the front 'drum' light is flashing but the 'ready' light is on, and it won't print my job.

Diagnosis

The Brother HL-L2350DW utilizes a separate toner cartridge and drum unit (DR230). The flashing 'Drum' LED while the 'Ready' LED remains solid is a specific warning state known as the "Drum Near End" notification. This occurs when the internal page counter for the DR230 drum unit reaches a predefined threshold (typically 12,000 pages), signaling that the organic photoconductor (OPC) roller is beginning to degrade. Unlike a "Drum End" error, which is a hard lockout, this is a soft warning. However, the printer's firmware often pauses the print queue to force the user to acknowledge the maintenance requirement. If you see this flashing light, the printer is essentially asking for confirmation that you are aware of the drum's wear before it continues to process data from the spooler. You can confirm this is the issue if the printer still responds to a "Test Print" from the physical buttons but refuses to process a USB or Wi-Fi document.

How to Fix It

To override the soft warning and force the printer to process your pending print jobs, follow this exact sequence:

1. Ensure the printer is powered on and the 'Ready' light is solid green.
2. Press the Go button exactly once. This acts as a manual acknowledgement of the drum life warning.
3. Wait 5 seconds. The flashing 'Drum' light may continue to blink, but the internal logic gate for the print queue should now be open.
4. Go to your computer and cancel the current stuck print job by right-clicking the document in the print queue and selecting 'Cancel'.
5. Resend the document to the printer.
6. If the 'Drum' light persists and prevents printing, perform a manual reset of the drum counter:
   • Open the front cover of the printer (the flap where the toner is housed).
   • With the cover open, press and hold the Go button for approximately 2 seconds.
   • Release the Go button.
   • Close the front cover firmly. This resets the DR230 page counter to zero.

If That Didn't Work

• Clear the Print Spooler: Sometimes the "Drum" warning causes the Windows Print Spooler to hang. Press Win+R, type services.msc, find "Print Spooler," right-click it, and select "Restart." This clears the communication bridge between the PC and the HL-L2350DW.
• Inspect the Corona Wire: A flashing drum light can sometimes be triggered by a dirty corona wire. Open the front cover, pull out the toner/drum assembly, and slide the green tab on the drum unit from left to right several times. Ensure the tab is clicked back into its home position (marked by a small arrow) before reinserting.
• Verify Drum Seating: If the drum unit is not seated perfectly flush against the rear gears, the sensor may trigger a flashing warning. Remove the assembly and firmly push it back into the chassis until you feel a distinct click on both the left and right sides.
• Replace the DR230 Unit: If you see vertical black streaks or "dots" repeating every 94mm on your pages, the drum is physically worn out. No amount of button-pressing will fix this; you must replace the DR230 drum unit.

Heads Up

• Don't confuse Toner with Drum: The TN630/TN660 is the powder; the DR230 is the roller. Replacing the toner will NOT stop the drum light from flashing.
• Avoid Over-Resetting: Resetting the drum counter is a temporary fix. If you reset the counter but don't replace the drum, you will eventually see ghosting or streaks on your documents.
• Clean the Corona Wire: Always slide the green cleaner tab after every toner replacement to prevent "backgrounding" (gray streaks across the page).
• Firmware Updates: Ensure your HL-L2350DW is updated via the Brother Utilities software, as some early firmware versions had "sticky" drum warnings that required a power cycle to clear.