I have the same problem. Replaced the OPC belt and it is still happening. Next I am looking into the ps kit2 which is reading 0% life after just under 2 years. If this is another "consumable" priced around $300, I will run screaming and never buy a Brother again.
BTW, my copies are striated, the color sux and is faded on the left side!
I had the same problem, except my 9420cn is just over 1 year old. The parts life section says everything has atleast 75% of it's life left. I checked the toner cartridges and found the gear on the cyan cartridge was jammed.
I have just browsed these boards so that I could vent...I just spent $500 for an electrician to come out and put my Brother MFC 9420CN on a dedicated circuit and line because I thought that it was not getting enough power causing the loud and grinding noise that you guys are talking about. The electrian, who was very patient and curious why his work did not solve the problem sat there with me and we discoverred that when the MFC 9420CN was connected to my computer via USB, the grinding noise occurred and the scanner acted strange. As soon as the USB cable was removed, it worked fine! What do you think, guys?
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Remove any paper trays. Inspect them for wrinkled or damaged paper.
Also open the back cover of the printer if this model has one.
Open any other doors that give access to the printer's paper path and to the toner or ink cartridge.
If necessary, remove the toner or ink cartridge. Place it away from light/ sun light to avoid damaging it.
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.
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.
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.
If the printer paper jam message still appears, then there is still some paper in the printer. Reinspect the paper path.
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.
Your unit requires replacement of the OPC belt. this is a consumable available from most suppliers of laser products. It is easily installed and the reset is in the menus on the printer.
Now the bad news, the opc belt will retail at something over the $600 mark and to be honest, most people who are in your situation simply go out and buy another printer. The whole unit retails at about $900 if you shop around.
There are few gears inside the copier that probably need to be replaced causing the grind and the copy quality to happen. It wasn't looked at by the engineer at the time because it happened after they left. They should come back in to fix it.
we have two of these printers, they seem tohave a problem with the opc belt drifting to one side, insist they swap it before its out a warranty, the next problem you will have is the fuser unit which will start to make a noise and jam prints, again this has happened with both my printers, they are both destined for the scrap heap at 18 months old as brother want nearly as much for the fuser as they do for the printer
My machine had the same problem. A service tech looked at my machine and pulled out the OPC Belt Drum Unit. The drum unit had a few issues: 1) jagged rips in it, something caused by running papers through that had staples or paperclips in them. So when the drum turns, it scrapes other parts and the machine sounds like its going to drop all its nuts and bolts--at least mine did!)! and 2) the spindles from the OPC unit has come loosened and fell off. The spindles and plastic cogs were found way at the bottom of the OPC Drum slot. This too was thought to have added to the rips in the drum.
I replaced the drum ($399 was the cheapest I could find) and the problem went away.