Bizhub C250i prints are speckled with all colors

[occus]

Hello, has anyone ever seen a print pattern like this?


20240125_155753_resized.jpg20240125_155732_resized.jpg
The device is about 4 years old and has 60k black and 80k color on counter. The whole print is full of dots. The drums still have 47%.


The only solution was to replace the drums. Really strange all drums to the same time...
The repair was 2 weeks ago and now I have exactly the same problem again on another C250i that I still have to go over. Counter black 77k and color 80k and is 3 years old.


What are your opinions on this?

[KMFLT3CH]

Re: Bizhub C250i prints are speckled with all colors

HV Board.

https://www.copytechnet.com/forums/konica-minolta/173224-background-i-series.html#post2343917

I've come across this a few times now, the primary cause is non-genuine toner. Haven't had a call back on any of them after replacing the board. Sometimes the damage is severe enough to where you need to replace the dev units and drums as well, and obviously switch back to genuine toner.

[occus]

Re: Bizhub C250i prints are speckled with all colors

Hi KMFLT3CH

Thank you for reply. In my case we use only orignal toner and the drum replacement has fixed the problem.

You wrote you have "reseated every connector I could find, replaced the IDC sensors, drums and belt were new, gradation, you name it. Finally replaced the High Voltage board and that fixed it."
That means in your case the drum replacement has not fixed the problem? Did you do the test with used drums or taken new drums with chip initialization?


Now I'm not sure which solution would be better... replacing drums that are at 80K and then having new ones in them or replacing the HV board, which is much cheaper...

[KMFLT3CH]

Re: Bizhub C250i prints are speckled with all colors

Hi KMFLT3CH

Thank you for reply. In my case we use only orignal toner and the drum replacement has fixed the problem.

You wrote you have "reseated every connector I could find, replaced the IDC sensors, drums and belt were new, gradation, you name it. Finally replaced the High Voltage board and that fixed it."
That means in your case the drum replacement has not fixed the problem? Did you do the test with used drums or taken new drums with chip initialization?


Now I'm not sure which solution would be better... replacing drums that are at 80K and then having new ones in them or replacing the HV board, which is much cheaper...

Replacing the drums cleaned up the prints a little, however some faint speckling was still evident. By the time I had returned with the HV board, the problem was just as bad as before. All 4 drums were brand new out of the box.

[HoonBoy]

Re: Bizhub C250i prints are speckled with all colors

Hello, has anyone ever seen a print pattern like this?


[ATTACH=CONFIG]61304[/ATTACH][ATTACH=CONFIG]61305[/ATTACH]
The device is about 4 years old and has 60k black and 80k color on counter. The whole print is full of dots. The drums still have 47%.


The only solution was to replace the drums. Really strange all drums to the same time...
The repair was 2 weeks ago and now I have exactly the same problem again on another C250i that I still have to go over. Counter black 77k and color 80k and is 3 years old.


What are your opinions on this?

Hi, we had a few of these cases in a short while as well. Everytime the drum life is still about 50% as well and drums all look fine. First time we replaced all drums(CMYK) as well.
We did find a cheaper solution... Just resetting the drums solved our problems allready 3 times this week.


The voltage of charging AC Output and LD light make a huge jump up after reset, and have values compared with a machine with no problems and simular life/counter.

[4Toon]

Re: Bizhub C250i prints are speckled with all colors

Imaging Process Adj --> Pg. 2 Transfer Volt Fine Adj. //////Do some changes in here should fix your issues. quality issues could come back once weather changes again just to be aware of for the future on MFP with this issue. I have MFP's that I go to at min. 2 times a year to change this when the weather changes.

[Gift]

Re: Bizhub C250i prints are speckled with all colors

I've seen this on the C308 serie, too when the voltages are out of the usual range. I'd take a look at the voltage display first in service mode. Resetting drums will reset some voltages too but depending on the actual condition of the drum trying this can end up in even worse print quality,

[occus]

Re: Bizhub C250i prints are speckled with all colors

Hi, we had a few of these cases in a short while as well. Everytime the drum life is still about 50% as well and drums all look fine. First time we replaced all drums(CMYK) as well.
We did find a cheaper solution... Just resetting the drums solved our problems allready 3 times this week.


