Question about Samsung SCX-4720FN All-In-One Laser Printer

1 Answer

"Clean drum" doesn't get rid of smears.

Printer less than 3 months old, light use single user office. 

Getting toner smudges down center of paper.  Have tried "Maintenance - clean drum" but it only helps temporarily.  There is toner residue on green roller in cartridge but even if I wipe that off, it keeps coming back after a few copies.

Posted by WaltinVt on

  • WaltinVt Nov 06, 2007

    Since probably less than 1000 copies through this toner (first) cart, Samsung should replace it.

  • WaltinVt Nov 07, 2007

    Samsung would do nothing. New machines come with a demo cart (1000 copies) and my 791 page count was "well within the expected" range for it to start malfuncting". I'll go back to Canon or HP for my next machine.



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Need to change cartridge, the residue is not being cleaned off by the Drum Blade.

Posted on Oct 29, 2007

  • CheckitRight
    CheckitRight Nov 07, 2007

    They may give you partial credit for copies used or return as defective anyway they should replace it.

  • CheckitRight
    CheckitRight Nov 07, 2007

    Sorry to hear that , you can find it on Ebay for $25 which is the cheapest.

    Good luck.

    P.S: can youmark as solved, thanks.



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Related Questions:


Printing - Smudges, Lines?, Tracking LInes? How to Clean a Laser Printer

Smudges, Lines?, Tracking LInes? How to Clean a Laser Printer

Smudges Smears and dirty tracks on your paper are from your roller bar's build up of toner. You can do this yourself if you're willing to put some effort into it. The solution to this is written below.

To clean up a laser printer that's leaving lines/smudges/smears on paper do the following and should you get stuck post the problem you're having to us on for some further assistance.

Digging into the guts of your machine is how you clean it up if you know how or are handy this way with things mechanical. And, may be the only way if you've printed a lot of sheets and the inside of your printer is filled with toner dust. The dust comes off the paper itself and just gets inside and starts to blow around until you see what you're seeing on your printed document.

Two things to be aware of though, you will want to do this outside or in a garage on a plastic sheet and wear gloves. The toner is static sensitive by design and it gets everywhere. You'll want a small vacuum with a clean bag you'll trash later, canned air, a 3/4 inch natural bristle paint brush (less than a buck type) and some lint free rags. All these things you'll have to trash when you are done as you'll get them saturated with toner. I use an old Orek cannister vacuum outside and no bag to get better suction and the hose can be swapped easily on this vacuum with the exhaust to blow out (blow the toner out first before you use it on your printer. The vacuum blow side is good and economical instead of going through cans of air all the time.

Remove your toner cartridge carefully, close the open port and place it in a bag large enough and place it well aside.

Disassemble the unit in a laid out order that will help you to reassemble it later.

As you take each component out blow it off in an area away from disassembly area and downwind from you. Look for areas you can clean out further with your disposable brushes and then blow that area out too.

When you get to the rollers and have done the above sequence put a clean brush in alcohol and wipe down the rollers until they're clean. Once the rollers are done, you'll need another clean brush and soak the rollers down with clean water. The alcohol shrinks the rubber compound and the water will rehydrate them. This is pretty important as a roller that has shrunk from dry humid climate or cleaning the rollers will start to slip or worse one side will and the other won't and you'll have a paper jam.

Go through your entire unit this way and on reassembly you may want to look the gears over and see if the white lithium is pretty dark, if so clean those off by wiping and add new white lithium grease jto them.

Be pretty careful putting the toner into place and make certain it is latched correctly.

Once the unit is clean and reassembled just plug the unit it while your still in your clean up area and power on and then off. Do this a couple of times so the gearing seats itself. When you energize a printer fully, it goes through a power on self check, that will fail if you don't power on/off quickly a few times for the gears to seat themselves. Then let the system energize completely. You may get an error message, don't be too surprised, just look it up and see what needs to be done about it.

Once it energizes and powers up with no error messages other than you're not connected to a computer start feeding sheets out the printer until they come out clean.

You should be good to go at this point.. With your computer off, connect to your computer and power up. If you have any trouble post your problem here at or you can reach me at:

Good Luck and Happy Cleaning,

on Jul 20, 2008 | Laser 22 ppm Mono Printer

3 Answers

Black smudges down left side of page

How do I clean white or black spots on printed documents? Description: First make 10 to 15 copies of a blank, white sheet of paper.
If you still see the spots on printed documents after making multiple copies, clean the drum unit as follows:

  1. Remove the drum unit and toner cartridge assembly, and then remove the toner cartridge from the drum unit.
  2. Position the print sample in front of the drum unit so you will know the exact position on the drum that is causing the poor print.
  3. all-ug-19.gif
  4. Turn the black gear on the drum as you check the surface of the OPC drum.
    The OPC drum is photosensitive so do not touch it with your fingers.
  5. all-ug-20.gif
  6. When you find the substance on the drum surface that matches the print sample, gently dab the surface of the OPC drum with a cotton swab that is lightly dampened with isopropyl alcohol.
  7. Note
      • Do not use a scrubbing or wiping motion because this might damage the drum.
      • Do not try to clean the surface of the OPC drum with a sharp object, such as a ball-point pen, because this might cause permanent damage to the drum unit.
  8. If the print quality still has not improved you need to install a new drum.

