bizhub C250i image defects

[tsbservice]

Howdy, folks! We have strange image defects see attached images.
Machine is almost new counter is 30k and only 1k color. Posted are halftone CMYK patterns at 30 and 200 density.
There are no errors in service history nor strange readings in voltages or TCRs.
I did it remotely as client is at remote location.
Second image should be magenta halftone at 30 density but appears grey, another odd one is black.
Anyone seen something similar?

[Cantechman]

It seems like a definite pattern on the top of each sheet, is there any damage to the transport belt? There's not a lot of parts that would cause that issue on all colors, i can't see it being a fuser as those wavy lines would be moved around more on the page, maybe a bad HV board where the initial signal is weak and causing it to look wavy? Just grasping at straws here lol.

[tsbservice]

It seems like a definite pattern on the top of each sheet, is there any damage to the transport belt? There's not a lot of parts that would cause that issue on all colors, i can't see it being a fuser as those wavy lines would be moved around more on the page, maybe a bad HV board where the initial signal is weak and causing it to look wavy? Just grasping at straws here lol.

Thanks Cantechman your opinion is always welcome. To add things complicated see attached halftones - low densities are missing and there are also those strange lines on black.
I suspect ITB too but M and K have another issue too...go figure. We will be on site in a few days with ITB, PH unit, maybe PS and HV unit.
I would appreciate any ideas as I absolutely hate to have callbacks.

[copytechtrouble]

yeah seeing as the same pattern is repeated across all colours in the same area, it definitely looks like something is up with the belt and i would say it needs a black drum as well.

[and]

The defect repeats every 65mm. For me ITB.

[Gift]

It's visible with all colors so probably ITB or maybe fuser. Neven theen this though. Also make shgure the paper stack has no defects, I've seen fresh paper already had wrinkles^^

You can also force a stop before fuser - if the image looks ok you have ruled out the ITB.

[Cantechman]

Thanks Cantechman your opinion is always welcome. To add things complicated see attached halftones - low densities are missing and there are also those strange lines on black.
I suspect ITB too but M and K have another issue too...go figure. We will be on site in a few days with ITB, PH unit, maybe PS and HV unit.
I would appreciate any ideas as I absolutely hate to have callbacks.

I would also make sure all the laser slit glasses are clean, dirt on those can cause some weird issues too, you can block off a slit glass with a piece of paper to see if it improves with one less laser in action. I had a C300i recently where all the colors were out of whack, i had to make a bunch of adjustments under image adjust, the only way to actually fix it was to replace all the drums. I would think the black drum is also an issue. But as someone else mentioned if you can stop it in between the transport belt and fuser it might give you a better idea where its happening.

[femaster]

I'm also thinking trans belt and possibly k-drum.

I'm betting that the color issues (like the magenta halftone that looks grey) are because the machine isn't getting a good pattern on the belt to properly calibrate the color levels. The potential issue with the k-drum and whatever is causing that wavy output is throwing down a pattern that isn't consistent with allowing the copier to calibrate correctly. Any P-Codes that you know of?

[Ziggy]

Possibly fuser belt bad on one side. maybe 2nd transfer roller not seated correctly

[tsbservice]

Thanks guys for help and advices much appreciated.
Next week I will be there and then update this thread accordingly.
femaster I like the way you are thinking but no P - codes as I was remotely in service mode and nothing suspicious and I know exactly where to look. That hobbles me too.

[femaster]

Thanks guys for help and advices much appreciated.
Next week I will be there and then update this thread accordingly.
femaster I like the way you are thinking but no P - codes as I was remotely in service mode and nothing suspicious and I know exactly where to look. That hobbles me too.

I didn't even pay attention to who posted the original message. Had I noticed it was you, I probably wouldn't have inquired about the P-codes since I know you are more than knowledgeable enough to think about checking those.

That is a very strange situation since there are no P-codes. I do like the idea that Markks presented. I wonder if maybe something with the transfer roller is not moving correctly. Perhaps it is binding up on the one end and not allowing the spring under it to move it back and forth properly resulting in the wavy look. I'm not sure how that would have caused the grey halftone though. You have one heck of a mystery on your hands here, hopefully you can figure it out and get it resolved in the one trip.

Our company is in the same situation where we have customers spread out all over a huge area. There are a lot of local businesses, but there are many that are 40, 50, and 60 miles away. Some are even a bit over 100 miles away. It makes for a lot of travel.

[tsbservice]

yeah seeing as the same pattern is repeated across all colours in the same area, it definitely looks like something is up with the belt and i would say it needs a black drum as well.

This...it was.

[tsbservice]

ITB and K drum were shot, evidence nowhere found.
Belt waste analyzed, black developer unit in perfect condition. Finally it looked like something inside ITB drive roller was working against belt and consecutive black drum as it's always pressed against ITB. Gotta love this job!
Thanks everyone ?