Question about Brother MFC-9420CN All-In-One Laser Printer

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Loud and Grinding noise

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!

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  • msss May 05, 2008

    We are getting a loud grinding noise. It is inconsistant. I have looked at all the internal components but don't see anything obvious. I thought that it might have been a new toner cartridge that we had just installed. We tried another cartridge but still get the noise. I am puzzled.

  • Anonymous Apr 04, 2009

    I had the sam problem as well, during my cartridges inspection I noticed that the gears on my cyan cartridge was jammed too. I replaced it and the noise has gone...

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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 replaced it and no more noise....

Posted on Feb 25, 2009

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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?

Posted on Apr 25, 2008

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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.

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