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Printing on NCR paper. Trouble is it keeps

Printing on NCR paper. Trouble is it keeps coating the drum and transfers black extra toner onto the forms marking them badly. Any suggestions.

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Print drums have a cleaning blade which scrapes off the excess toner after it has been hit with a charge to allow it to leave the drum.

If the blade is worn or has had a hard life then it may not be collecting all of the wast and returning it to the cartridge

You can take them out and clean them but it depends on your printer as to how easy that is to do

Posted on Jul 03, 2009


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What does opc belt do ?

OPC Belt (Organic Photo Conductor)
A photoconductor is a material that conducts electricity only when exposed to light. Photocopiers and laser printers have a large roller or belt coated with photoconductive material. As this drum turns it is electrically charged by a high voltage corona wire. The next step is to reflect an image using a laser beam or reflected light from mirrors onto the drum as it turns neutralizing the charge where light hits leaving a latent image or static charge in the shape of the image you want to copy.

The next step is to turn the roller past a brush made of toner (colored plastic particles). The static charge will pull the particles onto the charged area of the drum forming an image you can see, next feed a piece of paper onto this turning drum, as you do apply an opposite charge using a second high voltage wire (transfer corona) to the back side of the paper, causing the paper to stick to the toner/drum (opposite charges attract). Separate the paper from the drum using a high voltage alternating current (separation corona wire). Melt the toner into the paper with hot rollers. This will create a black and white image.

Jun 17, 2011 | Brother MFC-9420CN All-In-One Laser...


Understanding how laser printer works

Printing technology on organic photoconductor drum (OPC Drum) is summarized by the following 6 steps:http://i.fixya.netmabroukmedal_18.jpg
STEP1:The OPC drum must be charged with a negative charge, (electrons)
the primery charge roller apply a hight voltage to the drum.Note:if this step missing, (poor contact in the high voltage) the page will be printed all black) the charge roller is located on the drum.

STEP2: The laser beam reach the drum surface to discharge the zone of text that will be printed on the paper. Note: if the laser beam don't reach the drum,( the interlock switch is not actuated when the front cover is closed) the image will not be formed on the drum. the laser unit is showing on this picture:


STEP3:the developping cylinder prepare the toner to be taken by the drum, the surface that was touched by the laser beam are positive, they attract the toner by electrostatic force, the other zone push the toner because they have the same charge (both negative, coulomb law). the image will be formed on the drum surface.the developping roller is located on the cartridge.

STEP4:the transfer roller attract the image formed on the drum surface to the paper.Note: if the high voltage not reach the transfer roller, the paper comes out blank (poor contact), or if the transfert roller is dirty the quality of printing is bad. these is the picture of the transfert roller and the paper pickup roller :



STEP5:the image was transfered to the paper, and must be fixed by temperature, and pressure. the fixing unit or fusing unit is composed of :the hot roller and a pressure roller.


STEP 6: the clean blade or cleaning roller remove the residuel toner on the drum surface, to prepare for a new print operation. Note :if the cleaning step was not performed the page comes out with the trace of the last print page.

on Dec 07, 2010 | Epson EPL 5900L Laser Printer

2 Answers

Ricoh aficio 1515 printing faded images on one side. Just replaced the drum / toner / hot roller. Same issue when printing and copying What else could cause the problem?

Could be one of a few things:

Most likely is the transfer roller. If it's dirty or old and not applying enough charge, it may not be pulling all the toner away from the drum. Replacing the transfer roller is easy if you can get a new one.

Are you sure you have the correct toner? The wrong toner can definitely cause copy quality problems.

If the springs that hold the press roller against the hot roller are not properly in place (or if they have started to lose tension) the toner won't be fully fused onto the paper.

I'd start with the transfer roller (black roller that sits opposite the drum on the right side door) first -- it's the most likely culprit.

Jun 17, 2010 | Ricoh Aficio 1515MF All-In-One Laser...

1 Answer

The printing is clear but on the buttom of every page it is like a duplicate printing with grey color. What is wring on my printer or I need to change toner?

