Hi cpcer
Your MF731Cdw can make certain noises that are normal during operation that should not cause concern. Please try the following to see if it helps to resolve the issue, and to determine if the issue is cartridge or unit related:
1. Remove the toner cartridge from your unit. Inspect the cartridge to confirm no part of the encasing appears to be broken, chipped or damaged. Check that the bottom flap of the cartridge can be pulled back and when letting go it snaps back into place.
2. Set the cartridge aside and check the inside of the unit for any debris or jammed paper pieces. Also check for anything that seems to appear out of place, or broken.
3. If no visible problem inside the copier, tilt the cartridge to redistribute the toner and reseat the cartridge in the unit.
4. Try running a copy to see if the noise persists. If the noise continues, try swapping out the cartridge with a previous or new cartridge.
If you continue to have difficulties, please contact our support group using the following link:
http://Canon.us/ContactLI
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