[Image Quality] Thin line won't go away on Konica bizhub Press C6000

[tulintron]

I'm having an issue with a printer I started servicing, it's a Konica Minolta bizhub PRESS C6000 and it has 1.8m clicks. It looks very good and clean and all the consumables are still in good shape, nothing with more than 90%.

So, it's printing a thin line only noticeable with the black color as you can see in this A3 prints I've scanned and attached. It's also only noticeable when printing greys, if its full black it won't appear.
It's worth to mention that this line gets thinner some days, like 0.2mm and other days it gets thicker, but never more than 1mm.

Attachment 51385Attachment 51386Attachment 51387
I have already clean the laser glass and changed the corona with a new one and the problem persists.
I've ran out of ideas, anyone could help me?

Good Morning. In the first photo you refer to a very thin black line as the problem. In the second photo, she clearly appears only in black.

I would unplug the laser and also the wiring harness for all lasers, clean and try again.

[Cantechman]

Have a look to see if there is some sort of fiber, hair or dirt that is blocking the image from getting to the drum. Look in between the gap between the dev unit and drum on the transfer unit side. I had that issue once and it a piece of lint from my rag that was stuck in the laser path.

I'm having an issue with a printer I started servicing, it's a Konica Minolta bizhub PRESS C6000 and it has 1.8m clicks. It looks very good and clean and all the consumables are still in good shape, nothing with more than 90%.

So, it's printing a thin line only noticeable with the black color as you can see in this A3 prints I've scanned and attached. It's also only noticeable when printing greys, if its full black it won't appear.
It's worth to mention that this line gets thinner some days, like 0.2mm and other days it gets thicker, but never more than 1mm.

Attachment 51385Attachment 51386Attachment 51387
I have already clean the laser glass and changed the corona with a new one and the problem persists.
I've ran out of ideas, anyone could help me?

[wjurls]

I failed to see this thin black line through colors in pic 2.

I didn't see the note in the pic saying that the white line was from the scanner. Just noted "Thin line"

[tsbservice]

I didn't see the note in the pic saying that the white line was from the scanner. Just noted "Thin line"

Picture 1(as far as I can see) has two arrows with remarks clearly describing white line isn't issue.

[Konicatech]

How does the fuser belt/rollers look?

[tulintron]

I failed to see this thin black line through colors in pic 2.

black line.jpg

[tulintron]

I'm having an issue with a printer I started servicing, it's a Konica Minolta bizhub PRESS C6000 and it has 1.8m clicks. It looks very good and clean and all the consumables are still in good shape, nothing with more than 90%.

So, it's printing a thin line only noticeable with the black color as you can see in this A3 prints I've scanned and attached. It's also only noticeable when printing greys, if its full black it won't appear.
It's worth to mention that this line gets thinner some days, like 0.2mm and other days it gets thicker, but never more than 1mm.

Attachment 51385Attachment 51386Attachment 51387
I have already clean the laser glass and changed the corona with a new one and the problem persists.
I've ran out of ideas, anyone could help me?

joaopaulooo, disconnect the IC from the printer.Just turn on the printer and print test pattern number 55, 62, 75.


From these tests, we will have other concepts.

[tsbservice]

black line.jpg

I was meaning CMY colors

[tulintron]

I was meaning CMY colors

Yes. The fault appears only in black. I suspect some bad contact or noise in the controller connection cable. If not, I change to SCIPB or PRIPB board. But we need to do tests.

[joaopauloooo]

Remove the transfer belt, K drum and corona and thoroughly clean the black plastic part that the K corona sits on.

I get those lines after very humid days, cleaning the part I described has always fixed the problem, that you are currently facing, for me.

This one really worked! It always happened when the weather was humid. Thank you!