Question about Canon imageCLASS MF5750 All-In-One Laser Printer

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I bought a refurbished toner cartridge for my printer a few weeks ago. Now it smears the ink! How can I fix this?

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This is the test to determine toner or fuser issue.
Print a test page
When you hear the paper feed into the machine open the top to stop the machine
Remove the toner cart.
You should be able to see the page with printing on it. (This is before the page hits the fuser)
If you can see the smudge or marks on the page the problem is most likely the cartridge but NOT the fuser.
If the page is clean the problem is most likely the fuser.

Posted on Mar 14, 2009

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I don't normally say "call the manufacturer" but if it's a genuine HP cartridge (not another brand, and not refilled) call 1-800-HP-Invent and they'll walk you through a few steps, and if the cartridge is defective they'll send you a new one.
The toners have an out of the box warranty, so if you took the toner out of the box 3 weeks ago, it's still under warranty.

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Hi there,

This problem is often caused by spilled toner. Open the printer, carefully remove the cartridge, and give it a few bursts of compressed air. Often running several pages or type through will also fix this. If it persists, replace the toner cartridge.

Hope this initial info/idea helps. Let me know for any clarifications.

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take the cartirdge off. and get a genuine one.
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1 Answer

Smeared lines


Okay, this was the problem I posted a few days ago. It's fixed now, so in case you have the same problem with smearing, here's what the help desk from Canon suggested: Open the cover and remove the ink cartridges. There is a gray lever in front of the cartridges. Lift this lever and the printhead can be easily removed.
Our printhead had a buildup of black ink on the surface. I carefully removed this with rubbing alcohol. I let the printhead dry and replaced everything. No more smearing. Imagine a help-desk that actually helped!

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1 Answer

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Laser printers do not use Ink. The problem is most likely a defect on the drum, which in this model printer, is part of the toner cartridge. Replace the black toner cartridge with a known good one and test.

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Hey m8


  • Buxie, first off you have voided your warrenty, secondly
  • If marks repeatedly appear on the printed side of the
    page at even intervals:
    • Clean the inside of the printer. See “Cleaning the
    Inside of the Printer” on page 5.7. After cleaning
    the inside of the printer, if you still have the same
    problems, install a new toner cartridge of the
    problem color. See “Replacing Toner Cartridges” on
    page 5.3.
    • Parts of the printer may have toner on them. If the
    defects occur on the back of the page, the problem
    will likely correct itself after a few more pages.
    • The fusing assembly may be damaged. Contact a
    service representative.
  • If horizontally aligned color or black streaks or
    smears appear:
    • A toner cartridge may be installed improperly.
    Remove the toner cartridge and reinsert.
    • A toner cartridge may be defective. Install a new
    toner cartridge.
    • If the problem persists, the printer may require
    repair. Contact a service representative.
  • SXPRESS- It is normal to have to replace it after that because the starter cartridges are rated for 1500 pages but that is at only 5% page coverage and most people print alot higher coverage than that, and the replacements cover 2000 pages again @ 5% page Coverage

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