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  1. #21
    Just a tech 100+ Posts keithxxiii's Avatar
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    Re: Mp 9000 random smudge... I'm gone mad!

    Although we can say it is an electrical problem, probably from the charge, do not discount the dirt that is stuck from the web assembly. Poor cleaning on the unit may cause the build up on the cover when paper jam occurs.

    Aye! Cut the crap

  2. #22
    Senior Tech. 2,500+ Posts NeoMatrix's Avatar
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    Re: Mp 9000 random smudge... I'm gone mad!

    Quote Originally Posted by Codex View Post
    The smudge appear in print and copy, it's ever on the same "line", but not on the same place, if i overlay two sheets the blurb doesn't match. If you look the fotos there are taken at different days

    Inviato dal mio SM-G935F utilizzando Tapatalk
    Gecko or cockroach in the optics....

    Swat the little sod...

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    Dunno with the print side of it....

    What happens when you run a 100 pure blank(white) copies or prints ?
    Does the blurb enlarge or reduce when you size up or size down ?
    Any difference with a double patterned blurb/smudge when using A3 paper ?

    What if we could count the stars... , what number would you stop at...?"
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  3. #23
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    Mp 9000 random smudge... I'm gone mad!

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

    It is very similar to the kind of smudge produced by sunlight over the drum. I know it's almost impossible, but could it be that some light is getting through to the drum?

    Enviado desde mi SM-G920V mediante Tapatalk


  4. #24
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    Re: Mp 9000 random smudge... I'm gone mad!

    I have definalty seen this before and I will look for my notes but iam thinking it was the transfer belt unit.


  5. #25
    Senior Tech 250+ Posts Codex's Avatar
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    Re: Mp 9000 random smudge... I'm gone mad!

    Quote Originally Posted by eccelobo View Post
    It is very similar to the kind of smudge produced by sunlight over the drum. I know it's almost impossible, but could it be that some light is getting through to the drum?

    Enviado desde mi SM-G920V mediante Tapatalk
    The machine is in a very dark environment... My idea was some kind of flash or light caused by a spark i side the machine... But i have no proof of this

    Inviato dal mio SM-G935F utilizzando Tapatalk

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  6. #26
    Field Supervisor 500+ Posts Bantams's Avatar
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    Re: Mp 9000 random smudge... I'm gone mad!

    Could be condensation on the drum due to blocked or completely over pm ozone filters


  7. #27
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    Mp 9000 random smudge... I'm gone mad!

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

    Could be cause by an arc of electricity near the corona block. That would explain the straight edge of the blob. I would pull the power packs and check the connectors. A small crack in these connectors can cause arcs.


  8. #28
    Service Manager 1,000+ Posts
    Mp 9000 random smudge... I'm gone mad!

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

    Quote Originally Posted by Bantams View Post
    Could be condensation on the drum due to blocked or completely over pm ozone filters
    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.

    At least 50% of IT is a solution looking for a problem.

  9. #29
    Senior Tech. 2,500+ Posts NeoMatrix's Avatar
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    Re: Mp 9000 random smudge... I'm gone mad!

    Quote Originally Posted by Lagonda View Post
    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.
    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...

    What if we could count the stars... , what number would you stop at...?"
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  10. #30
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    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...?


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