User Manual - Page 196

For MFC-8840D. Also, The document are for others Brother models: MFC-8440, MFC-8640D, MFC-8840DN

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12 - 35 TROUBLESHOOTING AND ROUTINE MAINTENANCE
Follow these steps to replace the drum unit:
1
Press the cover release button and then open the front cover.
2
Remove the old drum unit and toner cartridge assembly. Place
it on a drop cloth or disposable paper to avoid scattering toner.
Caution
To prevent damage to the printer from static electricity, do not touch
the electrodes shown below.
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