I have had the same problem. At first I could clean the waste container and it would be happy. After a while I needed to get a new waste container. Then I needed to clean the LED. After that it would run for about an hour then come up with the error. Today I couldn't get it to go at all without the error unless I manually lifted the black flap with the waste toner cartridge out. So I pulled it apart again and had a look at the transmitting LED through my digital camera (It allows you to see the infrared beam from the LED) and it was very dull. I replaced it with another infrared LED that I had lying around the place and the new one was considerably brighter. Seems that the LED itself has been failing. Will see how this one goes. To replace the LED. I opened the top cover and both end covers. The last top cover is held in with 2 screws, remove those and lift it at the screw end and it flips off. Remove the two screws on the top of the front cover. Remove the paper tray and then remove the waste toner cartridge. Remove the 7 screws there that you can see holding the plastic on. I also removed the two screws that hold the plastic straps that stop the side from dropping down. With the screws out, there are two little nubs on the bottom of each end of the front cover that hold it at the bottom, ease the cover off these as you pull the front cover forward. It will come off easily, no undue forcing it. Beware that the front display wire is attached, no need to disconnect, you can put the front cover on top of the printer out of the way. You will then see the LED detector, it has a screw in the middle securing it, remove the screw and then it unclips out. In the back of it are the Tx and Rx LED's. The TX LED is clear, the Rx LED is dark. The PCB is marked with which is which as well. The problem one is the clear TX LED. Another infrared LED with a forward drop of about 1.2V is required, not sure what wavelength it is, but I sure a general purpose infrared LED from a hobby electronics store will do the trick. Unsolder the LED, fit new one. Make sure it is around the correct way (the flat side is marked on the PCB). Reassemble your printer and you should be good to go. If you don't feel comfortable pulling you printer apart and attacking it with a soldering iron, then I am sure an electronic repair shop could do it for you if you show them this message. I would imagine that they could get the job done in under an hour, took me 30 minutes.
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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.
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.
The wate motor transfers (you guess it) waste toner to the waste toner bottle. If the bottle fills up, the motor cannot transfer more waste to it. This is rare, for the printer should ask for a new waste toner bottle when the previous one fills. However,it happens frequently when users try to empty and clean the bottle instead of replacing it.
If a new waste toner bottle is in place, then the printer needs a new motor, which can only be purchased through an Authorized Service Center.
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!
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