Dec 02, 2010 | Samsung ML 2010 Laser Printer

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The document printed from samsung scx 4200 printer has smudges and dots.

When you say smudges, can you wipe the toner from the page with your fingers; or is it just smearing when it prints; but, the toner is affixed to the paper?

1) If you can smear it with your fingers; replace the fuser. It's not heating the toner properly
2) If it is smearing, but sticking; replace the DRUM.

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We have a Ricoh Aficio CL3500N. We are getting a

Never clean or touch the Transfer Roller (spongey rooler) unless your using a dry cloth or vaccum as last measure.

Usually the transfer roller sits on a drum/pcu specific to that color. If you can tell which color is sitting on to of the roller replace that drum/pcu.

Jul 15, 2009 | Ricoh Aficio CL3500N Laser Printer

1 Answer

Unwanted gray stripes on paper

Printer needs a good clean and service.
Toner particles have probably split onto the fuser drum or has been contaminated by previously printed paper losing some toner.
As the particles get re-heated, they become waxy and smear around the drums and rollers.
For stripping and cleaning procedure, check the FIXYA manuals and tips, searching for your model, or similar one, or try a manuals download website and enter your make & model.
HP may also have the info.
You'll probably need a service manual rather than the user manual.

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Brother MFC 7820N Smudging Concern

If smudged stains appear at the top center of the printed page:
  • Make sure the paper is not too thick or curled.
    Also, verify that the appropriate paper is being used and that the paper type set in the machine matches the media used.
  • Make sure the paper is not curled when you print on the back side of the paper with the Print Odd Pages and Print Even Pagessettings.

- If smudged stains appear at the right or left corner of the printed page:
  • Make sure the paper is not curled when you print on the back side of the paper with the Print Odd Pages and Print Even Pagessettings.

- If smudged stains appear on the reverse side or at the bottom of the page:
NOTE: Illustrations shown below are from the representative product and may differ from your Brother machine.
  • Make sure the printer platen is not dirty with ink.

    How to clean the machine's printer platen
    1. Unplug the machine from the AC power outlet.
    2. Lift the scanner cover until it locks securely in the open position.
    3. Clean the machine's printer platen(1) and the area around it, wiping off any scattered ink with a soft, dry, lint-free cloth.
    4. Close the scanner cover.
  • Make sure you are using Genuine Brother Innobella™ Ink.
    > Brother Genuine Supplies information
  • Make sure you are using the paper support flap.

    To use the paper support flap, pull out the paper support (1) until it clicks and unfold the paper support flap(2).



Sep 11, 2017 | Brother MFC-7820N All-In-One Laser Printer

2 Answers

Dirty Edges

I'm sorry to tell you, this is likely a drum issue.

You probably need to have a certified engineer examine the machine.

Have you tried speaking with the local service center to see if they have experienced similar issues? It might be free information.


May 13, 2008 | Xerox WorkCentre XD120F Laser Printer

1 Answer


Hmm... This sounds like it is a toner problem. If your roller is getting too much toner then it just globs it onto the paper even though the drum is not asking for it. Are you using a new toner cartridge or a re-filled one? Is it from Brother or a 3rd party? I suggest you remove the toner cartridge and check inside the printer. Clean any spilled toner. Check the toner cartridge for leaks .. give it a good shake and see if it is leaking. If you have another toner cartridge, you can replace it to test. You may need to pint a few pages to see a change. Another test could be to print a few (2-5) "BLANK" pages. The printer should not be depositing any toner. If no smudge or the smudge stays the same, then the toner cartridge is the likely problem. If the smudge is there, but gets smaller, then clean your printer.

Good luck!

Jan 10, 2008 | Brother HL 2700CN Laser Printer

2 Answers

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Hi, try to pull out complete process unit(cartridge) with toner box .You have cleaner(blue or green color) move this cleaner from right to left side 4 or 5 times.Note that cleaner MUST be in home position-right side when you finish.Check print.
If problem still persists, you must do following:take away small grey plastic cap on left side of cartridge,then push complete charge corona(part with cleaner on top of it) to left side just enough to lift right side of corona from cartridge.Pull out that corona and you can see drum and developer roller. Turn the gear on drum,and look for smudges on black developer roller.Try to clean smudges with brush or with dry cloth.Toner will again attract to that area,but regular.

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