The sensor for the waste toner tank is dirty or defective. The toner sensor is on the right as you look at the panel just below the liquid crystal display. There is a bump in the clear plastic just below the circular right vent port, that's where the used toner pours in. When you clean out the toner cartridge there is some residue left that makes the sensor think it's still full. Take a piece of paper towel and a small screwdriver (I'm told a bent coat hanger will work, too) and clean the inside of the sensor window inside the used toner cartridge (w/ access through the toner port). It looks like a little raised groove on the right. Just wipe it until it's clear on the inside. The sensor can now see through the window and you should be okay.
Otherwise, the sensor may need to be replaced by an authorized Samsung technician.
Let me know how it works out!
I was able to get my printer working again using Chris Yost's suggestions. BTW, I was re-using the existing waste toner tank. I did not replace it, I simply emptied it, then cleaned the inside of the little protrusion with a soft cloth held with needle-nose pliers.
The sensor itself weren´t dirty, but plastics in waste toner tank was bit dusty and sensor couldn´t read through it. So I modded waste toner tank a bit with a knife (took the part away which the sensor uses when reading if it is full or not). And works again beautifullu.
All I have to do know is to take care of waste toner tank manually i.e. checking it every now and then and when it becomes full I throw it away.
There is a plastic tab that sticks out and opens a small cover over that sensor. If that tab is missing (broken) then the cover will not open. It will stay covered and the printer control will assume that the dump tank is full.
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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.
There is a tank in the back/side compartment that keeps toner waste fluid. It is in a container like a water bottle and the fluid is black in color. Once you pull it out there is a full line and the liquid on the inside is what needs to be discarded. Empty the contents and replace the tank. Restart your printer and the error message should clear up.
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.
The Waste Toner Cartridge must be VERY clean, especially around the "bump" directly below the left side hole. After I CAREFULLY emptied the old toner out, I used air compressor to clean every bit of toner out from inside. Then I wiped the whole area around the "bump" where the sensor "sees" if the tank is empty. Even a slight film over the area will not allow for reuse. If you do this, it works every time.
this messages referes to the waste toner being full or not installed.
try to stop you from emptying the container by having a small "window"
that the printer looks through, when you empty the toner there will
still be some toner on this window, so the printer will still believe
that it is full.
a way around this is to wash the container out
with water (do not use hot water as this will melt the toner). i also
wouldn't recommend pouring the water & toner down the sink as this
could be breaking local laws.
What I have started to do is to actually wash the toner tank out with water and make sure it is good and dry then be sure the section that breaks the light sensor is good and clean (it is on the left side as you look at the backside - the side that goes toward the printer - and protrudes out) the tank full indication comes on when the tank gets dirty