I have a continious inking system and ink streak. we took it apart and cleaned the ink ports and the ink runs through the tubing firn

Streaks can come from several sources. Since you said they appear near the end of a plot, the print heads may be running out of ink before the end of the job. This would happen if you had air in the ink tube system and consequently in the heads. When the printer is idle for a while, ink will migrate to the bottom of the print head so when you print again it is ok for the first part of the plot and then gets to the air bubble.

Open the back door of the plotter and look for air bubbles in the ink supply lines. If air is present, it needs to come out. There is a purging tool at Designjet Ink Tube Priming Tool . The print heads may need to be replaced, but not before the tube system is clean.

The green roller is the drum which has a cleaning blade to remove excess toner, when the drum gets older it becomes clogged and will dump toner back out onto the drum. Just some info on it. Best fix is replace the drum, you could take it apart and attempt to dump and clean it but it's rarely worth doing that.

I would try using something like rubber renew on the pickup rollers and make sure that the paper is being fed correctly. If this is happening then start looking at the ink.

Open the printer and remove the ink. Clean around the ink carriage and the under the ink with alcohol and a cotton swab. Pay special attention to areas with copper contacts. Some printers will let you re-run a cleaning utility from their system menu or the computer printer properties. Keep in mind too that some printers will not print correctly, even with full ink, if the exact type of ink it expects you to have is not installed. If all else fails change out the ink, but double check that the ink is correct against the manual or written instructions inside the printer. Not every cartridge that fits the printer necessarily is the right type and using the wrong ink can cause unexpected results.

When I had the same problem, I found out, that Epson did not like Generic Ink. As soon as I replaced it with Genuine Epson Ink, it was fine.

Make sure you do Maintenance, Nozzle Check and Head Cleaning. You might be clogged?

Good Luck.

That's a neat trick. The 4100 is a printer that uses one BLACK toner cartridge. It doesn't print in color. And it doesn't use ink.

This is more than likely a ink cartridge failure. If you are using after market/or refilled ink cartridges, I would try an OEM cartridge to clear the problem. The non-OEM ink has probably clogged the nozzle.
Change the cartridges, run a deep cleaning on all colors, run alignment and the test page. The problem should clear up.
Sometimes non-OEM inks are not up to specifications and cause this problem.
Let me know if this clears the problem.
Please make sure to rate this solution. Thanks.

Take the cartridges out, then unplug the machine so the cartridge holder stays in the middle. Take a bunch of wet q-tips and clean all around where the ink would come out. Check rollers and anywhere the ink could have dripped. Double check the maint. station, sometimes there is a wiper thingy that jumps up to wipe the inks.

check your ink levels. if its the ink that came with the printer it is probable running out of ink. they do not give a full cartridge with printers, only about 3rd full. also try cleaning the heads. and try changing your printer settings/prefrences to less ink, more drytime see if that helps.

ok..save the window..those print heads are clogged, and good. You MAY need to run that print cleaning at least 8 times, to get that gook out of there.

http://tinyurl.com/6qcpgy

you can try both the options if it works then well and good.