There is a sensor just behind the waste toner box that sends beam through the water toner box to see if reaches the other side. If it does not, then the sensor thinks that the box is full. So you need to clean the waste toner box with some liquid cleaner so that it looks white from outside. Once the box is dry, try again. This should work now.
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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.
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.
The sensor seems to send light through 3 small, clear "windows" on the left side of the waste container. I emptied the small amount of waste into a plastic bag for disposal and then used compressed air (outside) to blow out the remainder of the container, making sure the windows were clear. Presto! All good in the hood.
No you should not empty this bottle. It is designed to keep the excess toner inside itself and should be disposed of properly.
NOTE: To return the used Waste Toner Container for recycling, follow the instructions included with the new container. If the instructions or shipping label are not available, click on the [Recycling] link under the Product Resources section of this window for additional information. Follow this link for detailed instructions on how to replace the bottle once you have a new one onsite.http://www.support.xerox.com/SRVS/CGI-BIN/WEBCGI.EXE?St=161,E=0000000002703235792,K=5302,Sxi=14,Case=obj(1554)
Hope it helps!
The waste toner bottle is located behind the front cover, you should be able to open the cover and remove the clear plastic container. After emptying the container, you need to make sure that the portion of the container that comes in contact with the sensor on the machine side is clear of any toner, as the sensor sends a beam of light through it to determine if the container is full. After doing this, you may need to reset the machine.
The life of the waste toner container unit is approximately 1,250 pages for full color 5% image printing or 5,000 pages for black printing. When the life span of the waste toner container has expired, Replace/Install Waste Toner Tank appears on the display of the control panel, indicating the waste toner container needs to be replaced. Otherwise your printer stops printing.
To replace the waste toner container:
1 Turn the machine off, then wait a few minutes for the machine to cool.
2 Open the front cover.
3 Pull the waste toner container out of the machine using its handle.
--- above from manual, following is my paraphrasing due to lack of pictures --- 4. remove the container cap from the back side and cap the opening
5. take the new waste container out of its package
6. install the new waste toner container.
___________ You may wish to TRY EMPTYING the waste toner, but you will find toner is the messiest and possibly dangerous (inhallation, etc) stuff you've worked with. it is an extremely find powder and can cause an awful mess and is best disposed of by capping and replacing the container with a new one (shop around to find them).
DO NOT attempt to vacuum up toner - just my personal opinion - I suspect many vacuums may not have fine enough "bags" to capture this intentionally very fine dust. BUT Toner vacuums do exist and some "may" work.
First thing to do (if not yet done so) is to access the printer through the web admin interface by typing the printer's IP address in a browser. This gives a lot more information than the blinking lights.
The Status page of the web admin interface may say "toner low" or "toner empty" or "error on toner sensor" and that will tell us which color cartridge to handle.
Note that the OKI 3400n has the annoying tendency to fail when loading in a new toner cartridge: a color is low or empty, you put in a new color tube and then the printer says error on that very color! This can be fixed by pulling out the drum of that color (the drum is that entire block which includes the color tube and the container below it; avoid touching the shiny green roller), and lightly tapping on that drum to evenly distribute the new powder inside the container.
You may have noticed that the once the color tube is loaded in, what it does is to empty its content into the container below. Which means that it's no use swapping color tube once it's installed because the color tube is empty by then, and is just kept there to prevent the ink powder from spilling out of the container. The caontainer itself has 5 electrical contacts on its side used to measure the powder content and the lifetime of the drum.