Black Cartridge just changed, but still says K-toner low

Make sure that Ready or Sleep is displayed in the LCD panel.
Select Change Toner X (The letters C, M, Y, or K appear in place of X, indicating the colors Cyan, Magenta, Yellow, and Black.) in the Reset Menu on the control panel.While the cartridge X you selected above moves to the cartridge replacement position, Please Wait appears on the LCD panel.Replace Toner X appears in the LCD panel when the cartridge to be replaced reaches the cartridge replacement position.Then Open Cover A.Push up the right lever to unlock the toner cartridge. Then remove the toner cartridge from the printer.

K toner is refering to black toner. Here is a link to Epson for your Aculaser C1100 Reference Guide. Look under Setup & Maintenence for >Replacing Consumable Products..... click on 'Toner Cartridge' for the proceedure.
http://support2.epson.net/manuals/english/page/aculaserc1100/ref_g/index.htm

Well if the margins are not the issue, then I would change it.

But before that, try taking a cotton swab, and cleaning the "k toner", the bottom part where the ink comes out. This way before investing more money into your printer, this 'k toner' might just needed a bit of cleaning.

Good luck

K = Black toner

inset new toner or refile toner just install new toner and second is reset the toner chip
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Toner K low refers to the black toner.

If you wait until the colour has completely run out, you will see a message to that effect, and the correct cartride will be presented. If you wish to change before this:



1. On the printers' control panel, press the "right" button (labeled no. 3) once and then the "down" button (labeled no. 4) until you see the RESET MENU.
2. Press the "right" button (labeled no. 3) once.
3. Press the "down" button (labeled no. 4) until you see "CHANGE TONER X" appear on the screen (where X is either C, M, Y or K, Cyan. Magenta, Yellow or Black).
4. Press the "right" button (labeled no. 3) once. The printer will rotate the toner carousel to the correct position for you to change.
5. Open the printer door and change the toner as normal.

Try powering the unit off and on. The toner indicator does not always reset immediately in my experience

Replace Toner with gen cartridge.

 

Or Take cartridge back as faulty after checking that it was opened and installed correctly.

 

Check display on printer for indications that maybe it needs one of the 3 colour toners indicators are Y,C or M

 

K is black

go to the reset menu (right arrow and then down arrow until reset menu is displayed) on the lcd display and then choose change toner #(right arrow until the desired toner is displayed) Hope this helps