MXC311 light streak

[Dustin(WOP)]

Hello all!!!
I am having some trouble with an MXC311 giving a light streak on trailing edge of paper. If I run 5 sky shots, I ussually get one that is like the example I have posted, and the others are fine. It happens really randomly. It is only on black, I have ran about 20 sky shots with other colors and have not gotten it to do it. I looked through bulletins and have not seen anything that could help me. Has anyone ever had this before? Can anyone lead me in the right direction?
I have replace the BK drum unit, and today I am going to change the DV unit and see if it makes any difference. Thanks for any info!!!! Happy fixing!!

00004e004adc.pdf

[OMD-227]

Well, it cant be the drum, because it would have repeated down the page several times. We both know the drum rotation circumfrence on the Frontiers is very small, so 4 or 5 of those marks would have appeared if the drum was scratched or damaged.

When you say skyshot, do you mean a real skyshot with the ADF open, or a solid engine print of a color in sim 64-01?
The first image looks alot like a solid engine print, while the second image is obviously a copy of that. Am I right? Otherwise, its a damn good skyshot the first one.

Ruling out a problem with the optics would be where I start from. Running solid engine prints will confirm this.
Check for a small scratch on the glass too.

It looks more like a problem with the glass. If it was something in the optics, all skyshot copies would have it. If it was a engine based problem, it would repeat at a consistant ratio.

Knowing if the first image was an engine print (skyshot) or a true skyshot with the ADF open would help abit more.
And, does the small mark on the solid black pages appear as a black mark on a white page?

[Dustin(WOP)]

Wazza: the first one is a true sky shot from the same copier. It can't be the optics as it does it on self print engine tests as well.

Thought I would add this to make it a little more interesting:
The display is flickering while making copies. Not sure if this is related to my problem, but now that I see that I am thinking it has to be a power board issue. Any other thoughts? Thanks thus far!

Update: it is also doing it in color!

[DavePo]

Have you had a look at the connectors in and around the scanner section. I would look at the SCN CNT PWB and the wiring harnesses.

[rayjeek]

I will take onboard the info provided by DavePo. I remember those days with Xerox, on one of their machines produces the same image posted whenever there was a break in the scanner ribbon cable. Try reseating PJs on SCN Pwb or replace ribbon cable.

[Dustin(WOP)]

Hey
thanks for the responses! However, I don't think it can be anything within the scanner as self print engine tests do it as well.