front of the printer.
Place the cartridge and drum on a paper towel, spare sheet of paper, rag or other surface that can get dirty. Loose toner particles may spill from the cartridge.
Press the blue locking lever on the cartridge/drum unit to unlock the toner cartridge from the drum. Lift the toner cartridge up and away from the drum unit. Dispose of the old toner cartridge in accordance with your local regulations. Seal it in a plastic bag to keep loose toner from spilling.
Gently shake your new toner cartridge back and forth a few times to distribute the toner evenly across the width of the cartridge. Remove the plastic protective cover from the bottom of the cartridge.
Place the new toner cartridge onto the drum unit and press it down gently until it locks into place. The blue locking lever will automatically click into place. Verify that the toner cartridge is securely connected to the drum.
Locate the corona wire cleaner tab at the front of the drum unit. Slide it back and forth several times to improve the print quality of the drum. Set the tab back in the home position when finished.
Slide the combined toner cartridge/drum unit back into the printer and close the front cover.
There's a window on each end of the cartridges and light shines thru to show when they're empty, your refill toner may not be the right density. If you put a small piece of electrical tape over the windows on the cartridge, the error will go away, but you have to watch print quality to change or add toner.
When all lights flash it's a service problem. You press and hold the go button and see what lights are on then.error light means main PCB failure, Toner light means fuser failure, drum light means laser failure. Toner and error light means main motor error, drum plus error light means its a fan failure.
I had the same problem and found that one of the toner cartridges must have not been seated properly. I removed the black toner cartridge and re-fitted it. The printer now works fine again with no errors. 17H is a code relating to a fault in the rotation ......... possibly one or more toner cartridges need checking. Use the menu on the printer to turn it to the appropriate position (i.e. engine menu then select replacement of whichever toner you are checking).
Hope this fixes your as well.
A couple of suggestions. 1. make sure there is not any plastic shipping tabs that need to be removed from the cartridge. 2. try reseating the cartridge. 3. Try replacing that cyan cartridge. It may be defective. Also make sure you use Minolta brand toners!