I have noticed that when I am printing several large posters or banners I start to get banding. When I run the test I find several printheads are clogged. I run the clean cycle and all is well for a while but it will do it again after lots of prints. Any ideas?
The following assumes that you are using OEM inks that are not out of date and that you are cleaning the caps RELIGIOUSLY every day the printer is used! If not, get all of the crud off of the caps first by cleaning them thoroughly with the approved swabs and capping fluid. It may take a number of swabs if you have not been meticulous before. You should/must be printing the color bands as well on each job.
Enter Cap Cleaning cycle
Put a couple of drops of capping fluid in each cap
Close printer doors to end cycle and allow head to cover caps
Let sit for a few minutes (5 or so)
Run normal cleaning cycle.
For a quick sanity check run the h-adjust print in maintenance mode and make sure that all nozzles are now open. This works like a champ for Seiko printers and should do the same on the HP 9000. Note that the printer must be left with media loaded when not in use (overnight or weekends), preferably a banner material that will not buckle rather than vinyl which may cause head strikes during automatic cleaning cycles due to temperature variations buckling.
If this doesn't work you probably have a hardware problem causing ink starvation and need a tech. The color bands should give an indication of which ink/head is having the problem.
