Digital BW, The Print

Hi all,

I'm getting unusable prints on my 2100 (Euro version of 2200). 
Running 
the UT7 inkset through the MIS clear refillable carts since years and 
used to 
cleaning occasional clogs with Windex. This time after a fairly long 
period of little use I have a single position that is just not 
clearing.

I've tried Windex overnight and even bought the cleaning solution 
from 
fixyourownprinter.com and followed those instructions faithfully 
twice 
(each time trying both the injection through the printer nozzle and 
leave overnight technique and the parking pad saturation and leave 
overnight routine). Each effort followed by 3 nozzle cleans and a 
nozzle check. Nozzle check remains bad and my most recent one shows a 
few other channels not laying down correct ink patterns either. I've 
tried printing 
again just to see if that clears things and the prints are still 
unusable.

I've done a little digging around and find some posts saying MIS 
cartridges can also have air lock problems. How do I determine if 
this 
is a clog or an air lock issue? What, in either scenario, is the fix?

Frustrated here.....this printhead was replaced about a year ago and 
I 
don't want to do that again. At the same time, very happy with my 
results using UT7 and QTR...

Any and all comments welcome,

Dave Meddings