Brother Cannot Scan: For two-sided scanning
Brother Cannot Scan means for two-sided scanning, the loaded document is too long or outside the supported dimensions. This guidance is specific to Current Brother color-laser duplex-scan platform and the ADF / Document / Feeder subsystem. Remove the original.
Error meaning
For two-sided scanning, the loaded document is too long or outside the supported dimensions.
This interpretation is tied to the reviewed family/platform and subsystem. Do not reuse the visible code by itself on another printer family.
Applies to
Current Brother color-laser duplex-scan platform
- DCP-L3560CDW
- MFC-L3720CDW
- MFC-L3755CDW
- MFC-L3760CDW
- MFC-L3780CDW
- MFC-L8340CDW
- MFC-L8390CDW
Common formatting
These are lookup or formatting aliases for this reviewed condition, not separate pages.
- Cannot Scan
- CANNOT-SCAN-DOCUMENT-LONG
What usually causes it
- This “Cannot Scan” condition is specifically about an original that is too long or outside supported dimensions for two-sided ADF scanning. It is not the generic “Cannot Scan ##” mechanical service message.
- The exact reviewed condition is: For two-sided scanning, the loaded document is too long or outside the supported dimensions.
- Remove the original, check its dimensions and condition, and use a supported document size for duplex feeder scanning. For an oversized original, use the scanner glass or another supported workflow if available.
What to try
Check the condition this code actually names
Remove the original, check its dimensions and condition, and use a supported document size for duplex feeder scanning. For an oversized original, use the scanner glass or another supported workflow if available.
Keep the test focused
Change only the setting, supply, paper path, or component named above. Leave unrelated network, driver, and service settings alone so the retest tells you something useful.
Run a controlled confirmation test
Test with a few normal-size pages through the feeder. If they scan correctly, retry the original job using a supported size/method.
After each corrective action
Retry the original operation that produced Cannot Scan. If it works, stop there rather than moving into unrelated troubleshooting.
If the code returns
If normal-size pages also fail, note where they stop and whether one-sided ADF scanning works, because the problem is no longer explained by document length alone.
When service may be needed
Do not force long originals through the feeder or dismantle the ADF. Persistent failures with supported originals require service.
Continue with guided troubleshooting
If the printer still is not working after the reviewed checks, carry this verified error context into the guided troubleshooter.
Related information
Verified source
Brother Error and Maintenance Messages. Meaning and troubleshooting are paraphrased for this reviewed scope.