Question about Konica Minolta bizhub 250 All-In-One Laser Printer

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Transfer roller assy is wearing out drums on rear side

Getting 7k to 10k out of a drum before the white plastic spacers on the transfer roller assembly cut into the drum surface

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You need to replace the two collars that lays on the left and right of the magnetic roller.

Reset your Toners and Imaging units for Minolta Bizhub and CF series.
http://www.chipreset.eu

Posted on Sep 03, 2009

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Below the drum is an assy. that houses two very fine gold plated wires that do two things since the paper goes between these two wires and the drum the first is transfers the image on to the paper from the drum, the second one prevent the paper from sticking to the drum. One is or both are bad, BROKEN? Remove the assy. and replace both. They are very fine and fragile do not lose the springs. If that does not work you might have bad ends on the assy. after a while the plastic breakdowns and allow the voltage to go to ground. The wire carry around 2000 volts during the copy process. None during power off :) Open close the front door resets the code.
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Dear
It is due to the consumable problem check the following
1- check the drum life> if possible clean the PCR roller with isopropyle alcohol, clean the drum blade.
2- detach the developer assy. and turn the mag roller to check the even flowing of toner, if you are experience clen the doc. blade and roller bushes of the developer assy.
3- check the transfer roller and its contact points clean it with soft anti static brush.
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As per your statement the image formation on drum is ok but prints partial on paper.

The image from the drum is picked by ITB (Inter Transfer Belt) which is a thin plastic like material and the paper passes in between the transfer roller and ITB.
If the ITB unit is not properly aligned to the transfer roller or to the drum the problem will occur as you mentioned. Also check the transfer roller and it contact path.
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Directly below the drum section is an assemble called the transfer/separation assy. the purpose of this unit is twofold. (It houses to very thin gold plated wires) One wire is what helps the transfer of the image from the drum to the paper. Since the paper goes between this wire and the drum, the second wire prevents the paper from sticking to the drum during the transfer process. The code you have been getting means either wires might be broken, or has to cleaned (because of all the toner on it from the drum assy. which needs to be removed and cleaned. Or two white end blocks that hold the wires are getting old and allowing the High Voltage that is applied to the wire during the copy/print process to leak to ground. Open and close the front door to clear. If it comes back have a qualified tech look at it.

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The Transfer separation assy. Located below the drum has two fine wires in side of it that apply several thousand volts to the paper as it goes above the wires and below the drum to transfer image on to paper the second wire prevents the paper from sticking to the drum. Remove assy. see if they are broken or then the end blocks (white) need to be replaced because after a while the plastic breaks down an the High Voltage go thru the plastic to ground. Clean the wire very, very carefully with pencil earser if never been replace go to the web site below for corona wires don't lose those small springs at one end.

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Below the drum is assy. that houses two very fine gold plated wires that do two things since the paper goes between these two wires and the drum the first is transfers the image on to the paper from the drum, the second one prevent the paper from sticking to the drum. One is or both are bad, BROKEN? Remove the assy. and replace both. They are very fine and fragile do not lose the springs. If that does not work you might have bad ends on the assy. after a while the plastic breakdowns and allow the voltage to go to ground. The wire carry around 2000 volts during the copy process. None during power off :) Open close the front door resets the code. if need new wire chk this web site



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Below the drum is an assy. that houses two very fine gold plated wires that do two things since the paper goes between these two wires and the drum the first wire transfers the image on to the paper from the drum, the second one prevent the paper from sticking to the drum. One is or both are bad, BROKEN? Remove the assy. and replace both. They are very fine and fragile do not lose the springs. If that does not work you might have bad ends on the assy. after a while the plastic breakdowns and allow the voltage to go to ground. The wire carry around 2000 volts during the copy process. None during power off :) Open close the front door resets the code.
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You made the decision, Below the drum is assy. that houses two very fine gold plated wires that do two things since the paper goes between these two wires and the drum the first is transfers the image on to the paper from the drum, the second one prevent the paper from sticking to the drum. One is or both are bad, BROKEN? Remove the assy. and replace both. They are very fine and fragile do not lose the springs. If that does not work you might have bad ends on the assy. after a while the plastic breakdowns and allow the voltage to go to ground. The wire carry around 2000 volts during the copy process. None during power off :) Open close the front door resets the code.



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