[Misc] Mp 9000 dirty copies, only leading edge

[Codex]

Hello
I have an mp 9000 that starts with dirty copies, than i clean everything... Pcu unit, development unit and cleaning unit and the machine works fine for a while and then the problem comes back, i changed developer last week because it reached the target, changed also cleaning blade... Drum has 500k copies.... See attached pic with the problem uploadfromtaptalk1445614043725.jpg

[jam-o-matic]

Re: Mp 9000 dirty copies, only leading edge

How many total clicks on machine? i have seen the front guide (black plastic with ridges) on the Transfer Unit wear out on these, causing CQ similar to this. If transfer belt is black & waaaay overdue (some techs think you NEVER have to replace!?) I would start there. The guide wear occurs after 1M usually (unless running a lot of thicker paper)

[Codex]

Re: Mp 9000 dirty copies, only leading edge

The machine has 3 million now, but i've already replaced the transfer unit with one from another machine, but the problem is the same, the other machine works fine

[MIKON]

Re: Mp 9000 dirty copies, only leading edge

Have you replaced the toner suction pump?

[allan]

Re: Mp 9000 dirty copies, only leading edge

Does the pattern on the edge look the same every time. If it picks it up from a static part(no moving) the effect should be more or less the same?

It's on every pint and not just the first print?

[andy227]

Re: Mp 9000 dirty copies, only leading edge

Just before the fuser, the charge duct unit with the insulated padding, the lead edge is scraping the underside. Run a cloth or finger on that underside even on the cleanest of machines and it will be covered with toner. Maybe the lead edge is curling upwards more than it should. Also check the underside of the fuser cleaning web cover, they get similarly covered in toner. Its one of those two for sure.
That is NOT a dev, drum, cleaning blade, or toner pump issue.

[Codex]

Re: Mp 9000 dirty copies, only leading edge

I checked the machine yesterday, i saw that tbere was a bit toner dusting inside and the underside of the pcu assy, just after the registration roller was dirty with toner, i cleaned again everything, but after 5k prints the underside of the pcu assy was dirty again, causing the problem on the sheet.... It's not just on the first print, but in every sheet

[Codex]

Re: Mp 9000 dirty copies, only leading edge

Does the pattern on the edge look the same every time. If it picks it up from a static part(no moving) the effect should be more or less the same?

It's on every pint and not just the first print?

The pattern look similar, and it's on every sheet

[Codex]

Re: Mp 9000 dirty copies, only leading edge

Just before the fuser, the charge duct unit with the insulated padding, the lead edge is scraping the underside. Run a cloth or finger on that underside even on the cleanest of machines and it will be covered with toner. Maybe the lead edge is curling upwards more than it should. Also check the underside of the fuser cleaning web cover, they get similarly covered in toner. Its one of those two for sure.
That is NOT a dev, drum, cleaning blade, or toner pump issue.

The problem happens before the fuser unit, i think it,s something in the PCU ASSY, because the underside of the assy gets dirty, Developer, cleaning brush and cleaning blade, corona wires are changed recently

[allan]

Re: Mp 9000 dirty copies, only leading edge

Maybe your developer got over toned while initializing the developer?

[slimslob]

Re: Mp 9000 dirty copies, only leading edge

Check for toner dusting on the bottom of the PCU frame. In the Pro 1357EX this can be a problem when doing a large number of 4 and 6 page booklets with the booklet finisher. Suction pump and bottle needing to be replaced will also cause excessive toner dusting. Also check for toner build up on the frame between the PCU and the fusing unit where the edge of the paper paper can rub against.

[andy227]

Re: Mp 9000 dirty copies, only leading edge

Also check for toner build up on the frame between the PCU and the fusing unit where the edge of the paper paper can rub against.

thats what I am saying but he doesn't say if he checked these areas.

[Codex]

Re: Mp 9000 dirty copies, only leading edge

thats what I am saying but he doesn't say if he checked these areas.

Sorry, yes i checked these areas, but it seems that the toner stuck only at the underside of the PCU unit (aluminium bar) when i open the unit i found toner near the ID sensor, the copy quality is perfect, so no overtoner. I'm going mad with this machine......i changed also toner pump last week (SC 495)......

[Codex]

Re: Mp 9000 dirty copies, only leading edge

Check for toner dusting on the bottom of the PCU frame. In the Pro 1357EX this can be a problem when doing a large number of 4 and 6 page booklets with the booklet finisher. Suction pump and bottle needing to be replaced will also cause excessive toner dusting. Also check for toner build up on the frame between the PCU and the fusing unit where the edge of the paper paper can rub against.

i check the bottle and the suction pump on monday, i found toner dusting inside the machine sometimes

[blazebusiness]

Re: Mp 9000 dirty copies, only leading edge

Hello
I have an mp 9000 that starts with dirty copies, than i clean everything... Pcu unit, development unit and cleaning unit and the machine works fine for a while and then the problem comes back, i changed developer last week because it reached the target, changed also cleaning blade... Drum has 500k copies.... See attached pic with the problem [ATTACH]31054[/ATTACH]

Dirty PCU casing usually points to an issue with the developer(overtoned,bad seals etc....) Start by Replacing the developer(Type 27w).But I have also seen issues like that and replacing the cleaning unit brush roller as well as the drum cleaning blade have helped. I see you have already replaced the blade......but did you replace the brush roller? The main charge corona grid for that model is super cheap and with copy quality issues I would replace it also (part #B234-2113)...........

If that does not help......focus on the transfer assembly or developer unit for those dirty prints.