Interpretation
What this message does — and does not — prove
Official meaningReplace Drum is a drum-life maintenance state. Brother instructs users to reset the drum counter when a new drum unit is actually installed.
Do not assumeDo not reset the drum counter merely to hide the warning while keeping the old drum; Brother explicitly warns against resetting it unless the drum is replaced.
Safe sequence
Work through the manufacturer-scoped path
- 01
Confirm the message is Replace Drum rather than a toner message.
- 02
Install the correct replacement drum unit.
- 03
Reset the drum counter only after installing the new drum.
- 04
Print a grayscale/fine-line reference to verify output after maintenance.
Stop / escalate
When not to keep experimenting
If Replace Drum remains after a new drum and correct counter reset, use Brother support to check installation/detection state.