Digital BW, The Print

Hello,
last weekend I really went through hell.

I installed a set of UT in my Epson 7500. After filling the cartriges 
everything went fine so far. I couldn´t get a good nozzle check in 
the evening so I waited untill the next morning and it seemed that 
the problem had settled down. So I tried a first printout with Pauls 
curves wich were not bad. Suddenly after another sheet of paper black 
ink purged like drops on the paper and the black was nearly totaly 
blocked. So I did an "initial fill" cycle to get air bubbles out. 
After many attempts of cleaning and intitial fill cycles I am still  
not getting a good nozzle check or print out. When I print a "print 
pattern" from the service menu I can see od horizontal misalignments 
in the black. These alignments lines behave like declining curves but 
there are no dots missing. I don´t have any explanation for that. All 
other inks work fine.

Please help with any ideas. Is there a way to get the ebony black 
working well? I really hope I haven´t damaged the printer.

Another thing: I know some people sucking out ink from the tubes with 
an negativ fill adapter. Can someone give a good description may be 
with pictures how to do this?

Regards,

Ingo Meyer