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MFC-7420 > FAQ's & Troubleshooting > Maintenance > faq000154_049
Follow the procedure below to replace drum unit.
The Brother machine has separate consumables the toner cartridge and the drum unit. Verify you replace only the drum unit and not the toner cartridge. If you want to know their difference, refer to "What is the difference between the toner cartridge and the drum unit?"
Do NOT use flammable substances or any type of spray to clean the inside or outside of the machine. Doing this may cause a fire or electrical shock.
Just after you have used the MFC, some internal parts of the machine are extremely HOT! Never touch the shaded parts shown in the illustration.
To prevent damage to the printer from static electricity, do not touch the electrodes shown below.
Open the front cover and pull out the drum unit and toner cartridge assembly.
Hold down the lock lever on the left and pull the toner cartridge out of the drum unit.
Unpack the new drum unit.
Reinstall the toner cartridge into the new drum unit. If you put it in properly, the lock lever will lift automatically.
To avoid print quality problems, DO NOT touch the shaded part shown in the illustration.If you accidentaly touch the shaded part, wipe the surface with a dry lint-free soft cloth.
Install the drum unit and toner cartridge assembly in the MFC.
To confirm you are installing a new drum, press 1.
When the LCD shows Accepted, close the front cover.
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