Konica Minolta (bizhub C364) white line problem

[Jezzzz]

I have encountered this problem, before I printed 3,000 (2-sided) copies of flyers. After that, we checked the output through an administrative test for gradation. I found out it has a white line in Cyan, Magenta, and the worst one in the Black. I checked the Transfer Belt, and it's all good.

Thanks in advance.

[copytechtrouble]

have you cleaned the laser unit? what's the life on the drum and dev units?

[Zesti]

What paper size is used and which direction. I beleive its transfer belt. Your K dv unit also needes replacement.

[Jezzzz]

have you cleaned the laser unit? what's the life on the drum and dev units?

I clean with a cleaning stick included in the machine, and after that, I try it. It reduces the white lines. Should I disassemble the whole machine to clean the glass, and should i use a solution to clean it?

I recently used this method on the development unit. https://streamable.com/gtux2h same output result persists. The drum unit (K) exhibits a black line, while the Magenta and Cyan units show a small toner stain. Should I clean this?

Thanks for helping.

[Jezzzz]

What paper size is used and which direction. I beleive its transfer belt. Your K dv unit also needes replacement.

Size : 12in x 18in
Orientation : Landscape

and here's the status of the transfer belt https://streamable.com/w465am

Thanks for helping.

[rrrohan]

its about 15 min job to remove Laser/Print Head and being able to clean it with a cloth is so much better than a wand

i never use product as it should only be toner/dev so wiping with cloth is enough

black looks like it needs a new dev unit

[Don N.]

You could try cleaning the mag roller on the K dv unit with a dry lint free cloth. Developer is available to dump it and replace IF THE UNIT HAS A LOW PAGE COUNT, but its not that expensive to just replace the whole dv512k unit. Did you say how many pages are made on the K dv unit? Also a few lines look like could be the fuser. Can you rub off toner where the worse lines are?
I'm betting your K drum is old. The cleaning blade on your transfer belt could be replaced very cheaply and easily.
You could take the chip from the C drum, which looks the best of all, swap with the k drum chip and test with those two drums swapped. The drums are exactly the same except the chips must be either color or K. Do not just reset the drums with new chips. If the drums spin by hand very easily, the cleaning blades are shot. Old drums do not discharge well. Residual charge will cause uneven copies depending on the densities you are copying. You will end up pulling developer. Lastly, the seals on all of your 4 series dv units are almost certainly allowing dust to coat the charge grids. Unless you do new seals, all of your efforts will be short lived. You need to go full in on fixing all of the above, or just put the money into a newer machine. The 8 series drum charge system is vastly superior.

[kingarthur]

When I remove the laser assy, I normally wipe the glass with a small amount of isopropyl alcohol, but make sure you wipe it with a clean cloth after. However I'd also remove the drum and dev units, to make sure that they aren't dropping dev/toner - maybe replace any of the units over life. Check any filters too. Remove the units with the laser out, or before you remove it - otherwise any loose toner/dev will only fall down onto the nice clean laser

[copytechtrouble]

Size : 12in x 18in
Orientation : Landscape

and here's the status of the transfer belt https://streamable.com/w465am

Thanks for helping.

the belt looks to have lines. remove and clean the blade and empty the waste buildup.

[Ziggy]

What is the count on the transfer roller in the door?

[Zesti]

Size : 12in x 18in
Orientation : Landscape

and here's the status of the transfer belt https://streamable.com/w465am

Thanks for helping.

I can see same lines on belt. The lines are on all colors so PH ubit is out of question. Its either belt or transfer roller.

[blackcat4866]

I'm agreeing with Don. Clearly you've got a black developing issue. At this stage, I think it's not recoverable without replacing the black developing unit. Before you start buying parts, confirm that it's Genuine KM black toner. If it's not, your issue will return soon.

The lesser issue: the white lines in the feed direction can be a secondary transfer issue (roller) or fuser belt ... I suspect both. When a primary transfer belt cleaning issue occurs, it tends to contaminate ALL the laser slit glasses in exactly the same area, but not in a thin line. It's usually a wide spray of toner that's clearly obvious upon examination.

I'll be interested in what you observe. =^..^=

[REGSIS]

I have encountered this problem, before I printed 3,000 (2-sided) copies of flyers. After that, we checked the output through an administrative test for gradation. I found out it has a white line in Cyan, Magenta, and the worst one in the Black. I checked the Transfer Belt, and it's all good.

Thanks in advance.

I would start with new OEM black drum unit, and check output again. That should sort out horizontal lines.
You may need to replace Dev unit K depending on the output. I'm not sure about vertical white lines on all colours. Maybe a transfer belt/roller issue.

Regarding the white lines in general (not from this topic), using some of non OEM toners may dust on charge grid. This will result in white lines on full tone output or line of particular color on white background.
I had this problem also with KM OEM toners labeled S or A which are also aftermarke in fact.
After many drum unit cleaning (problem came back after 200-300 printouts everytime) I ended up with vacuuming toner hopper and replacing new OEM toner, and new Dev unit.

Also had white line without dusted charger. New drum was the solution. There was no visible defect either on drum nor on dev unit. Drum had about 70k.

[Synthohol]

even a small amount of toner/DV in any of the DV unit gears or the coupling in the copier can cause the mag roller to oscillate like an oval and give that impression.
just a thought
hope its that simple.
also your belt is ready to be a doorstop imho.

[ninadobrev]

have you cleaned the laser unit? what's the life on the drum and dev units? Sprunki Mod

Cleaning the laser unit and maintaining components such as the printer drum and developer are important to ensure their performance and prolong their life.