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

[Codex]

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

Thanks for the headsup....

You're talking about a Hydroscopic moisture type of effect . Given the warmth of the machine and cooling down at night
its an interesting probability.

Re. Drum Sweat Burn, Light Burn or Arc burn.
Wouldn't the smudge/blurb be a static constant and the exact same pattern on the drum every time for each copy?

It's interesting in that the blurb on the copy comes and goes over time with some type of regularity.

I wonder if they run a lot of labels or foils through the machine. It may account for aluminium or glue around the drum ?

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Like a well oiled TV soap opera, I'm waiting for the next exciting episode of this thread so I can find out what the fault was...

I've seen a lot of moisture in some machines... MPC2050, MP3350... but in the Mp9000 only around the duplex unit... The customer didn't use foil or labels... They print only on normal paper

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[Codex]

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

interesting phenomena!
Why was there no charge at that particular place at that particular time?
1. something came between drum and charge (piece of paper?) => unlikely
2. charge went away due to power supply unit or power pack failure. => possible
3. in wich conditions is the machine standing? In a normal office? What is temperature overnight?
What is the exact time when the dot is printed? Perhaps another big machine in the factory is than put to on...?

The machine is in a copyshop....

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[Mark Bbb]

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

The machine is in a copyshop....

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Perhaps there is something wrong at one particular time in the electrical circuit of the copyshop.
Bu than it would occur with other machines too.
It would be nice if customer take note exact when the problem occurs and which other machines are (put to) on or put to work.

I have had this a few times and it was always a piece of paper somewhere between this and that...

[mikadonovan]

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

I just remembered an issue I had with a C7501 years ago. The machine was experiencing similar quality issues, and it was due to a gigantic ghost turd floating around in the cavity area directly above the charger assembly. Replacing the charger did not help the issue, but removing the dust/hair ball fixed it.

[slimslob]

[NeoMatrix]

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

I just remembered an issue I had with a C7501 years ago. The machine was experiencing similar quality issues, and it was due to a gigantic ghost turd floating around in the cavity area directly above the charger assembly. Replacing the charger did not help the issue, but removing the dust/hair ball fixed it.

Looking at the original scanned images posted to the forum: the halo(antialias) affect around the smudge lends me to believe it's and optics fault. Antialias would make it an A-to-D digital fault.
I would be inclined to search for a fluff ball (gecko, cockroach) floating around in the optics, but Codex has stated that the blurb also occurs on prints, which therefore rules out the optics.

Codex stated he's also said he's seen moisture in the machine, but only in the duplexer. Which has me leaning towards what Lagonda said.

[fadsamniote]

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

I want to see the real technical solving this issue

[Lagonda]

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

Having had a second look at Codex's samples I've suddenly realised its the same C/Q problem we used to get on the MP C4500 AP C1 range.
When autumn arrived each year and if the temperature dropped over the weekend we'd be flooded on Monday mornings with calls for copy quality. Copiers with drums that were about at 75% of their life just didn't like a sudden drop in temp and humidity. Usually by the time the tech got there at mid day everything had warmed up and the drums behaved themselves and the black mark had vanished but next morning it happened again. The only fix, a new set of drums.
Since Europe is now heading into autumn it could be a possibility.

[NeoMatrix]

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

Having had a second look at Codex's samples I've suddenly realised its the same C/Q problem we used to get on the MP C4500 AP C1 range.
When autumn arrived each year and if the temperature dropped over the weekend we'd be flooded on Monday mornings with calls for copy quality. Copiers with drums that were about at 75% of their life just didn't like a sudden drop in temp and humidity. Usually by the time the tech got there at mid day everything had warmed up and the drums behaved themselves and the black mark had vanished but next morning it happened again. The only fix, a new set of drums.
Since Europe is now heading into autumn it could be a possibility.

Re. Sudden cold snap in the weather.
Yes I know what you are saying. The cold snap in the weather causes the edge of the old drum blade to harden and not clean properly until the machine warms up.
I've seen that on the old MP C4500 series a few times. Had to convince the boss not to throw out 3/4 life span PCU's just because of a cold snap.

[Lagonda]

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

Re. Sudden cold snap in the weather.
Yes I know what you are saying. The cold snap in the weather causes the edge of the old drum blade to harden and not clean properly until the machine warms up.
I've seen that on the old MP C4500 series a few times. Had to convince the boss not to throw out 3/4 life span PCU's just because of a cold snap.

Sorry Neo but I have to disagree with you there, the cleaning blade isn't the problem, it's the drum surface not charging and discharging correctly.

[Mark Bbb]

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

Plus one with that one.
My unproven theory is that it is caused by change of temperature and humidity over night while the drum sits in one place with a poor air flow over its surface. The straight line is caused by the cleaning blade blocking the air flow. We see the same often on copiers with drums nearing the end of their life, usually as a blurred patch that comes and goes and occasionally a dark patch like yours.
The only remedy is a new drum and filters then change the filters when they should be changed at every PM around 300k.

Well, how big is the fluctuation of the temperatire in the copyshop?

[trc]

[luca72]

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....

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Try cleaning / scraping the corona wires gently with a flat-head screwdriver to remove the hardened toner + clean / replace the air filter near the corona c. unit ... and while you're at it clean the main filters as well ... clean / scratch the first 15 centimeters of the drum axis (where the internal contacts of the drum rest) to improve grounding, good work

[Codex]

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

Well, how big is the fluctuation of the temperatire in the copyshop?

About 10-15 degrees Celsius

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[Codex]

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

Since i opened this thread there was no problem on this machine..... It's more then a week now

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