Digital BW, The Print

From experience with a few 1270/80/90 printers, it could be either 
clogging or air problems.  It is important to distinguish between 
these as the cure is different.  Air locks tend to block (nearly) a 
whole "colour" at a time, whereas clogs are often partial.  

Hopefully you know to clean using exactly 3 cycles then make a small 
print (perhaps a purge-pattern, but the main thing is to reset the 
counter on the cleaning cycles). Doing more than 3 cycles in a row is 
often counterproductive.  If after 2 or 3 sets of 3 there is still a 
problem you should look at another cause.  (For air leave a while to 
give a chance for bubbles to move, for clogs try one of the more 
agressive cleaning techniques, such as pulling the head over a wet 
sponge - with care.)

It has been claimed that Eboni interacts badly with any residual dye 
inks that may be left on the parking pad.  I believe I saw this once 
immediately after changing over to that ink. This caused clogging 
every day until I cleaned the pad (with water, then a little 
compatible ink base). After that there were no clogging problems. 
Other explanations have been given for clogs, but I don't find most of 
them very convincing, so won't comment further.  

Air trouble could be caused by poorly fitting carts, in which case try 
another.  I had every conceivable problem with spongeless refillable 
carts, and that eventually drove me away from this approach (together 
with a couple of print head failures).

Ken

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Craig Roberts 
<crgrbrts@...> wrote:
> However, my print heads seem to be clogging, 
> requiring repeated cleaning cycles, if the printer sits idle for 
even a 
> day.  Has anyone else experienced this?  Or -- is it possible that 
I'm 
> introducing air bubbles during the refill process and experiencing 
> "vapor lock"?