MX6070N blk pulling developer

[bilyahn]

I checked this post out. https://www.copytechnet.com/forums/s...9=#post1678624

Not quite the same as ours. We have a MX6070 that is pulling developer on a regular basis. The time frame varies from a couple of months to a week or so. Machine has 198K black and 312K color,
firmware is current. Not having issues with the color drums just black.

Have replaced process unit, developer unit and primary transfer belt (some several times). All of sim 8-1, 8-2 and 8-6 are correct. Charge does not get contaminated normally, it will pull developer by having an excess amount on the drum towards the rear frame and dumping it into the waste container which fills up abnormally fast. All grounds appear to be good. Here is a picture of what the drum looks like

20210319_092659.jpg

If you feel the drum you can tell there is a lot of DV material.

Thank you in advance for your time and effort in this matter.

Bil

[blackcat4866]

Re: MX6070N blk pulling developer

I'll assume that you're new process unit has a new primary charge in it. If I saw this issue, I would assume that the primary charge unit is unevenly positioned too close to the drum on the side that's pulling developer. Corona, needle electrode, or roller primary charge? =^..^=

[bilyahn]

Re: MX6070N blk pulling developer

I'll assume that you're new process unit has a new primary charge in it. If I saw this issue, I would assume that the primary charge unit is unevenly positioned too close to the drum on the side that's pulling developer. Corona, needle electrode, or roller primary charge? =^..^=

Yes, new drum and charge in each instance. Sawtooth corona I guess you would call it. It has occurred pretty much that same with both process units. Maybe we need to check to see if there is a modified/upgraded unit and make sure we have the correct one. Not much I can do about the positioning of the charge unit, it slides in from the front but I will check to see if there is a problem with it's positioning. I would think that the charge would get contaminated if this was the problem? I should mention that I have swapped process units with color ones and the problem doesn't follow the drum, it is specific to black.

Thank you for the response

Bil

[copiertec]

Re: MX6070N blk pulling developer

Have you replaced the BLACK Developing unit with the latest updated one (DUNT-9290DS36)? There were a ton of updates on it. All so make sure the doctor blade cover is installed correctly, so the pins on either end of the cover are seated properly and the doctor blade cover is flush with the developing unit frame.

[bilyahn]

Re: MX6070N blk pulling developer

Have you replaced the BLACK Developing unit with the latest updated one (DUNT-9290DS36)? There were a ton of updates on it. All so make sure the doctor blade cover is installed correctly, so the pins on either end of the cover are seated properly and the doctor blade cover is flush with the developing unit frame.

I believe it is but we have swapped out so many developer units in the last couple of years I am not 100% sure. Cover is flush as far as I can tell snaps into place without having to be forced and looks good.

Bil

[copiertec]

Re: MX6070N blk pulling developer

I believe it is but we have swapped out so many developer units in the last couple of years I am not 100% sure. Cover is flush as far as I can tell snaps into place without having to be forced and looks good.

Bil

Just to make sure, you can pull out the developing unit and I believe the P/N is located to the left.

[EasyRider]

Re: MX6070N blk pulling developer

Because Sharp keeps changing the part numbers so often on these DV box and DV units, see Bulletin CCE-2305 dated April 2021 for the current part numbers. (as of this writing)

[mommok]

Re: MX6070N blk pulling developer

had a simular issue, ended up replacing dv unit, drum unit and hc pwb. problem hasnt returned

[kdr363]

Re: MX6070N blk pulling developer

Try executing sim 5-4 without drum and dv units installed to check the discharge lamps. It is very tiny in size and often gets dusted with toner and greatly reduces the led output. If bad dirty, it will pull dv.

[tsbservice]

Re: MX6070N blk pulling developer

Try executing sim 5-4 without drum and dv units installed to check the discharge lamps. It is very tiny in size and often gets dusted with toner and greatly reduces the led output. If bad dirty, it will pull dv.

I don't do Sharp but this sounds more than possible. Parts of drum surface will be constantly overcharged due to bad discharge thus pulling developer along with toner. Fortunately in all brands very rare cases nowadays.

[Prints Charming]

Re: MX6070N blk pulling developer

Black Discharge Lamp Scattering Prevention Sheet is most likely damaged or not installed correctly.

[bilyahn]

Re: MX6070N blk pulling developer

Thank you everyone for your responses. I am going back today with a lot of things to check! LOL Will let you know what I find

Have a great day

Bil

[bilyahn]

Re: MX6070N blk pulling developer

So everything looked good yesterday when I went back and there was no buildup on the drum as I showed earlier. All I did earlier in the week was a good cleaning of the rear of the unit and made sure the blanking lamp was clean. Did not see anything to protect the lamp from toner dusting. I will have to look for the modification and get that installed.

Have a great day

Bil

[Craigcul]

Re: MX6070N blk pulling developer

Hi there what i have seen on these Cr4 colour machines is that the filter on the front right hand side of the under the side door gets cloged causing the toner to puff out of the dev boxes causing a toner buildup on the drum as well vacum this filter and remove and vacum the dv box filters as well that should stop the toner puffing.


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[hellcat]

Re: MX6070N blk pulling developer

I had this happen on multiple colors on this model

turns out it was the tube unit from the toner to the dv (apparently from what our local sharp DM says) they have a milar inside that causes condensation and can cause the dv to clump thus making it pull extra developer.