[Misc] C7000 thin multiple lines (only black) on one side of the paper

[Honpress]

Hi, it's me again! (The amateur) Hopefully someone can help me out.
Having this problem for a while and can't really figure out what's causing it.
I've added a picture of it.

Small black stripes.jpg

A few months back, I've replaced all developers (not developing units), drums with the cleaning blades and the coronas.
But I keep having only thin black lines on the same place (area). They go from left to right, covering the whole paper.

Sometimes I revert the black, it goes away for a few prints, but comes back soon after.
I swapped the drums a few times, to exclude the problem are these, but nothing changes, the thin lines are still in the same area.

Could it be the developing unit? Count of black is 1.029.865. What else could it be if it's always only black?

[wjurls]

Re: C7000 thin multiple lines (only black) on one side of the paper

Hi, it's me again! (The amateur) Hopefully someone can help me out.
Having this problem for a while and can't really figure out what's causing it.
I've added a picture of it.

[ATTACH=CONFIG]61123[/ATTACH]

A few months back, I've replaced all developers (not developing units), drums with the cleaning blades and the coronas.
But I keep having only thin black lines on the same place (area). They go from left to right, covering the whole paper.

Sometimes I revert the black, it goes away for a few prints, but comes back soon after.
I swapped the drums a few times, to exclude the problem are these, but nothing changes, the thin lines are still in the same area.

Could it be the developing unit? Count of black is 1.029.865. What else could it be if it's always only black?

When you say you "swapped the drums" Do you mean you moved the old drums around? Or did you install a new drum and properly calibrate it?

Moving old drums around isn't always conclusive. I suggest installing a brand new drum and charge corona for black and reset the counters and run the gamma correction.

[tulintron]

Re: C7000 thin multiple lines (only black) on one side of the paper

Hi, it's me again! (The amateur) Hopefully someone can help me out.
Having this problem for a while and can't really figure out what's causing it.
I've added a picture of it.

[ATTACH=CONFIG]61123[/ATTACH]

A few months back, I've replaced all developers (not developing units), drums with the cleaning blades and the coronas.
But I keep having only thin black lines on the same place (area). They go from left to right, covering the whole paper.

Sometimes I revert the black, it goes away for a few prints, but comes back soon after.
I swapped the drums a few times, to exclude the problem are these, but nothing changes, the thin lines are still in the same area.

Could it be the developing unit? Count of black is 1.029.865. What else could it be if it's always only black?

I'm almost certain these lines come from the transferbelt cleaning unit.

[blackcat4866]

Re: C7000 thin multiple lines (only black) on one side of the paper

It should be simple to diagnose. Run a few pages of heavy fill black. Disassemble the machine to examine the black drum, the black primary charge grid, the transfer belt, and the fuser film. Any residue on the surface of the black drum or transfer belt will be seen easily and wipe right off (unfused, and you'll see overspray of toner on the blade where it's cleaning poorly). A corroded primary charge grid may cause this. And the fixing film may cause it. The next part is up to you. =^..^=

[Albonline]

Re: C7000 thin multiple lines (only black) on one side of the paper

Hi, it's me again! (The amateur) Hopefully someone can help me out.
Having this problem for a while and can't really figure out what's causing it.
I've added a picture of it.

[ATTACH=CONFIG]61123[/ATTACH]

A few months back, I've replaced all developers (not developing units), drums with the cleaning blades and the coronas.
But I keep having only thin black lines on the same place (area). They go from left to right, covering the whole paper.



Sometimes I revert the black, it goes away for a few prints, but comes back soon after.
I swapped the drums a few times, to exclude the problem are these, but nothing changes, the thin lines are still in the same area.

Could it be the developing unit? Count of black is 1.029.865. What else could it be if it's always only black?

if its truly only on one side ,look at transport rollers in the inversion and adu units.

[Honpress]

Re: C7000 thin multiple lines (only black) on one side of the paper

When you say you "swapped the drums" Do you mean you moved the old drums around? Or did you install a new drum and properly calibrate it?

