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

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Replace OPC belt message

I have a message on the all in one screen stating replace OPC belt. The machine makes a grinding noise when printing. I asked a local computer repair store and they would not touch a Brother product due to poor parts and service. Any suggestions other then sending to Brother dedicated repair center and be w/o a printer for ?? days.
Any answer is appreciated, I know buy an HP.

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  • dgillespie Dec 17, 2008

    Same problem here with both the OPC belt and grinding noise. I replaced the OPC belt and reset the timer: works good. However, there still is a grinding noise after about 20 or so pages get processed on a fax. Any ideas?



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  • 78 Answers

Dear tporteous,

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.

Sorry dude.


Posted on Dec 10, 2008


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Error msg appear set belt cg dont know what to do.. am i have to replace the photodeveloper cg?

The error can either be caused by the OPC/OPC Marker assembly or the Main Motor assembly. Please follow the recommended troubleshooting steps:
  1. Power the printer off, remove and reseat the OPC unit, and power the machine back on. Print a test page. If error continues, proceed to step 2.
  2. Power the printer off and remove the OPC unit. Check the OPC Marker Sensor. If it is unsnapped or unplugged, reseat or replug it, and power the printer back on. Print a test page. If error continues, proceed to step 3.
  3. Remove the OPC unit and check it for scratches or defects. Also check the the markers on the OPC to make sure they are not damaged. Is the belt scratched or damaged? If the OPC is at or near the end of its life, OPC unit must be replaced. If the belt is in good condition, contact Lexmark technical support (if printer is under warranty) or your local authorized service provider for assistance.

Sep 30, 2010 | Lexmark C500n Laser Printer

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If I print a large quantity in one print, the first two or three pages wil print fine then the rest will mess up. The left hand side of the page will mis-print and it squeals every so often. I just...

the drive gear assy. that moves the opc belt are broken.
honestly is time to get a new machine instead of spending a lot of money trying to fix this Lemon,sorry.,

Sep 10, 2010 | Brother MFC-9420CN All-In-One Laser...

1 Answer

Menu screen comes up with (Replace Belt CG)

The 'Replace Belt CG' message on the 8008 indicates the OPC Belt (Green Reflective Belt which is located in the top of the printer) has reached the end of its life and needs to be replaced to ensure the print quality is maintained.
If you are happy with the print quality you can clear the message via the control pannel on the printer, you will however need to remember you have cleared the error in the future when print quality is reduced you will then need to replace the OPC Belt.

The ‘Replace Belt CG’ message can be cleared in the following way;

With the printer OFFLINE hold down the MENU button for 2-3 seconds until the display changes UTILITY MENU and then release the MENU button
Press the MENU button once more
The display will read "Utility Menu Clear Belt CG", press the MENU button once more
The display will change to "Clear Belt CG Not Execute" by pressing MEDIA/> key again the display will change to "Execute"
Press the MENU/ENTER key again after 10 seconds the display will change to "Completed Clear belt CG"
Press the UP ARROW button twice to exit the Utility Menu
Press the ONLINE button to return the printer to the ONLINE state

The ‘Replace Belt CG’ message will now be cleared.

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Brother MFC-9420CN Paper Jam Error message w/ loud grinding noiz

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.

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Brother mfc 9429cn

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

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1 Answer


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.

An expensive repair but for me it worked...

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Brother MF 9420CN is asking for troubleshooting and routine maintenance 'unable to print'

Via the control panel (This is a Factory Reset)
  1. Make sure the machine is not operating, then disconnect all the cables from the machine (except power cable).
  2. Press the Menu or Menu/Set key on the control panel.
  3. Press up or down navigation key to select LAN and press Set or Menu/Set.
  4. Press up or down navigation key to select Factory Reset and press Set or Menu/Set.
  5. Press 1 to select "Reset".
  6. Press 1 to select "Yes".
  7. The machine will re-start, re-connect cables once this is complete.

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