Epson stylus sc6400 printer says it is out of ink, it is not out

SOURCE: Clean "Waste Ink Cartridge" Epson R300

Had the same problem. (its a work around without removing the waste ink pad)
Took alot of work but I fixed it.
Frist thing you need to know that error means your ink waste pad is full. Its a $75.00 to replace but there is a work around it.
You will need this free app. SSC service utitlty.
http://inkjetprinterhelp.us/epsonSSC.html Its a great app.
Instrusctions are on the website there.
You will also have to Open the access panel on the rear of the printer (remove screw) and look inside carefullly with a flashlight. You will see a tube (down and to your left) coming from the cleaning pump and it will have an open end on it. This is the tube that delivers ink to the waste pad.
Use a piece of coat hanger wire or equivalent, and fish out this piece of tube. Bring it to the outside of the printer, thru the access panel.
Find yourself a suitable container (Tupperware or a plastic cup or jar) that is not too tall. Put the tube into this container and secure the tube and container so they won’t come apart or lose connection if the printer is moved.
If you wish you can make a hole or notch in the access panel cover so it can be replaced.

SOURCE: epson stylus photo 950 printer flashing lights

I had the same Problem and checked the solution:
This is a Printer Maintenance request.
Ink Overflow -
you sould change the waste ink pads under the printer mechanic.

Solution:

SOURCE: epson stylus d92 won't show ink levels

hello
Download the the driver again and reinstall it.
http://esupport.epson-europe.com/ProductHome.aspx?lng=en-GB&data=wsMoc1iChVGcisk9ncQeIBmTUU002FxOg74o84TjGD6F5MAU003D&tc=6

SOURCE: changed black ink cartridge for epson stylus d120 but not working

Usually when this happens the printer fails to goes through the motions of the printing process, kind of stands still with indicator lights just blinking away. This could be as a result of either of these scenarios.
i.                     Ink cartridge has developed incompatibility or is incompatible
The Solution is to try an older/another cartridge (doesn’t matter if ink is finished. You must replace cartridge one at a time). If lights stop blinking it confirms that your cartridge has become incompatible or developed incompatibility. Also if your printer is the type that can work with only one cartridge, remove one after the other (closing back the lid/cover) to determine which in the set (black or color) has become incompatible. At the instance the incompatible one is removed and you close the lid, the blinking will stop (for printers that can print with one ink cartridge only). Just replace the incompatible one and start printing again. In most cases the issue is always with one cartridge. But if both are affected, you have to replace both. Because of this type of problem, always keep used cartridges somewhere safe; they come in handy for this type of troubleshooting.
ii.                   The Cartridge electronic panel  is dirty
The electronic panel on the cartridge that makes contact with the cartridge carrier inside the printer is dirty and needs cleaning.  This electronic panel is front part of the cartridge with copper “dots”.
The Solution is to try to clean this panel with a piece of folded tissue paper soaked in a bit of methylated spirit. Also try to clean the area in the cartridge carrier/holder that makes contact with the cartridge’s electronic panel (Usually this is more difficult). If you cannot reach it with your fingers, use a stick or something with tissue wrapped around it. Allow to dry well and return the cartridges, close the cover. The blinking should stop if the electronic panel is the issue. Once the blinking stops the printer will print.

SOURCE: Epson Stylus SX400 "Ink cartridges cannot be recognized"

Try this: First check which cartridge(s) are not being recognized. In my case where I replaced all three color cartridges, two were recognized right away but one was not. You find out by sending a print request to the printer and looking at the ink cartridge levels diagram in the dialog window. In my case two of three were fine but one had a red X on it. So I removed it and cleaned the contacts with alcohol then rocked it in the slot after pressing it in. It was recognized and the charging process began as normal.