Loud grinding noice before starting to print

See page 2-25 of service manual and confirm mechanical parts are in their proper position.

brother-dcp-7030-7040-7045n-mfc-7320-7340-7440n-7450-7840n-7840w-service-manual.pdf (laserexpressinc.com)

ok first try restarting your printer, then try uninstalling the driver for your printer off your computer, restart your computer and printer and then reinstall your drive for the printer, see if you get a replacement for your printer or a refund

The humming might be an wheel miss-alignment. and/or
Grinding maybe the steering box (rack and pinion)?

******* ALL this could also be a worn out BALL JOINT, in which case you should have this checked out RIGHT AWAY!!!
VERY DANGEROUS to drive!!! ******

Hi Harden,
Thats an issue with the fuser assembly,try to check the teflon condition/ teeth gear might have worn out.

Refer to the service manual in disassembling the device.. Clean it thoroughly then try it again.. If, you have no experience in doing so, hire a qualified tech to do so.

you could have bad cv joints. does it make a popping or crunching noise as well? I would also take a closer look at the inner pads as well the inners wear out quicker.

It can be that the paper drawing mechanism of the roller and the geared drive has an issue, possible that the motor has a play with the roller out of alignment , producing a difference of gap in the roller settings. If so the paper will be drawn into in different lengths so as to jam with the uneven pulling.

please try this

1. Turn off the printer.
2. Remove any paper trays. Inspect them for wrinkled or damaged paper.
3. Also open the back cover of the printer if this model has one.
4. Open any other doors that give access to the printer's paper path and to the toner or ink cartridge.
5. If necessary, remove the toner or ink cartridge. Place it away from light/ sun light to avoid damaging it.
6. If you find a piece of jammed paper, remove it by holding it with both hands and pulling firmly. The goal is to keep the paper from tearing. If several pieces are jammed together, try pulling out the middle piece first to loosen the jam.
7. If the paper does tear, try rotating the roller gears manually to free the paper. Don't force anything, though. Do this step especially if the jam message comes up repeatedly without any obvious paper jam, there may be a small tear of paper inside.
8. Ones the printer is free of paper Replace the toner or ink cartridge and paper trays, close any doors you opened and turn the printer back on.
9. If the printer paper jam message still appears, then there is still some paper in the printer. Reinspect the paper path.
10. see alternative if the problem is still not solved.
    

alternative :
Load a piece of thick paper, for example photo paper and press the resume button (may be diffrent button on diffrent models) a few times to the printer picks up the paper and puts it through the machine.

My Dishwasher had the same loud Grinding Noise.
It was a piece of a plastic fork lodged behind the macerator blade.
This is at the suction to the pump just under the strainer. check this out first before you pull everything apart. You should be able to get to it by taking the lower arm off and pulling the strainer out. Hope this helps.

Same problem after a paper trapped. I don´t know if the paper trap was because something broke, but after I took the paper the noise started. Please someone give us a solution.