If you remove the metal tray cover on the right side under the maintenance station you can see two small lines feeding into the large waste line that goes to the waste container, or a F manifold depending on the year of your printer. First make sure the large line to the bottle is clear. Secondly inspect the two small lines from the maintenance station that feed to the larger line. I squeeze between my fingers to feel for any clogs. If any clogs are present remove the small lines from the feed tube, (larger tube that goes to the waste bottle), or the F manifold, depending on which year your printer is, and remove the clogs. I feed solution into the capping area and watch to see the fluids run down both small lines as this does two things, lets you see if fluids are running through with no clogs, and cleans the lines. If clogs are present I remove the end of the small line that feeds down and roll the lines between my fingers and work the pencil lead sized clogs out and re-attach the lines to the waste bottle and re-flush with solution. I also use a seringe with a butt splice on it that attaches to the smaller waste lines to flush the maintenance station out and clean using solution. Be sure and move the head to the side as you don't want to damage it while it's parked at the capping station. You should feel the solution moving freely through the tubes and maintenance station, if not fill the lines and the capping station with solution while connected to the seringe and let stand for ten minutes and suck the fluids out. Get fresh fluid in there and fill the lines and half of the capping station and park the head on tha cap and place in low position. Gently, key word here, gently pull on the seringe you should feel a bit of back pressure, if not either your maintenance staion is out of place or is in need of a replacement. You shouldn't hear a slurping noise like drinking the last of something with a straw, but rather feel a resistance.
After all this run a little charge and watch the last process, the sub tank refill, and it should not run too much more than 12% to accomplish this. You should see ink being pumped through the lines and be able to gently squeeze the small waste tubes while this is hapening and feel a pretty good amount of pressure. Do NOT squeeze hard or block the lines, just merely feel the pulse so to speak. If this procedure runs until 20%-98% their is a problem with the maintenance station. If all this happens and after two or three consecutive nozzle checks you see no improvement, try another few head soaks and rinse and repeat. After all this if the maintenance station checks out good and there is still no change, and the missing nozzles are consistently the same ones that are missing and not moving around to different nozzles, probably time for a new head.
Sorry for the long windedness, let me know if their are any questions. I can send you a video of the procedure.
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