Question about Brother MFC-9440CN Laser Printer

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Changed colour cartridges but it still says drum error

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The "drum" is where the laser adds/subtracts an electrical charge to each spot on the drum.

The printer "throws" the powdered-ink at the drum.
The ink sticks to the "charged" spots, and does not stick to the "non-charged" spots.

Then, the printer puts a sheet of paper in contact with the drum, and the ink is transferred to the paper.

Then, the "fuser" heats the paper & ink, and "melts" the ink into the paper.

So, changing the ink-cartridges will _NOT_ fix any "drum" problem.

Posted on Jun 01, 2010

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Posted on Jan 02, 2017

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  1. Open the top cover.
  2. Slowly take out the drum unit and toner cartridge assembly.
  3. Push down the lock lever (1) and take the toner cartridge out of the drum unit (2).
  4. Turn the drum unit gear by hand while looking at the surface of the drum roller (1).
  5. Wipe the surface of the drum gently with a dry cotton swab until the dust of glue on the surface comes off.
  6. Put the toner cartridge back into the drum unit until you hear it lock into place. If you put the cartridge in correctly, the lock lever on the drum unit will lift automatically.
  7. Put the drum unit and toner cartridge assembly back into the machine.
  8. Close the top cover.

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