Need Help Roland VG2's Banding Issues

[bartm160]

About a year ago, we bought two lightly used Roland VG2's from different places. After about 10 months, we began having horizontal banding issues on both printers around the same time. The banding appeared to be more prominent in the Black ink but it banded throughout all the colors, although the nozzle checks look perfect.

The tech tried a variety of tests, and minor fixes from small to larger including replacing the cap stations, dampers, etc. until we ended up replacing the black heads in both printers. We thought that would solve the issue but it didn't, we're still having the same issues. When we do multiple strong cleanings, and or damper fills, the prints come back flawlessly but after about a few yards of printing, the banding comes right back again.

The tech has been out again multiple times and is now leaning towards thinking we're using the wrong color profile, so he set it to the correct material and it seemed to be better and the banding disappeared. After he left, the banding started right up again.

We are really perplexed by this and can't figure it out. It seems to us like it could possibly have something to do with the feed rate or damper not refilling fast enough but the tech said the dampers open and fill automatically.

Any ideas?

Thanks

 

[weyandsign]

Post a clear photo of your heads and also the banding in the prints, and bi directional gap adjustment and nozzle check.

 

[bartm160]

Post a clear photo of your heads and also the banding in the prints, and bi directional gap adjustment and nozzle check.

 

[bartm160]

Post a clear photo of your heads and also the banding in the prints, and bi directional gap adjustment and nozzle check.

 

[cornholio]

This is really strange. Do you use Versaworks to print?
Have you done a nozzlecheck immediately after it prints with banding?

 

[weyandsign]

Was your head changed by a certified tech? I see some problems on the nozzle check pattern, and looks like a tiny bit of debris on some of the heads. Clean off the debris, and print solid blocks of CMYKOG and post what that looks like.