Digital BW, The Print

At 01:49 AM 1/9/2003, you wrote:
>I have a 1270 loaded with MediaStreet dye ink and a CFS. Nozzle checks
>are perfect and will print letter size perfectly. Soon as I try 13 x
>19", I get some nozzles dropping out. Specifically, black and cyan. The
>nozzle check will sometimes show some black ink lines mixed in with the
>cyan line position when this happens. (cartridge problem?) I have
>already wrecked 5 13x19's this way. Soon as it happens, I run a nozzle
>check and usually one cleaning cycle will do it for a perfect nozzle
>check. I can then print letter size with no problem, but then 13x19"
>turns up the problem again. I tried raising the bottles a little, but
>this gave me another problem of ink blotches, so I put them back down. I
>am beginning to think that the CFS is to blame and for some reason can't
>keep up the inkflow with the larger papers being printed. Anyone have
>something similar happen?
>
>Murray Z.


How old is your CIS?  If it's more than a year or so, you may have a 
clogged cart(s).  I had problems similar to this and replacing the CIS 
carts solved it.  It seems that the lines and/or the carts can get clogged 
due to evaporation of the black vehicle from the ink.  Nozzle checks can be 
fine, since they have very low ink demand, but printing a 13X19 is a much 
higher demand on ink flow than printing test or a letter size image.  To 
test for ink starvation, print a solid black sheet (letter size will do) at 
*high speed*.  If it begins to show white lines halfway through the sheet, 
you've found your problem.

hope this helps,

Peter