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Hi, the drum is green roller in housing with toner, you should order the drum cartridge for your fax. With new drum you get the how to manual also. Follow the procedure. NOTE THAT THE DRUM UNIT IS SEPARATE FROM TONER UNIT.
You may need to change your drum unit. The replacement part number is DR400
To replace the drum unit follow the instructions listed below:
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 FAX/MFC, some internal parts of the machine are extremely HOT! When you open the top cover of the FAX/MFC, never touch the shaded parts as shown in the diagram below:
Open the front cover.
Remove the old drum unit. Place the drum unit on a drop cloth or large piece of disposable paper to avoid spilling and scattering the toner.
Remove the toner cartridge by holding down the lock lever on the right and pull the toner cartridge out of the drum unit assembly.
Wait to unpack the new drum unit until immediately before installing it. Place the old drum unit into the aluminium bag.
Reinstall the toner cartridge into the new drum unit.
Reinstall the new drum unit, keeping the front cover open.
Press the Clear key to display drum status.
Press 1 on the telephone keypad.
When the display shows "ACCEPTED", close the front cover.
Discard it according to local regulations. If you are not sure of them, call your local Sanitation Department. Be sure to seal the drum unit tightly so toner powder does not spill out of the unit. When discarding used drum units, keep them separate from domestic garbage.
1. Open the front cover of the printer and remove the drum/toner unit.
2. Gently wipe the scanner window with a soft dry cloth. The scanner window is located on the roof of the inside of the printer.
3. On the top of the drum unit, locate the blue tab on the left side. Slide it back and forth across the drum about 30 times.
4. Remove the toner cartridge (TN430 or TN460) from the drum unit (DR400). To remove the toner from the drum: hold down the blue lever on the right side of the drum (DR400) and lift the toner (TN430 or TN460) off of the drum unit.
5. Inside the drum unit (DR400) there is a green roller. Wipe the green drum roller with a dry tissue (i.e. Kleenex). You may turn this roller by moving the gears on the far left side.
6. If the pages area gray pages or have gray vertical lines, install a brand new toner cartridge. If pages have dots, spots, smudges or horizontal lines, install a brand new drum unit. OR If you are still experiencing gray pages or gray vertical lines, please install a brand new toner cartridge (TN430 or TN460).
Brother strongly recommends that customers do not use generic drum unitsand/or toner cartridges, or refill their Brother toner cartridge. Each Brother laser printer is designed to work at pre-set temperatures that are matched exactly to each of our individual toner formulations. Each individual component is designed to work with the other to ensure quality and reliability. Using non-Brother supplies may affect the hardware performance, print quality and machine reliability. The Brotherlimited warranty does not apply to any problem that is caused by the useof unauthorized third party drum units, toner cartridges or toner.
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Printing irregularites on sent faxes are due to spots or a dirty scanner.
Spaces on received faxes are due to a dirty drum, corona wire, or a failing or improperly installed toner cartridge. A new cartridge should be gently shaken back and forth sideways prior to installation.
My first guess is a bad drum unit. Inside the assembly is a soft, plastic blade that scrapes off the toner that didn't make it onto the paper, so the next page will be clean. If dirt is stuck under the cleaning blade, it may skip, making marks like that on the drum, which get transferred to the page. Do you still have your old DR-400 drum, or can you borrow one from another machine? Swapping drums is the ideal test, if you can avoid buying a new one. If your new drum is bad, the seller should exchange it.
Have you tried both drum and toner supplies? cause it sounds like a drum fault, if you have tried a new drum and toner, and it is doing it when printing internal reports, receiving fax's and copying then you have a tecnical issue to do with charge and this would likely render machine unecomical to repair (unless you can find a bad contact with drum on machine). If it receives faxs clearly but copys black then it is different issue (ie optics).