Digital BW, The Print

>>and verify that you have vacuum in the system. If you don't, those bubbles
in the
lines won't move, in which case you need to go looking for air leaks.<<

Additionally, it could be that you have a mother of a clog/sludge problem in
the black ink's tubing.  That is the problem I had.   Use the large 60cc
syringe to create a strong enough vacuum to break the clog loose (10cc
didn't have enough "power" in my experience).

Doug