First thing to consider is a toner getting low but it can be a drum, fuser (fixer) or transfer roller. If it repeats the grey at a certain interval it's likely a roller in the fuser/fixer, the drum (light sensitive coated roller is all it is) or a failing transfer roller (it charges to pull the toner image off the drum onto the paper and hold it till the heat of the fuser bonds it to the paper). Easiest and least wasteful, and what Brother would tell you to do first, is to replace the toner. If it doesnt correct it you still have the new toner to use once the problem is corrected. By virtue of it being fine except the end of the page sounds like toner. One way to figure it out definitively is send a page while the exit door is open. Watch and once half the page is out of the exit door open the toner door to stop the printing. It wont hurt anything but will allow you to see the end of the sheet before it goes to the fusing unit. Of course you need to be very careful removing the sheet to prevent damage to the fuser. If you get the grey on the bottom of the sheet during the half sheet test I mentioned then it's in the image creation and transfer, not the fuser/fixing stage. Replace the toner and try a full sheet. If corrected it was the toner. If not then the drum or transfer roller would be at fault. Drum is user replaceable and while expensive it's another item you can store back on the shelf till you need it if the new drum doesnt help.Transfer roller needs to be replaced by a service person.You could do it but you would need to have the section of a service manual to show you what to do.

Jun 12, 2010 | Brother HL 5250DN Laser Printer

1 Answer

Oki C3100 - v poor print quality

Hi Errol

The way to identifiy your problem is to send a full colour print to your printer and open the top just as the paper starts to come out . if you then remove your toner / drums for all the colours you can see the transfer belt if the quality of the image that you can see on the transfer belt is good and clear your problem is with the transfer form the tranferbelt to the paper and not any toner /drum issue and the most likley cause is the transfer belt itself "but before you relpace it remove it and clean around the electrical contact points and generally make sure the internals of the printer is free of loose toner .

Regards Alan (Alstech)

May 13, 2009 | OKI C3100 Led Printer

1 Answer

OKI Laser Printer C5300 printing on paper with black flecks

IF you are using after market black toner then we found your problem. Putting a real toner on now wont help cause dodgy toner is now in the drum, you need to replace Black drum and use real toner. If you are using gen OKI toner, then just replace the Black (K) drum.

Clean led head and these printers dont need a teco, they are designed for wearing parts to replaced by operator ie Transfer belt, fuser, drums and toners.

Nov 20, 2008 | OKI C5100n Laser Printer

1 Answer

Noisy operation and black marks on left side of printed paper

vacuum out the waste toner passages that lead from the drum and transfer belt to the waste toner container. Toner is building up inside the transfer belt and/or drum and has no place to go except onto your paper.

Nov 06, 2008 | Samsung CLP-510 Laser Printer

1 Answer

Running NCR on canon IR 8500

Hello Visionsp, NCR paper is special in so many ways (uhg).First of all is is typically thinner than regular 20# bond paper. Second,each sheet is chemically "married" to the other as there are ink beads on the back of one sheet that are activated by the unique beads on the face of the second sheet so to some degree they are manufactured to be mated together. So unless your paper feed system is @100% then the sheets (2 or 3 sheet NCR) are more difficult to seperate and are inclined to feed two sheets at once. THE BIGGIE is this. Consider the fact that in order to produce the carbon copy image that is being transferred from the top sheet to the pages below it requires pressure from from the pen. Your IR 8500 (and all modern copiers) has a section of the copier called the fuser.It uses extreme heat and pressure to bond the powdered carbon based toner to the paper by passing your normal copies between two heated and tightly gripped rollers, kinda like using an iron with extreme force. When the NCR paper passes through the fuser the exteme heat and "pressure" break the chemical ink beads on the NCR paper and begin to leave a layer of the very same chemical ink on the rollers as they pass thru.But instead of only trace amounts of carbon copy image (as would be reproduced by a customers signature on to the next sheet ) the entire NCR sheet is being heated and mashed and a large amount of the chemical ink is being activated rightat the point of maximum heat and pressure. Not only is this sticky as *&%$ ,but it leaves a residue on the fuser rollers (since there is no paper to transfer the beads to) and the rollers build up with ......basically ink. So at some point the copies going through the fuser will rather wrap around the rollers or cause "accordion" jams because the telon coated rollers are no longer coated with non stick teflon but are coated with tacky gunk. The only workaround for this is to run small runs of the NCR paper at a time, then run regular white paper for a while which will remove the buildup and then another quick run of NCR and so on. I have worked on Canon,Toshiba,Ricoh,Savin and Kodak copiers.The results are the same.NCR paper is not designed for regular copiers as they all use the same type fuser system. A press or a RISOGRAGH are the only reliable systems to run NCR paper. I wish I had better news.NOTE: even the workaround I have provided,which can work, does not eliminate the possibility of ruining the fuser rollers beyond repair. good Luck...............SPINAL

Feb 09, 2008 | Office Equipment & Supplies

1 Answer

Printing faint

I believe this is a timing problem, you have done alot yet the same problem recurs . Compare the toner drum assembly holder positioning with another similar printer to justify its timing. Remove this holder drum and inspect the metallic contact tracks behind it.

keep me posted on this


Jan 29, 2008 | Epson AcuLaser C900 Printer

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