Brother MFC-J4335DW
scanner is not working.
Brother MFC-J4335DW scanner is not working? When printing works but scanning does not, the scanner usually needs its own software, permission, or network path checked. On this inkjet model, check Brother Mobile Connect, LC406 cartridges, ADF feeding, and duplex path first.
Try these in order.
Stop as soon as the printer behaves. Each step removes one likely cause without changing settings you may need later.
- The scan app cannot find the printer
- A scan starts and then stops
- Copying works but scanning to a computer does not
- Brother MFC-J4335DW behavior points back to Brother Mobile Connect, LC406 cartridges, ADF feeding, and duplex path.
- 01
Test a copy from the printer
Place one page on the glass or feeder and make a copy. A successful copy proves the scanner hardware can capture an image. On the Brother MFC-J4335DW, use Brother Mobile Connect for this check.
Expected result: A clean copy comes out, proving the scanner hardware works.
- 02
Use the full manufacturer app
Open the official scanning utility rather than the generic print dialog, then select the exact model instead of a duplicate entry.
Expected result: The scan app detects and connects to the printer.
- 03
Reconnect the local path
For USB, move the cable directly to the computer. For Wi-Fi, confirm the computer and printer are on the same primary network.
Expected result: The scanner appears in the app and accepts a scan job.
Match your symptom, jump to the right fix.
If: A copy works but scanning to the computer fails
Then: Focus on the scan software, permissions, and network discovery.
If: The scan app cannot find the printer
Then: Confirm both devices are on the same network and the full package is installed.
If: A scan starts then stops
Then: Check the USB cable or Wi-Fi strength and try the official app instead of a generic one.
Usually one of these.
- Brother Mobile Connect, LC406 cartridges, ADF feeding, and duplex path is the model-specific checkpoint to verify first.
- The scan utility or full driver package is missing.
- The computer and all-in-one are on different networks or the firewall is blocking discovery.
- The scanner lid, document sensor, or USB connection is not being detected.
Move to the deeper fix.
Install the full software package
Remove a print-only or generic driver and install the official full package that includes scanning and device discovery.
Expected result: The scan utility is available and detects the printer.
Check firewall and permissions
Allow the official scan utility through the operating system firewall and grant it access to files or local network devices when prompted. Use the official Brother support page for the exact Brother MFC-J4335DW package before changing firmware or resetting the device.
Expected result: The scan app reaches the scanner without being blocked.
- Do not assume the scanner is broken if a copy works; the hardware is fine and the computer path is the issue.
Before you reset everything.
Why can I print but not scan?
Printing and scanning use different drivers and services. A print-only driver can work while the scan utility is missing or disconnected. On this model, start with Brother Mobile Connect and the official support instructions.
Is the scanner broken if copying works?
Usually not. A successful copy proves the scanner can capture an image; focus on the computer software, permissions, and network discovery.
Do I need a special driver to scan?
Yes. Use the full manufacturer package that includes the scan utility, not a print-only or generic driver.
Brother MFC-J4335DW facts that change the fix.
Connectivity and operating systems
- Connection
- Wi-Fi · USB
Use the exact model guide.
These links point to the manufacturer resources for this model. Use the manual for panel symbols and the driver page for software or operating-system issues.