Digital BW, The Print

I have had this problem, on and off, with my 1280 with
the MIS CIS UT2 inkset.  For the first six months it
was great and I was finally getting the kind of prints
I had been looking for.  Then it started putting those
narrow black/grey lines in a print.  I tried the clean
cycles and the PURGE6 images from CIS.  Sometimes it
actually got worse.  Right now, if I print at 360dpi
it will print without the lines, but if I try 720 or
1440 the lines are back.  I am currently working
around the problem by printing in BO as I get no lines
there.

I have read somewhere that this is caused by a failure
in the PC board inside the printhead which results in
one or more nozzles being always on and not being
controlled by the driver.  If true, it means the head
is toast and the printer will have to be replaced. As
a last effort I am going to remove the CIS and replace
with the OEM inkset and see if this fixes the
problem..... we shall see.

Jerry in Houston