Can you keep using it?
Can you keep using it?
Contact customer support if any of these apply
- !Cannot Detect remains after careful reinstall.
- !The toner or drum assembly no longer aligns or locks normally.
What to check first
Step-by-step checks
- 1
Consumable check
Remove the toner cartridge and reinstall it in the drum unit carefully.
Start with the official recovery step before moving on to parts or deeper servicing.
- 2
Consumable check
Reinsert the assembled toner-and-drum unit into the printer.
- 3
Consumable check
Retry only after the cartridge seats normally.
Background
What this message usually means
Brother shows Cannot Detect when this color laser family cannot detect one of the toner cartridges normally. The official guidance focuses on removing the toner cartridge, reinstalling it into the drum unit, and confirming it seats properly.
Diagnosis
Likely causes
A toner cartridge is not seated correctly in the drum unit.
The printer cannot detect one cartridge after replacement or handling.
A toner-to-drum installation step was left incomplete.
Service
When service or replacement is more likely
- -This is a toner-detection issue first, not a paper or network fault.
See also
Related codes in this family
Explore more
More Brother printer families
Source notes
Brother's official Cannot Detect article says the machine cannot detect a toner cartridge and walks users through reseating it in the drum unit.
Built around official Brother HL-L32xx and MFC-L37xx color-laser support pages. Exact wording can vary a little by region and model, but the message meanings stay close across the shared TN229 platform.
Printer error codes can vary a little by firmware, region, and exact model variant. Use this guide as a family-level starting point and stop if the next step would require disassembly or service-mode changes.
Known family variants: HL-L3220CDW, HL-L3280CDW, HL-L3295CDW, MFC-L3720CDW, MFC-L3765CDW, MFC-L3780CDW
Last reviewed: 2026-04-12
Reference: Open reference