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Below are instructions that I have found from the internet. Hope that they will help.
Open the front cover of the printer.
Hold down the Go button for 4 seconds until all the LEDs light up. Then release the Go button
Remove the drum unit and toner cartridge assembly.
Replace the drum unit and toner cartridge assembly back into the printer.
Close the front cover of the printer
Your drum unit should now be reset
MFC / DCP PRINTER SERIES
1.Remove the drum unit and toner cartridge. Wait 1 or 2 minutes.
2.Replace the drum unit and toner cartridge into printer.
3.The error message "Change Drum Soon/Drum end soon" will continue to appear if the drum counter was not reset when you replace the drum unit.
4.To clear this error message, you need to reset the drum counter as instructed below.
5.Make sure that the machine is turned on.
For MFC users: To confirm you are installing a new drum, press 1. For DCP users To confirm you are installing a new drum, press the Up Arrow key
7.When the LCD shows Accepted, close the front cover.
8.Your drum is now reset.
Resetting the drum unit will not improve print quality. It only resets your drum and allows you to continue to print. You decide when to replace the drum unit not the manufacturer!
Time to really order a new drum and really replace with a new one.
Resetting the drum unit will not improve print quality. It only resets your drum and allows you to continue to print. You decide when to replace the drum unit not the manufacturer!
1.Remove the drum unit and toner cartridge. Wait 1 or 2 minutes.
2.Replace the drum unit and toner cartridge into printer.
3.The error message "Change Drum Soon/Drum end soon" will continue to appear if the drum counter was not reset when you replace the drum unit.
4.To clear this error message, you need to reset the drum counter as instructed below.
5.Make sure that the machine is turned on.
6.Press Options.
To confirm you are installing a new drum, press 1.
7.When the LCD shows Accepted, close the front cover.
8.Your drum is now reset.
Some
Brother laser printers have separate consumables - the toner cartridge
and the drum unit. From time to time you may need to replace only the
drum unit and not the toner cartridge.
The
error LED lights up, or an error message shows on a flat screen panel,
when the drum unit is near the end of its working life. Use the drum
unit until you have a print quality problem, then replace the drum unit
with a new one.
Are you sure of the error message? The Brother printers that I have used have Drum Ends Soon and Change Belt messages.
The Brother MFC-9440CN has a belt that can be replaced. The Belt unit has an life expectancy of ~50000 pages. The belt unit is part BU100CL and costs a bit over $150 at office supply stores. Amazon.com and some other stores have the unit for under $100. http://www.amazon.com/Brother-BU-100CL-HL-4040CN-HL-4070CDW-Series/dp/B000SC245E is one source.
When the unit says Change Belt Unit, follow the directions from the manual's maintenance section to replace the belt unit. See page 178 (page 189 of the PDF) http://welcome.solutions.brother.com/BSC/public/files/dlf/doc002252/mfc9440_usa_usr_b.pdf . You have to remove the Drum and then the Belt Unit. Then slide in the new Belt Unit and replace the Drum unit. Then close the printer and turn it on. Finally reset the counter from the Machine Info sub menu (press Menu 8 4 and select the Belt Unit and press OK. Then press 1 followed by Stop/Exit).
If you mean the Drum Unit, that is part DR-110CL and costs over $175 at the office supply stores. Order this part when the Drum End Soon message appears and replace it if the print quality deteriorates (or when you have the new drum). The Drum Life is ~17000 pages. The steps start on page 166 (182 of the PDF). You need to remove the old Drum unit. Then remove the toner cartridges from the drum. Prepare the new Drum Unit, including putting the cartridges in the new Drum. Then replace the Drum unit and reset the counter.
The "replace drum soon" indicater is a warning for you to have a new replacement drum "on-hand". Soon the display will change to "REPLACE DRUM" AT WHICH TIME THE UNIT WILL STOP PRINTING.
When the new drum cartridge is then installed...the REPLACE DRUM indicator will be reset. DO NOT replace the drum before the machine says to.
This message will appear if the drum unit is near the end of its life. Use the drum unit until you have a print quality problem, then replace the drum unit with a new one
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