Troubleshooting a Printer Canon MF751
If your Canon MF751 printer prints pink or magenta edges on your pages, that’s usually a sign of a toner issue or maintenance problem. Here's a step-by-step list of things to check and try:
1. Check the Magenta Toner Cartridge
Over-saturation or leakage can cause pink tinting.
Try removing and gently shaking the cartridge side to side, then reseat it.
If the problem persists, try replacing the magenta cartridge with a new or known-good one.
2. Clean the Printer Internals
Open the printer and check for toner dust buildup, especially around the fuser, rollers, and toner area.
Use a lint-free cloth, vacuum, or compressed air (made for electronics) to gently clean.
Be careful not to touch the drum surface if it's exposed.
3. Print a Color Calibration or Test Page
This helps you isolate if the magenta is bleeding where it shouldn’t.
Navigate the menu on the printer:
Menu > Adjustments/Maintenance > Color Calibration or something similar.
Also try: Print Quality Report / Demo Page / Diagnostic Page.
4. Run a Color Calibration
On the printer menu or from the Canon MF751's web interface:
Go to: Settings > Adjustment/Maintenance > Auto Adjust Gradation or Calibration.
This realigns toner and can fix misapplied colors.
5. Check Print Settings from Your Computer
Sometimes, the driver settings or color profile could mess with output.
On Windows:
Go to Devices and Printers > Right-click MF751 > Printing Preferences > Color Settings.
Try resetting to Default or checking the color profile being used.
Try printing the same file from another computer or app (PDF reader, Word, etc.) to rule out a software issue.
6. Firmware Update
Canon occasionally releases firmware updates that resolve print quality bugs.
You can check for updates here: Canon MF751 Support Page (or your country’s Canon support site).
If none of that works:
The drum or fuser unit may be near the end of its life, especially if this is a high-use machine.
Drum units sometimes wear unevenly and start depositing residual toner on edges.
You might consider getting a maintenance kit or having a technician inspect it if you're seeing consistent pink along all page edges.