Mp 9000 random smudge... I'm gone mad!

[Codex]

Hello guys
I have an Mp9000 thats driving me crazy... It seems the machine is possesed by the devil. Randomly a smudge appears on the first copies /prints.... Ever on the same height on the sheet but not on the same place, then after two or three xopies/prints the smudge disappears for days or sometimes for weeks..... I've swapped the following from a working machine : drum, cleaning assy, development unit, pcu frame, laser diode, polygon motor, transfer unit...... But the problem still occurs....

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[dave w]

Re: Mp 9000 random smudge... I'm gone mad!

Have you looked at the Transfer Belt?

[mikadonovan]

Re: Mp 9000 random smudge... I'm gone mad!

You might try a new charge assembly, kinda looks like a charge problem and you didnt say you replaced it. It doesn't look like a fusing issue,either.

[slimslob]

Re: Mp 9000 random smudge... I'm gone mad!

For as lomg as I can remember, black smudges on the first copy are an indication that it is far beyond PCU PM. A spot on the drum is not properly taking a charge. By the second page there is sufficient charge buildup. Include a new drum when you do the PM.

[Phil B.]

Re: Mp 9000 random smudge... I'm gone mad!

Hello guys
I have an Mp9000 thats driving me crazy... It seems the machine is possesed by the devil. Randomly a smudge appears on the first copies /prints.... Ever on the same height on the sheet but not on the same place, then after two or three xopies/prints the smudge disappears for days or sometimes for weeks..... I've swapped the following from a working machine : drum, cleaning assy, development unit, pcu frame, laser diode, polygon motor, transfer unit...... But the problem still occurs....

Inviato dal mio SM-G935F utilizzando Tapatalk

Why do people make this job harder than they need to?
you swapped all those parts and NOT the FUSER? think about WHAT put toner on the page or BONDS it to the page!

[JDYAL]

Re: Mp 9000 random smudge... I'm gone mad!

I'm with Mika looks like a charge problem. I see this on wide format when the charge corona starts to go, and its intermittent.

[eccelobo]

Re: Mp 9000 random smudge... I'm gone mad!

X3 charge corona. It happened to me.

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[Codex]

Re: Mp 9000 random smudge... I'm gone mad!

I swapped both charge assys from a working machine.... Still the same problem after a week...... I'm sure it's not a fuser problem

Inviato dal mio SM-G935F utilizzando Tapatalk

[Codex]

Re: Mp 9000 random smudge... I'm gone mad!

Why do people make this job harder than they need to?
you swapped all those parts and NOT the FUSER? think about WHAT put toner on the page or BONDS it to the page!

I'm sure its not a fuser problem

Inviato dal mio SM-G935F utilizzando Tapatalk

[Codex]

Re: Mp 9000 random smudge... I'm gone mad!

I'm sure its not a fuser problem

Inviato dal mio SM-G935F utilizzando Tapatalk

It looks lime some electrical discharge

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[Codex]

Re: Mp 9000 random smudge... I'm gone mad!

For as lomg as I can remember, black smudges on the first copy are an indication that it is far beyond PCU PM. A spot on the drum is not properly taking a charge. By the second page there is sufficient charge buildup. Include a new drum when you do the PM.

I changed the drum from a working machine... But still the same problem

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[slimslob]

Re: Mp 9000 random smudge... I'm gone mad!

I swapped both charge assys from a working machine.... Still the same problem after a week...... I'm sure it's not a fuser problem

Inviato dal mio SM-G935F utilizzando Tapatalk

Quit f***ing swapping parts and start replacing with new. I would include the connector for the corona and the HVPS.

[slimslob]

Re: Mp 9000 random smudge... I'm gone mad!

I changed the drum from a working machine... But still the same problem

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What part of new do you not understand.

[JDYAL]

Re: Mp 9000 random smudge... I'm gone mad!

Check the power packs- ppg ang cgb

[NeoMatrix]

Re: Mp 9000 random smudge... I'm gone mad!

Does the smudge appear when coping through the ADF only ,off the platen glass only , print only?

Do you have an sample copy for the different times the problem occurred?
Lets say a sample of the fault for Monday, and a sample of the fault for Friday.
Can you overlay the sample copies one on top of the other, hold them up to the light; is the fault blurb an exact match ?
If the blurbs are an exact match you can rule out insects or rodents moving around in the optics.

I would lean toward quenching lamps/laser.
Maybe paper dust build up behind the rego roller???

The above might jog a light bulb in someone.