Moving old drums around isn't always conclusive. I suggest installing a brand new drum and charge corona for black and reset the counters and run the gamma correction.

Hello wjurls, thank for your response!

The drums are not really old, I've replaced all of them the same time a few months ago. But if I swap the entire drum unit with another one, say yellow. Wouldn't that change the quality of the whole image? Because it contains the drum and cleaning blade.
The corona's were replaced around the same time as the drums.

[Honpress]

Re: C7000 thin multiple lines (only black) on one side of the paper

I'm almost certain these lines come from the transferbelt cleaning unit.

Hello tulintron, thank you for your response!

But if the transferbelt cleaning unit is the problem, wouldn't that have affect on all the colors?

[Honpress]

Re: C7000 thin multiple lines (only black) on one side of the paper

if its truly only on one side ,look at transport rollers in the inversion and adu units.

Hello Albonline, thank you also for your response!

Sorry to ask, but what are the inversion and adu units? Is this a short for some parts?

[Albonline]

Re: C7000 thin multiple lines (only black) on one side of the paper

Hello Albonline, thank you also for your response!

Sorry to ask, but what are the inversion and adu units? Is this a short for some parts?

the path the paper takes after first side is printed, to go back around again.

[Honpress]

Re: C7000 thin multiple lines (only black) on one side of the paper

the path the paper takes after first side is printed, to go back around again.

Thanks. Yeah, they were a bit dirty (totally forgot about those) so I cleaned them all. Seem to work for a while, but somehow the thin lines are back, but not continuously.
And with that, the corona of black was full with black toner. Don't know why there's so much so I cleaned it. Didn't really do anything on that lately.

[ANAS-MOUCHAFI]

Re: C7000 thin multiple lines (only black) on one side of the paper

Hello,


Check the output part of the oven, the PAPER EXIT GUIDE PLATE. Is there any fixed toner on this plate?

[Albonline]

Re: C7000 thin multiple lines (only black) on one side of the paper

Thanks. Yeah, they were a bit dirty (totally forgot about those) so I cleaned them all. Seem to work for a while, but somehow the thin lines are back, but not continuously.
And with that, the corona of black was full with black toner. Don't know why there's so much so I cleaned it. Didn't really do anything on that lately.

if your consumables are good and the cq adjustments were preformed when new supplies were installed, I would look at the anti misting vacuum system. the entire pathway including the fans gets clogged with toner.

[Honpress]

Re: C7000 thin multiple lines (only black) on one side of the paper

Hello,


Check the output part of the oven, the PAPER EXIT GUIDE PLATE. Is there any fixed toner on this plate?

Hello ANAS-MOUCHAFI,

Thanks for your respond. Didn't see any toner on those. But I did see this kind of blade in the fuser unit was really dirty (added picture of it)
fusing.jpg So I've cleaned this part. This is the cleaning blade of the fusing belt? Still busy replacement other parts as well, so can't test it yet.

[Honpress]

Re: C7000 thin multiple lines (only black) on one side of the paper

It should be simple to diagnose. Run a few pages of heavy fill black. Disassemble the machine to examine the black drum, the black primary charge grid, the transfer belt, and the fuser film. Any residue on the surface of the black drum or transfer belt will be seen easily and wipe right off (unfused, and you'll see overspray of toner on the blade where it's cleaning poorly). A corroded primary charge grid may cause this. And the fixing film may cause it. The next part is up to you. =^..^=

Hi blackcat4866, thank you for your response!

I have a few parts that need to be replaced, so maybe that will do the trick. But I did saw a lot of black toner beneath the black drum. The drums and coronas can be better, so going to replace all of them.

[Honpress]

Re: C7000 thin multiple lines (only black) on one side of the paper

Hello,


Check the output part of the oven, the PAPER EXIT GUIDE PLATE. Is there any fixed toner on this plate?

Hi ANAS-MOUCHAFI, thanks for your response!

I checked those, but they are clean. I'm still having the same problem