I was given a 4900 by an owner who no longer needed it. When I received it, it was loaded with piezoflush in an attempt to clear out several clogged channels. I have made progress getting the head cleaned. The latest effort involved removing the selector assembly and flushing that with piezoflush - it still had old ink in it.
After doing this and running an ink charge, I now have all ten channels printing. If I print a ten-color print page, I get six colors in nice dark piezoflush pink and four colors in light piezoflush pink. There isn’t any obvious banding on the 10-color print page. What explains the difference in the darkness of the four light pink channels? (I am assuming that all of the colors should print piezoflush in an even pink.)
Also, I am only getting three colors to print with a nozzle check: Y, LM and LC. LC is one of the colors that prints light pink yet it prints a perfect nozzle check. M, OR and GR print dark pink on the 10-color purge page but do not print at all on a nozzle check. Is there any obvious explanation for this?