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the top of the waste toner container must be cleaned 100% from the toner because it should be a light sensor that has to pass through it , if its spoiled with toner the light cannot pass through it ,so i recommend you to empty the waste toner container first and wash it with water and drying it well before using it again.
If your machine is displaying "replace waste toner container" then you can empty the waste toner box & reset the machine.
If you open the front door you will see a large black box & above this a small rectangular green button. Pressing this button will release the black box. The box will then lift upwards from the machine. At the bottom of the box you will see a round, clear plastic bung, remove the bung & empty the waste toner into a suitable bag or container. Once emptied, the bung can be re-fitted, the waste box can be inserted back into the machine. Locate the waste box into the 2 slots then push the waste box firmly back in place until it latches. Turn the machine off & on using the switch located to the left of the waste box in the bottom left corner of the inside of the front door. This should reset the machine. Be careful when disposing of the waste toner, it is flammable so do not dispose of in a fire. Hope this helps.
The C25 stores toner in a waste toner container. On the front of that container there is rectangular clear window that fits into a sensor when installed into machine. The sensor passes a beam of light through that window. When the bottle is full there is toner inside that clear plastic window which stops the light from making it through the window and the machine will tell you the waste toner is full. Just dumping the container out will not clear that window and by putting it back in the machine you will get the same toner full message. If you are going to try to reuse that container you will have remove the black plastic cover that is glued to the container above the clear plastic. Then use something like a Qtip to clean all the toner off of that clear window(much easier and faster to just replace in with a new container). if you still get the waste toner full message after you install it then remove it and wipe off the sensor that the clear window sits in. This will clear the message and you can continue your copy job.
Wear breathing protection as there will be toner dust in the air.
Place flat in a work area and remove the 6 screws retaining the black box cover and carefully remove cover with box still flat on the work area. Be careful, the box is full of waste toner powder.
Dispose of the waste toner by tipping into waste container, being careful not to inhale the powder. Use a blower or vacuum to remove final traces of waste toner from the box and clean all surfaces with a clean cloth.
Place the box flat on the bench and inspect the clear sight-glass at the front. Inside will be a black flag which should be down on the bottom of the sight glass. If not, there is still waste toner in the front of the box which needs to be shaken or blown out.
Replace the cover and 6 screws and replace the waste toner box in the printer.
If error message still says replace waste toner box, then you need to check the sight glass again. The flag must be horizontal at the bottom of the glass or it is not completely empty.
Are you using a new waste toner container or did you empty the one that was already in the machine?
The machine uses a sensor that looks at the container to determine if it is full of waste toner. If there is toner on the inside sides of the container were it looks for toner it will indicate that it needs to be replaced even if you have emptied the toner out.
It is a good practice to replace the waste toner container with a new one, that is the way the machine is meant to be used.
If you have correctly installed a new waste toner container and the message hasn't cleared you may have a faulty sensor.
The "waste tank" is located behind the front panel that has the SAMSUNG name on it. Press on the upper corners of this panel and it will open up to reveal a clear plastic tank on the right side.
This tank pulls out easily and has two holes for excess toner to flow into it.
Look at the side of the tank that has the holes. You should see a part of the tank that extends out from the tank but ends in a clear square. The waste tank sensor "looks" thru this clear plastic square to determine if the tank is full. I.e. if toner is in this area and you cannot clearly see thru both sides, the sensor will tell the printer that the tank is full and needs to be changed.
If the tank is not full, use a long cotton swab and clean out the inside of this area. Once you can see thru both sides, carefully replace the tank back into the printer and turn the printer back on.
If done properly, the error should go away and you should be able to continue printing. I have doen this and it works fine.
(Some posts have had people cut this part of the tank off and simply tape over the hole that is made with strong tape. This bypasses the sensor and would allow the printer to run again. I have not done this as I do not want the possibility of toner spilling in my office.)
The sensor could be bad and causing the issue. If this is the case, it may be cheaper to purchase a new printer - CLP-620 ND is a duplex, networked color laser jet that is selling from frys.com for $315.