Have a fresh K toner cartridge and had to change the K drum. Now the printer displays the message that the toner is empty, and it is not. How do I reset or correct this?

If your printer is displaying "Toner Empty" error message even though the toner is full, there may be several reasons for this problem.

First, you may want to check if the toner cartridge is seated properly in its slot. Sometimes, the toner cartridge may not be fully seated, causing the printer to think that the toner is empty. Try removing the toner cartridge and then reinserting it, making sure that it is well-seated.

If reseating the toner cartridge doesn't resolve the issue, the next step would be to clean the printer's toner sensor. The toner sensor detects the presence of the toner cartridge and its level, and if it's dirty, it can cause the printer to display the "Toner Empty" error message even when the cartridge is full.

To clean the toner sensor, you will need a soft, dry cloth. Open the printer's front cover and locate the toner sensor. Gently wipe it clean with the cloth, making sure not to touch any other parts of the printer.

If these steps don't work, you may need to replace the toner sensor or the printer's firmware. In that case, it's best to contact the printer's manufacturer or a certified technician for further assistance.

The toner cartridge is only a supply chamber. The cartridge simply dumps toner into the feed hopper in the drum. When you change the drum the feed hopper is empty and it is likely that the cartridge dropped the last of it supply into the hopper - ergo it is now empty. I recommend shaking the toner back into the cartridge before separating the cartridge from the drum unit when changing them

Open the toner cartridge door. Press clear on the console. A message shold display saying "replace drum? press 1 or 2" press the corresponding number to reset the drum counter. This is a very important step when replacing the drum as it actually changes the voltage setting for the dc power regulator. If not performed, and a partially used toner cartridge is in, waste toner can be pulled out of the cartridge and can contaminate the drum unit.

unfortunately the drum within the cartridge has reached end of life so changing to a new drum cartridge would resolve this issue.

Did you replace the waste (used) toner cartridge or the empty toner cartridge? These copiers have 2 "cartridges" .... one is waste (used) toner, the other is "new" toner for copying / printing etc. Some newer copiers have All in One units....Drum, New Toner, Waste (used) Toner. If you replaced the Waste Toner container (or dumped it) that should reset the code or error message.

Hello, these printers tend to be finicky.

In other words, just replace the black toner. When the printer says its low, or empty, regardless of wether or not it is, just replace it.

Replacing the drum, when it says black toner needs to be replaced will do nothing to rectify the issue.

Buy only HP Toner and Drum cartridges for this printer. Do not try to refill toner cartridges, and do not reset drum. You will only end up destroying your printer in the process.

Installing the Toner and Drum Cartridges
Installing the Toner Cartridge
Installing the Drum Cartridge
CAUTION: Before performing any of the following procedures, read and follow the safety instructions in your Owner's Manual. Installing the Toner Cartridge Install or replace the toner cartridge while the printer is on (if the power is not on, the cartridge carrier will not rotate).

1. After confirming the Insert Yellow Toner (Y)message, open the front door.
   
   

1. Hold the tape on the protective cover and pull it forward to remove the cover from each cartridge slot.
   
   

NOTE: You need to remove the protective cover only the first time that you install the toner. NOTE: Dispose of the protective cover after you remove it. NOTE: The protective cover is attached to each toner cartridge mount.

1. Make sure the color of the toner cartridge matches the slot on the toner cartridge carrier. The order is Y, M, C, K. Gently shake the cartridge to distribute the toner evenly.
   
   

1. Lift the tab up 90 degrees and pull the toner seal straight off, keeping it parallel with the toner cartridge.
   
   

1. To insert the toner cartridges, align the arrows on the cartridge with the corresponding arrows on the printer. Guide the cartridge in until it snaps into place and then push down the handhold to lock the cartridge in place.
   
   

1. Close the front door.
   
   

NOTE: Make sure the toner cartridge is installed correctly. Otherwise, the front door cannot close firmly.

1. The toner cartridge carrier rotates to the next empty slot. When the color of the newly inserted cartridge appears on the display, followed by the Insert message, insert the next toner cartridge.
   
   
2. Repeat steps 1 through 7 when inserting the remaining cartridges.
   
   

Installing the Drum Cartridge

1. When the Insert Drum or Insert Drum Cart message appears, open the front door, then lift and push back the top cover.
   
   

1. Remove the protective sheet from the drum cartridge.
   
   

1. To insert the drum cartridge, push up the lever on the right side of the printer. With the lever in the upright position, hold the drum cartridge by the handle, align the arrows on the drum cartridge with the corresponding arrows on the printer and guide the cartridge in until it snaps into place.
   
   

1. Pull down the lever on the right to lock the drum cartridge in place.
   
   

1. Close the top cover, then the front door.
   
   

NOTE: After installing the drum cartridge, the printer makes an adjustment for about one to two minutes. Do not turn off the printer during this time.

I have a brother mfc 7840w

I first used the electrical tape trick and that worked for a while. Then got the toner low message again. I then tried the *00 trick, which works as follows:

1. lift lid and open front cover
2. press clear/back. "Replace Drum?" will appear on the screen.
3. Press "*00" it will then read accepted and the toner low error (End of Toner Life) should go away.
4. close it all up and your done.

go to the reset menu (right arrow and then down arrow until reset menu is displayed) on the lcd display and then choose change toner #(right arrow until the desired toner is displayed) Hope this helps