The voltage of charging AC Output and LD light make a huge jump up after reset, and have values compared with a machine with no problems and simular life/counter.

Hi Hoonboy
What do you mean with resetting? Just Drum pull out and put in? Or you reset the values with initialisation/stabilisation or you make a drum life reset with a new chip?

This week 3 times? always the same device?

[occus]

Re: Bizhub C250i prints are speckled with all colors

I now had the problem on 3 other devices. As suggested and because others had success with it, I replaced the HV board but unfortunately without success. That's why I looked for a different solution for the other 2 devices.
Stabilyzer and gradation adjust only have a minimal effect.

Since I successfully replaced the drums on the first machine, I wondered whether it had an impact when a new drum chip was detected.
Thought and done and now the devices print perfectly again without a background. I find that unbelievable... what did they implement?! intentional or unintentional, you don't know.

But now go to official support and discuss about aftermarket chips... not possible.

[HoonBoy]

Re: Bizhub C250i prints are speckled with all colors

Hi Hoonboy
What do you mean with resetting? Just Drum pull out and put in? Or you reset the values with initialisation/stabilisation or you make a drum life reset with a new chip?

This week 3 times? always the same device?

Little late reply, missed ealier notification... We had this problem on 3 different machines in one week time , my guess is that the weather had a big impact.
Had this once before and replaced all drums, even though they looked fine.. Replacing fixed the problem.

The next machines we had this on, we did not replace the drums, but only reset the lifecounter of the drums (chips will do, or be creative).
Attached an example of the most extreme machine. Just resetting the drums fixed this...

P.s. Yes the fuser did need replacement.

[tsbservice]

Re: Bizhub C250i prints are speckled with all colors

Hello, has anyone ever seen a print pattern like this?


[ATTACH=CONFIG]61304[/ATTACH][ATTACH=CONFIG]61305[/ATTACH]
The device is about 4 years old and has 60k black and 80k color on counter. The whole print is full of dots. The drums still have 47%.


The only solution was to replace the drums. Really strange all drums to the same time...
The repair was 2 weeks ago and now I have exactly the same problem again on another C250i that I still have to go over. Counter black 77k and color 80k and is 3 years old.


What are your opinions on this?

On those 2 machines both K drums are really at around 150k counts.
And drive count matters also they've look doing a lot of color job vs monochrome.
Did you do first new K drum and wait a bit probably few hundred pages for machine to settles down itself.

[occus]

Re: Bizhub C250i prints are speckled with all colors

I now had the problem on 3 other devices. As suggested and because others had success with it, I replaced the HV board but unfortunately without success. That's why I looked for a different solution for the other 2 devices.
Stabilyzer and gradation adjust only have a minimal effect.

Since I successfully replaced the drums on the first machine, I wondered whether it had an impact when a new drum chip was detected.
Thought and done and now the devices print perfectly again without a background. I find that unbelievable... what did they implement?! intentional or unintentional, you don't know.

But now go to official support and discuss about aftermarket chips... not possible.

Your print pattern looks completely different than mine. I haven't seen that on my devices yet.

On those 2 machines both K drums are really at around 150k counts.
And drive count matters also they've look doing a lot of color job vs monochrome.
Did you do first new K drum and wait a bit probably few hundred pages for machine to settles down itself.

Maybe my description was a bit crude. There are only colored dots on the print and no black so i have only changed CMY drums. The black drum was replaced much earlier because it was regulary worn out.

[tsbservice]

Re: Bizhub C250i prints are speckled with all colors

Your print pattern looks completely different than mine. I haven't seen that on my devices yet.



Maybe my description was a bit crude. There are only colored dots on the print and no black so i have only changed CMY drums. The black drum was replaced much earlier because it was regulary worn out.

Conclusion - not for heavy duty users or they're destroying themselves.
Again it's what your sales force sell the customers. Blame them always!