Help Diagnosing Print Quality

streetsnake

Active member
With the help of everyone figuring out how to tackle the calibration issue, I've run into another issue on the Xerox C70. I was trying to do some test runs with 80C and 100C and ran into this issue. Can anyone help me diagnosis were it seems to be coming from. I'm guessing one of the rollers but I'm not entirely sure, nor how to tackle the problem. I've tried tried various settings but nothing has fixed the issue.
Roller line.jpg
 

DYP

Well-known member
Is it lead edge to trail edge or inboard to outboard?

If lead edge to trail edge I would run a sheet of each color at 50% and see which one it is coming from. First clean the ROS window of the offending color. If that doesn't clear it swap drums with one of other colors that is good. If it doesn't follow the drum then look for contamination in the developer housing. If it is in all colors then look at the IBT, the 2nd BTR or the fuser.
 

streetsnake

Active member
Is it lead edge to trail edge or inboard to outboard?

If lead edge to trail edge I would run a sheet of each color at 50% and see which one it is coming from. First clean the ROS window of the offending color. If that doesn't clear it swap drums with one of other colors that is good. If it doesn't follow the drum then look for contamination in the developer housing. If it is in all colors then look at the IBT, the 2nd BTR or the fuser.
I apologize in advance as I’m still learning my terminology. This is my first “production“ printer. The stock is being fed SEF and runs the entire inboard/outboard width. (You can’t see it where the color diminishes but it is still there). Does that change you recommendations?
 

DYP

Well-known member
I apologize in advance as I’m still learning my terminology. This is my first “production“ printer. The stock is being fed SEF and runs the entire inboard/outboard width. (You can’t see it where the color diminishes but it is still there). Does that change you recommendations?
Yes that does. If it runs inboard to outboard how often does it repeat? How many MM?
Is it on all colors?
 

ColorMonkey

Well-known member
Looks like your well covered on this one if DYP is helping you out however, I just wanted to ask a couple questions.

-Are you positive you are running short-grain meaning the grain of the paper is parallel to the lead edge of the sheet?

-Also when you run your test are you running one sheet at a time or several 3-4? If you haven't run several in succession (or you have) does this move or is it always in the same place?

-Also is this cast coat or a high gloss? If it is, measure the unprinted are at the lead edge of sheet untill it reaches the image area and then see if the distance matches the width of what you are seeing on your sheet. Thermal ghosting affects the sheen of the toner but shouldn't disturb the actually dot, or image. Just not sure by that picture what I'm actually looking at.

Take care
 

streetsnake

Active member
Yes that does. If it runs inboard to outboard how often does it repeat? How many MM?
Is it on all colors?
Please see attached. It is 112mm apart. It’s difficult to see when the image isnt dark but it’s still there.
 

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streetsnake

Active member
Looks like your well covered on this one if DYP is helping you out however, I just wanted to ask a couple questions.

-Are you positive you are running short-grain meaning the grain of the paper is parallel to the lead edge of the sheet?

-Also when you run your test are you running one sheet at a time or several 3-4? If you haven't run several in succession (or you have) does this move or is it always in the same place?

-Also is this cast coat or a high gloss? If it is, measure the unprinted are at the lead edge of sheet untill it reaches the image area and then see if the distance matches the width of what you are seeing on your sheet. Thermal ghosting affects the sheen of the toner but shouldn't disturb the actually dot, or image. Just not sure by that picture what I'm actually looking at.

Take care
I'm running 18 x 12, so that is long grain, correct?
I ran 3 copies just now...they are not in the identical spot but very very very close
I'm actually not entirely sure what kind of paper it is. It's definitely not high gloss. I "borrowed" it from my brother who is a high-speed printer. I do have the paper rep coming tomorrow with some paper for me. Both satin and high gloss.
 

DYP

Well-known member
Just so we are talking the same thing. If your standing in front of your printer inboard is to the back and outboard is to the front. Lead edge to trail edge is the direction the paper moves.

At 112mm you have a defect in a component. If you should have a Repeating Defects Page that is all ready printed or one you can print then you can check witch part is 112mm in circumference.

If you have a service contract have them look at it.

If not refer here
 

streetsnake

Active member
Just so we are talking the same thing. If your standing in front of your printer inboard is to the back and outboard is to the front. Lead edge to trail edge is the direction the paper moves.

At 112mm you have a defect in a component. If you should have a Repeating Defects Page that is all ready printed or one you can print then you can check witch part is 112mm in circumference.

If you have a service contract have them look at it.

If not refer here
Yes, unfortunately no contract. Gotcha on inboard/outboard. The defect runs inboard/outboard. Thanks for the link. I’ll take a look and see if I can figure anything out and report back.
 

streetsnake

Active member
Here are the test prints. Any thoughts?
 

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DYP

Well-known member
You will probably need to run 50% or 75% to get a better idea. Also find out what part is 112mm in diameter.
 

streetsnake

Active member
Here is 75%. How am I supposed to figure out what part is 112mm? Call Xerox? Last time I did that they wanted me to pay $805 for 30 minutes on the phone. I texted the only technician I know and he hasn’t responded. Ugh.
 

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DYP

Well-known member
Surely someone on here has a Repeating Defects Page for a C60 or C70. But I think there should be a document with that info in the Service Mode test pages.

First look at these darker prints my suspicion is that it is the 2ndBTR. Does the defect show on all stocks? The sheet look like it could well be that the transfer voltage needs adjusted for the stock you are running. Run the routine for the transfer voltage adjustment. Another way I used for years to test is to run 100% of both Cyan and Magenta. You can do that in service mode. Should be titled as Halftone test page.
 

streetsnake

Active member
I just thought…when I ran those test sheets, I was only using 60 text. I ran new ones using 80 cover. Much easier to see now. I also was able to speak with a tech. He was thinking a drum or fuser. I have a fuser coming and the company I purchased it from is sending a black drum. Attached are updated photos with 80C. The defect is on all sheets, although hard to see on the yellow. I did not see the halftone selection.
 

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tngcas

Well-known member
Keep in mind that the black drum is ALWAYS live on every color. So even when you're running magenta it will always trigger the black drum. You can spot issues with the black drum if you swamp black with another color.
 

DYP

Well-known member
I just thought…when I ran those test sheets, I was only using 60 text. I ran new ones using 80 cover. Much easier to see now. I also was able to speak with a tech. He was thinking a drum or fuser. I have a fuser coming and the company I purchased it from is sending a black drum. Attached are updated photos with 80C. The defect is on all sheets, although hard to see on the yellow. I did not see the halftone selection.
If there is that much difference with cover weight than yes the fuser or pressure roller needs looked at. A Repeating Defects Page would tell you what to look at.
 

streetsnake

Active member
Does anyone know where to find the "repeating defects page" on the c70? I cannot locate it anywhere and cannot find an article online referencing the c70
 

streetsnake

Active member
Hi Everyone,

It looks to have been the fuser. Replaced it and the repeating defect disappeared. Thanks for the help everyone.
 

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