I want to move this topic out of the fuser issues to its own topic to keep the discussions separated to go more in-depth on this issue. The more I read about this problem, the more I think we may be experiencing this to some degree and may have been misdiagnosed by our techs.

Can those of you who have experienced or are experiencing the inboard to outboard color inconsistencies, describe what the artifact on the press sheet looks like?

Was it more noticeable in a particular color?

Was the pattern banding, streaking or mottle or a combination of all of these artifacts?

Is the banding or streaking low frequency or high frequency?

How many impressions did you have on your Igen when the problem began?

What steps did your CSE take to diagnose this problem, before running the 614?

Thanks for your input.

The biggest issue we have always had is rainbowing of solid colors, most obvious in a 3 color gray without GCR.



Yes, usually Cyan first, then Magenta, can't hardly see it in Yellow unless you run a red. Black is always bad, but in the process direction not inboard to outboard.



It seemed to be mostly harmonic, replacing the developer housing donor rolls seemed to improve it. Gears in the developer housing have also been replaced and helped.



Not sure what you mean, if you are asking if they bands are close together or far apart, then they usually are further apart then closer together.



No idea, the problem seemed to get worse after our first year, which had about 10mil on it. It comes and goes after about 3-4mil impressions.


Besides taking us down for a week each time, calling in a specialist and eventually an engineer from Rochester? Like I said, now they replace the doner rolls, check for wear on the developer housing auger gears and a couple other things. Then they run 614 after replacing every part and cleaning up everything and doing a developer change. The good news is we only are down for 2-3 days for all of this.

No knock on our CSE's, they do everything promptly and quick as they can. Their hands are tied, and this problem is incredibly difficult to fix, also, it can take days to properly identify and fix. I can't afford days and days of downtime to fix. Last year I had 4 separate incidents with service that brought us down for over 1 week while I waited for Xerox to fix the isse.

Good luck with trying to get your issue fixed.

Patrick, Thanks for your response. I know how being down for several days can be very frustrating, while a problem is being worked on. Our last downtime lasted 3 days, but during our first 6 months we had a period where we were basically up & down for 3 weeks before Engineers from Rochester had to come in after our machine shut it's self down after the second week of the problem - for what ended up being a Toner Concentration Sensor that got severely out of calibration.

Our current issue - has been diagnosed as Severe Harmonic Streaking but it still seems to plague us, even after the Power supply boards have been replaced in all the colors and with us rotating, and replacing wire mods as we have been instructed to do. Our problems began occurring around the 10 mil impression mark for the engine. If we get it to clean up by doing the above, it reoccurs a short run time later.

We are seeing high frequency fine line streaks on the inboard edge of the sheet of Cyan that almost gives the Cyan halftone a drop out of color due to the high number of streaks (50% screen looks more like 10%) then the pattern moves more to a low frequency Harmonic streak across the sheet. We also are having similar issues in Black & Magenta,Yellow unsure. Regardless, of what I try the problem reoccurs or never totally goes away. All patterns work across the sheet inboard to outboard but in the process direction, with the exception of Magenta which in addition to the above, we are also seeing a low frequency Band appearing inboard/outboard also.

When printing a Green halftone mix, we are getting a blotchy Mottled looking green, I am also seeing similar in the Orange/Red screened diagnostic sheets - which I suspect yellow is not printing uniformly either. In the CMY - combined diagnostic halftone, we are seeing what I could describe as a rainbow - no uniformity in the coverage - very streaked with individual colors standing out - not a uniformed coverage at all.

Does this sound anything like what you have seen?

Tracy,
I had about the same experience as patrick with the exception that ours was in the Yellow mostly and in the Cyan. Greens were a big challenge for a while. We have about 7 mil impressions...

Dale

our problem colour seems to be cyan mainly on inboard edge and where only on 1.5 million impressions!

Thanks for your responses, I have my tech coming this morning to run a DC614. I'll let you'all know if it clears up our problems.

Just wanted to update our issue - The 614 seemed to worked in all colors except Black, where it solidified the harmonic streak artifact into the new profile. The tech had to revert the 614 profile back to the original profile to get black to smooth back out. We also had a wacked out TC Sensor in black - Our Black Toner Concentration was at 2X+ the normal level (maxed out the Toner Concentration Optical Read tool), which also was adding to our problems.