Konica Minolta Bizhub C6500 – Vertical Black Lines Issue

[Orl]

Hi everyone,

I’m having trouble with vertical black lines appearing across the direction of the print on my Konica Minolta Bizhub C6500. I’ve done quite a bit of cleaning and checking, but I still can’t figure out the root cause.

What I’ve already tried:

• Cleaned the transfer belt cleaning blade thoroughly
• Checked the entire paper path for debris or marks
• Inspected the developer units for toner build-up or mechanical issues

Unfortunately, the lines persist. I’m attaching a photo to show exactly what they look like.
Has anyone experienced this issue before or can suggest what else I should check?

Thanks in advance for any help or ideas!

[Black Cloud]

I'd check the drum units for cut lines.

[kenpio]

Kind of looks like the transfer belt itself. That is an old box. It would be hard to get the belt and cleaning blade for it.