Digital BW, The Print

There is a vent system built into the top of the carts...it's the 
very little hole that is initially sealed over when you get the new 
cart...you remove the covering tape before using the cart. This vent 
hole reaches the inner ink chamber via a long channel snaking it's 
way across the top side of  the cart...then to a vertical tbe going 
all the way to the bottom of the ink chamber. The vent air is 
carefully controlled...too much and the static pressure of the ink 
above the ink head will cause leakage by gravity. Too little vent air 
and the ink can't get out at all. 

So a leaking rubber plug at the fill hole will lead to leakage. I'm 
not sure if the ink leaks from the print head itself or from around 
the poppet valve seals. So far I have not seen a leak in my system 
(refilled it once so far). Next time I will place some tape over the 
fill holes as extra protection.

Mike.

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Steve Kale 
<stevekale@b...> wrote:
>
> Why would letting air in be a problem?  Air has to come in else no 
ink can
> come out.  I would think the plugs are simply there to prevent 
spillage if
> the cart not placed in an upright position. Surely leaks at the 
print head
> are an issue with the poppet valves.
> 
> 
> > From: Mike Dobbs <mdobbs@a...>
> 
> > 
> > Over on the DPReview.com forum, there has been some discussion of 
the
> > MIS Clear Cartridges and those little rubber plugs...some folks 
have
> > reported ink leaks at the print head and suspect the rubber plugs 
are
> > not sealing correctly, letting air in as the ink flows out t he
> > bottom. I'm thinking a litte bit of black electrical tape over 
these
> > holes (with ot without the rubber plugs in place) should do a very
> > acceptable job of making an air tight seal...and will be easy to 
lift
> > off for refilling later.
> > 
> > Mike.
> > 
> > --- In 
DigitalBlackandWhiteThePrint@yahoogroups.com, "kenstrain2000"
> > <kenstrain2000@y...> wrote:
> >> 
> >>> As I posted a little while ago, an e-mail from MIS support said
> > that 
> >>> plugs are not used on these clear 2200 cartridges...
> >>> 
> >>>> (On the other hand I had problems too, with leaks.)
> >>> 
> >>> Oh crap, I don't need to here about that...! :)
> >> Well if the hole is meant to be open there can't be a problem 
due to
> >> any small leaks:)  I am not sure which cartridges you have.  Your
> >> first post mentioned the online support for them as saying there 
were
> >> plugs.  
> >> Ken
>