Mpc2500 blank line

[CableGuy]

Hi all

I am having an intermittent problem with a MPC2500. Basically it puts a light line across the direction of travel, only once on the page, usually about 4 inches long. The paper is a glossy A3 100gsm, always printed double sided, but it doesn't always make the line on both sides. I have run single colour and mixed clour sky copies, single and duplex. I cannot get this machine to do it for me. But as soon as I'm out of there, the blooming things goes and does it. I have made the adjustments recommended in RTB 222058, although these are more for toner lines on the page.

I have attached a sample of the problem.
Please, please, if you have any ideas, let me know.
Many thanks to you, my knowledgable friends

[ivacopy]

Line

First you have to test which color is problem and after to solve the problem
(test all apart cmyk).

[Eric1968]

It looks like a defective magenta DV-Unit. The part at the bottom of the page looks a bit orange with a yellow line (if I'm seeing it correctly). So I think you should look at the magenta DV-Unit.

(BTW, is this a color print, or a color copy?)

[msaeger]

Yeah just run the 100% test pattern for each color so you can tell which color it is.

[Urushiol]

If this is a print, not a copy id agree with the above posters, looks like Magenta developer unit. But as they said print out single color (CMY & K) test pages to verify its only in one color.

It if occurs on more than one color, on prints, it might could be ITB, or transfer roller. What is total copy count and count of dev/drum units?

If its only on copies, and not prints clean your optics .

[CableGuy]

Hi Guys

Thanks for your speedy responses.
Just need to clarify that I have done 100% coverage copies in single colour, duplex in some cases and everything was just fine. The image sample is of a printout, not a copy. So that discounts the scanner. And as mentioned before, this problem doesn't happen every copy. The machine has relatively low pm counts on it, the itb being the highest at 71%, all the others way under 50%. The overall print quality is fine, I think the machine I used to scan the image in, may be giving the illusion of odd colouring. All that has me puzzled at this moment is that short line across the page. The image has a beige sort of colour backdrop, it's the line within that backdrop, as indicated, that is the problem.
Apologies if I didn't make myself clear on what exactly I was asking. Was in a bit of a rush yesterday. But again, thanks for your ideas.

Cheers

[dckm]

It probably is magenta, but I think you may have some dirt migrating to the doctor blade. Defective DV unit, I would think it would do it all of the time if that were the case.

I think I would change the color developer. Relatively low cost, and less trips to the account.

[E Winter]

I'd go for magenta dv, too. Printing full page half-tone patterns is a good recommendation.

[CableGuy]

Update....

Hello again,
Just to let you know what's happened here. It seems that the problem with the blank line has cured itself. But another problem has resurfaced. On the same paper as before, 150gsm A3 glossy, every now and then it has black smudges on the print outs. I unfortunately don't have any examples at this point. I went in today and replaced the Black dev unit and the paper transfer roller (the transfer roller was just over its life, just). I'm now just waiting to hear if the problem is sorted or not.

[mikadonovan]

I hate to say this, but your blank line may come back. I had a problem exactly like this on this model, only it was with the black dev unit. I dumped the developer onto a large sheet of paper, sifted through it and found a couple of rock-hard chunks (about 2 or 3 mils in diameter). After fresh developer was installed the problem was resolved. I'm not sure about your black smudges. Need more info.

[CableGuy]

I'll give you an update if I get any bad news back from my customer. The blank line was more to do with the overall colour, including black. I'm thinking the paper type was part of the problem. It's one of those wierd ones, my gut tells me the machine likes the paper as much as a kid likes their vegetables......

[Frank12]

look like target glass dirty

[Frank12]

looks like target glass dirty

[CableGuy]

looks like target glass dirty

Forgive my ignorance, what is the 'target glass' ? Are you referring to the slit glass in the lazer unit? If so, I should point out the the line in question is across the direction of travel. But thanks for the idea.