Streaks appearing in Gloss Stock

Hi, we have a iGen4, diamond edition. It has been printing great up until 2 days ago. After the pressure roll and fuser fluid has been changed, which I doubt has anything to do with the issue. Any gloss coated stock appears with streaks, mostly on the outboard side. Starting at the leading edge and disappearing towards the trailing edge. All decoratrons, mod wires, discorotrons and pinscorotrons have been replaced. Developer housings have been cleaned. However if I change to a matt or offset stock the streaks disappear. The streaks reduce greatly but still there on Xerox Colortech gloss. All paper weights around 113gsm to 170gsm.

 

Clean or replace the STAB

 

Are you talking gloss differential streaks or streaks in the actual color(s)?

 

sounds like a typical roller oil mark ...do they fade away as the oil drys?

 

If I run separate sheets with 50% tint of C,M,Y,K the marks are very visible. Starting at the leading edge and fading away to nothing about 100mm from the trailing edge on a sheet which is SRA3 size. The marks are just visible on the 100% C,M,Y,K. If I just change the stock to matt finish and alter nothing the marks don't appear. I have tried several different stocks of gloss and matt and all have the same characteristics. It looks very much like something has been dragged along the toner prior to being fused. The streaks are darker than the background 50% tint.

 

No, the marks appear prior to fusing.

 

Hi, problem sorted, the TAB blade. After chasing the issue around all the connections, power supplies, I asked the Tech to change the TAB blade and the press is back to normal again. Thanks everyone for your help.

 

Mark was the man on that one!

 

I have much problems when that blade starts to go.

Learned that just about the same way you did a couple years ago, spent a whole day on it...... turning out to be a 5 minute part replacement I had on the shelf. had bizarre streaks in all solid colors, randomly, no pattern.

glad you got it!

 

I mentioned to the engineer about changing the TAB the day before, the streaks didn't look like they were caused electronically more mechanical. So I insisted after reading Marks suggestion. Very handy forum, thanks.