HP 6040 - banding

[OutlawTorn]

Hey all,

Having serious issues with one of these boxes of nails - customer getting greyish/black banding on all copies and prints (not consistent banding, in different places and smaller/thicker on each page)

Looked at the ITB and it seemed to be a simple cleaning unit failure so swapped out the ITB unit, no dice.

Then I changed the the roller unit and black drum, still no luck.

Tested fusing unit, fine.

Performed cartridge disable to test all drums and doesnt seem to be any of those causing the problem either!

Has anyone ever seen anything like this? My only other thoughts are the laser unit but normally that doesn't give banding? Possibly dirt on the mirrors in the laser unit?

Help!

[wseyller]

Could be the high voltage.

Sent from my Galaxy Nexus using Tapatalk 2

[Iowatech]

Re: HP 6040 - banding

I'm still a little bit of a noob for HPs, but I do have some machines in harsh environments and have seen what happens when the spinning mirror in the laser unit gets contaminated, and banding is probably not caused by that, you'd more likely see the left hand side of the print get lighter, and as the 6040 is a color machine you would likely notice that in some fashion for all colors. At least from what I've seen so far.
I'd check out the suggestion from wseyller, and maybe check the condition of black drum unit to make sure there aren't any defects in the photoconductive coating of the drum, too.

[OutlawTorn]

Re: HP 6040 - banding

High voltage you say? Interesting.

I have already replaced the black drum so it's definitely not that.

The machine is situated on a construction site so it experiences pretty harsh enviromental conditions for sure.

[JustManuals]

Re: HP 6040 - banding

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[Wild Bill]

Re: HP 6040 - banding

Did you change just the black drum unit or both toner and drum units. I would think it was the toner/ dev unit possibly.

Calibrate the product
Calibration is a product function that optimizes print quality. If you experience any image-quality
problems, calibrate the product.
1. Scroll to and touch Administration.
2. Scroll to and touch Troubleshooting.
3. Touch Quick Calibration, or touch Full Calibration.
4. Touch Calibrate.


Internal print-quality test pages
Print-quality-troubleshooting pages
Use the built-in print-quality-troubleshooting pages to help diagnose and solve print-quality problems.
1. Scroll to and touch Administration.
2. Scroll to and touch Troubleshooting.
3. Touch PQ Troubleshooting.
4. Touch Print.
The product returns to the Ready state after printing the print-quality-troubleshooting pages. Follow the
instructions on the pages that print out.


Good luck

[OutlawTorn]

Re: HP 6040 - banding

Wild Bill, I ran the machine in cartridge disable mode without the black toner and drum in and I still got the same banding so I'm thinking that would rule out them as the fault?

[fixthecopier]

Re: HP 6040 - banding

On my Bizhubs, lasers can transmit electrical noise as they go bad and it will be inconsistent. Had one yesterday. It can be lines and they will move, however I have never had this on an HP, but I have not serviced that model and some HP and Konica engines are the same. Can you post a sample?

[OutlawTorn]

Re: HP 6040 - banding

I have attached examples!

[Wild Bill]

Re: HP 6040 - banding

I see a slight but of Magenta on that maybe focus on that one a little?

[ucinn]

Re: HP 6040 - banding

Hey all,

Having serious issues with one of these boxes of nails - customer getting greyish/black banding on all copies and prints (not consistent banding, in different places and smaller/thicker on each page)

Looked at the ITB and it seemed to be a simple cleaning unit failure so swapped out the ITB unit, no dice.

Then I changed the the roller unit and black drum, still no luck.

Tested fusing unit, fine.

Performed cartridge disable to test all drums and doesnt seem to be any of those causing the problem either!

Has anyone ever seen anything like this? My only other thoughts are the laser unit but normally that doesn't give banding? Possibly dirt on the mirrors in the laser unit?

Help!

What's the fuser look like? If they do a lot of full colors the fuser can cause this especially if the heat roller has lost it's shininess.

[OutlawTorn]

Re: HP 6040 - banding

I took another fusing unit and tested that but the fault still happened.

I suppose it could still be the fuser as I didnt put a new one in - probably unlikely to get the same fault across both fusers though.


Escalated the fault to HP themselves and I'm still waiting for an answer!

[HP:guy]

Re: HP 6040 - banding

What happens when you change the paper setting to a heavier paper?
I think it would slow it down get the toner to fuse better.

[prntrfxr]

Re: HP 6040 - banding

Stopping the paper in the path can rule out the fuser. Did you try new cartridges?

Image involves DC Controller > HVPS > Cartridges > Transfer Belt. I don't think it's scanner related at all. Try your consumables first. Seems to be worse on yellow and magenta. I would go DC controller before HVPS, because HP's HPVS's are usually pretty solid (not saying they can't fail, just less likely).

[OutlawTorn]

Re: HP 6040 - banding

Hey all,

Got the customer to move the machine into an office where it won't experience such dramatic environmental changes and also swapped out all the toners.

Seems to be working for now so fingers crossed!

Thanks for all the feedback.