This ink separation looks to be printed correctly, but shows your magenta/shade 4 channel isn’t printing at all, and I don’t see a noticeable difference between the shades 5 + 6 (LM and LK channels).
I recommend checking your magenta cartridge to make sure it is properly filled, contains ink, air vent hole is open. Tap the filled cart exit valve on a folded paper towel a few times to force air up and ink down, then reinstall into your printer (the printer will do an automatic cleaning cycle after reinstalling the cart), then print a nozzle check. If nozzles in the M channel aren’t all printing, do up to 3 cleaning cycles and nozzle checks to try getting it to print fully, but if it’s not good after that- let me know (and don’t continue doing cleaning cycles).
Below is an example of a printed ink separation sheet I made (on Epson Enhanced Matte paper with Piezography Neutral inks, printed with our R2880, and density measurements marked at 60/80/100%). Another example can be found on the ink separation page printing instruction page. In both of our examples, you can clearly see a difference in each ink shade. After reviewing your latest ink separation print, I have a few questions:
Did you print on plain typing paper, or an inkjet paper? I ask because I see what looks to be waviness in the ink strips, which can happen when printing on thin uncoated paper, and it can be slightly less obvious to see density differences in ink shades when printed on an uncoated paper.
After reviewing your order history, I see you’ve purchased three sets of R2880 refill carts, the most recent in July 2013. I also see you purchased the Digital Negative Meth3 Selenium ink set in July 2013, and set of Carbon K7 inks in June, along with other Piezography inks prior to that. Did you just fill carts and start using the Carbon inks for the first time, or had you previously filled/used the Carbon ink carts with good results, and recently went back to using Carbon, but have poor/different results? Did you shake ink bottles and double check the ink shade/cartridge position prior to filling/refilling carts to make sure ink is in suspension for full/correct density, and ink shades are installed in the correct order (and not mixed)?
Please let me know so I can help you past this and back to happily printing.
Best regards~ Dana