[Misc] konicaminolta c3070L

[chughtai]

hi
expert's for konicaminolta i have a problem for accurio C3070L for banding for 100 to 300GMS paper and cards i did every thing according to service manual.
i adjust fuser speed and change fuser unit and transfer unit assy but not solve problem i also swap drum unit to other machine but problem
still same. i attach print photo sample. plz kindly give me your advoice
if any one face this problem plz help me to find out this problem.

thanks.

[blackcat4866]

Re: konicaminolta c3070L

Are you setting the correct media type for your media?

[chughtai]

Re: konicaminolta c3070L

Are you setting the correct media type for your media?

yes i have art card and balech card and matte paper 100gms but still same problem

[blackcat4866]

Re: konicaminolta c3070L

There are a number of defects in these images. Can you please mark which defect you are concerned about, and which direct that the paper fed? =^..^=

[Synthohol]

Re: konicaminolta c3070L

swap corona units and see if it follows them since a drum swap did nothing right?

[chughtai]

Re: konicaminolta c3070L

There are a number of defects in these images. Can you please mark which defect you are concerned about, and which direct that the paper fed? =^..^=

left sarrow for feeding side

[Synthohol]

Re: konicaminolta c3070L

what are the consumable counters at?

[blackcat4866]

Re: konicaminolta c3070L

Thanks for marking up the images. So the defects are crossfeed? Does it affect CMY images also? Does the defect change?

I think that I would start with the black drum. We've had new drum units in which the rear drum bore is milled to small, so the drum does not insert properly when you slide the drawer shut. To test out this hypothesis, remove the transfer belt assy, and all the drums and developing units, then insert just that single drum unit into it's spot. Then slowly slide the imaging drawer in to confirm that it closes smoothly, all the way, so the front frames touch. Lubrication does not seem to help this issue. I used a rat-tail file to open up the rear bore, just enough to allow the drum to fully insert.

The black developing unit could be difficult to turn also. I've also had the transfer belt unit bearings seize up at high count. =^..^=

[Ziggy]

Re: konicaminolta c3070L

If only the black is doing this
To test and see if the black dev unit is problem you and swap the black and one of the color dev units (ex. Cyan). Just be sure to put scotch tape over the hole where toner goes in to the developer unit on each unit. Then boot straight into service mode and run 1 cyan test chart at 128 density it will come out black because of swap. if it still has bans then you have a bad black developer unit. Only run 1 print to test if you run a lot it will make a mess due to toner trying to add.

[Synthohol]

Re: konicaminolta c3070L

if you leave the toner door open it wont try to add toner during testing like described above.

[Ziggy]

Re: konicaminolta c3070L

if you leave the toner door open it wont try to add toner during testing like described above.

I've never tried it that way, that is a good idea. But wouldn't you still get a small amount of toner drop in the developer unit when you pushed them in?

[blackcat4866]

Re: konicaminolta c3070L

If only the black is doing this
To test and see if the black dev unit is problem you and swap the black and one of the color dev units (ex. Cyan). Just be sure to put scotch tape over the hole where toner goes in to the developer unit on each unit. Then boot straight into service mode and run 1 cyan test chart at 128 density it will come out black because of swap. if it still has bans then you have a bad black developer unit. Only run 1 print to test if you run a lot it will make a mess due to toner trying to add.

I've never tried it that way, that is a good idea. But wouldn't you still get a small amount of toner drop in the developer unit when you pushed them in?

That's what the tape is for. the toner cannot pass through the tape. =^..^=

[chughtai]

Re: konicaminolta c3070L

Thanks for marking up the images. So the defects are crossfeed? Does it affect CMY images also? Does the defect change?

I think that I would start with the black drum. We've had new drum units in which the rear drum bore is milled to small, so the drum does not insert properly when you slide the drawer shut. To test out this hypothesis, remove the transfer belt assy, and all the drums and developing units, then insert just that single drum unit into it's spot. Then slowly slide the imaging drawer in to confirm that it closes smoothly, all the way, so the front frames touch. Lubrication does not seem to help this issue. I used a rat-tail file to open up the rear bore, just enough to allow the drum to fully insert.

The black developing unit could be difficult to turn also. I've also had the transfer belt unit bearings seize up at high count. =^..^=

thanks for you response i have to machine in same location i swap machine-1 all drums, developre unit, charger assy and transfer belt unit other machine-2 but machine to working wil machine-1 still same issu not only black all color CMYK i am only upload black image.

what you think it possible for high voltage unit?

machine-2 part still new only 168k prints.

thank's

[blackcat4866]

Re: konicaminolta c3070L

thanks for you response i have to machine in same location i swap machine-1 all drums, developre unit, charger assy and transfer belt unit other machine-2 but machine to working wil machine-1 still same issu not only black all color CMYK i am only upload black image.

what you think it possible for high voltage unit?

machine-2 part still new only 168k prints.

thank's

Just to clarify:
You have two machines in the same location, so you have swapped all drums, all developing units, primary charge units, and transfer belt between machine-1 and machine-2.

I am not sure which machine had the problem initially, machine-1 or machine-2, but the problem remains with the original machine after all consumables swapped.

You only provided samples of black, but the issue affects all colors.

Do I think the HVT is likely? No.
Do I think a laser unit is likely? No, there are four separate laser units, and it's unlikely that you would find four defective laser units at once.

What would I do?
I think I would start by doing a power quality analysis. How clean is the wall power?
I would use 13 x 19 original size and print single color image samples, then emergency stop the machine, to determine if you see the defect:
1) on the drum
2) on the primary transfer belt, after primary transfer and before second transfer
3) on the paper, after second transfer and before fusing

In this way you can determine at which stage the image is affected. Would you like original images? See attached: =^..^=

[Todd Glenn]

Re: konicaminolta c3070L

Is the second transfer roller making contact with the electrode?