vertical banding

Wondering if anyone else has dealt with Canon and come up with a solution for this problem. Essentially we're getting vertical banding on almost all coated or uncoated medias, and it becomes more apparently on heavy dark colors. Lighter colors you don't really notice. We've tried so many...

There is the issue of dark/pure color canvas print from L570. The position of uneven print is specific, 2 -3 places, vertical along with the print. I though it was the issue of canvas itself, but this issue happened lessly on L360. I have to spray the varnish liquid to cover the issue...

This stays for a couple feet, then goes away. Please help!! Or could it be in the image? All nozzles are clear!

We have been noticing a vertical banding on our printing lately on our HP FB500. Specifically on large darker colored sections. (see attached photos) We have tried re-leveling the printer (at the advice of an HP tech) we have tried checking the belt fans and cleaning the belt thinking its not...

We're getting vertical banding (bands going up and down) on canvas. The weird thing is it's only happening in highly-saturated cyan areas like the the sky. Here's a pic... We're printing on a GS6000 using Colorburst 9.6.1. A tech just replaced the print heads. Nozzle check is perfect...

The diagonal banding is actually a shadow, not in the print. 1 - What do you think the problem is here and what is the solution for future prints? 2 - Do you have any suggestions to get me through I'm pretty sure my problem here is heat (too much maybe?) and excessive ink related but I need...