Digital BW, The Print

You have to flush. There's not much discussion because there's no 
question. You have to flush. MIS doesn't write that documentation for 
their health - they write it for yours.

The 7600 doesn't use a valve that will prevent backflow into the carts. 
If you just pull the UC color ink carts and replace them with the UT7 
carts, the UC ink in the ink lines will flow back into your UT7 carts 
and contaminate them. This is, as Martha would say, a very bad thing.

How do I know this? I'm using PiezoTones in my 7600. After a while I 
decided I was using one "flavor" for 90% of my work, so I dropped the 
other one when it ran out. I rinsed out the three carts with cleaning 
fluid, then filled them with cleaning fluid and reinstalled. That is, it 
was clean and clear when I installed them. When they ran out the second 
time (that many head cleanings - most of them automatic), for some 
reason I pulled what little was left, expecting it to be clean. It 
wasn't - it was the same color as the ink in the lines. As I said, there 
is no backflow preventer.

For the record, those three lines have had about five carts (110mm) 
worth of cleaning fluid through them now, and I can still read the 
nozzle checks for one of the channels. Ink is still clearly visible in 
that line.

You have to flush.
--
Bruce Watson


brigsby707 wrote:

> I've just spent the better part of an hour searching the forum for
> information on whether or not using cleaning cartridges is necessary
> when switching from UC to UT7 on the 7600 (I just picked up a used one
> on ebay :-) happy, happy!). Obviously if I can avoid spending $100+
> for a collection of cartridges I will never use again, I'm all for it.
>
> I've come to the conclusion that in the last couple of years there has
> been no general agreement on this issue and am wondering what the
> current consensus is, or if opinions are still divided.
>
> Any thoughts, advice, etc. welcome, especially considering that aside
> from my 1280, I'm entirely new to the realm of the wide printers.
> And, from what I've read so far on this list, they are an altogether
> different class of beast.
>
> Thanks in advance,
>
> Eric
> www.ericashworth.net
>
>