Brother Printer Error Code 9C — What It Means & How to Fix It

What Does This Error Mean?

Brother error 9C means the drum unit has stopped functioning and must be replaced before printing can continue. Unlike error 93, which is a warning, error 9C is a hard stop — the printer will not print at all until a new drum unit is installed. The drum unit has reached or exceeded the end of its rated lifespan.

Affected Models

Brother HL-L2350DW
Brother HL-L2390DW
Brother MFC-L2710DW
Brother MFC-L2750DW
Brother DCP-L2550DW

Common Causes

The drum unit has exceeded its rated page yield and must be replaced
The drum unit was installed without resetting the drum counter, causing premature end-of-life detection
The drum counter was never reset after a previous drum replacement, so it has already timed out
A third-party drum unit without a compatible chip is not being recognized correctly by the printer
The drum unit's physical coating has been damaged by exposure to direct sunlight or by a severe paper jam

How to Fix It

Purchase a replacement drum unit for your specific Brother printer model. The model number for the drum unit is printed on the drum itself or listed in your printer's user manual.

Common Brother drum units include the DR-730, DR-630, and DR-420. Using the wrong drum unit model will cause fitting and compatibility issues.
Open the front cover of the printer. Remove the toner and drum assembly by pulling it out firmly. Separate the toner cartridge from the drum by pressing the green locking tab and sliding the cartridge out.

Keep the toner cartridge — you transfer it to the new drum unit. Unless the toner is also empty, you do not need a new toner cartridge.
Remove the new drum unit from its packaging. Remove the protective cover from the drum surface. Insert the toner cartridge into the new drum unit until it clicks into place.

Never touch the green or silver drum surface with your fingers — oils from your skin can damage the coating and cause permanent print defects.
Slide the toner and new drum assembly back into the printer. Close the front cover until it clicks shut.

The assembly must slide fully into the printer with no gaps. If it does not go in smoothly, check that the toner cartridge is correctly seated in the drum unit.
Reset the drum counter immediately after installing the new drum. Open the front cover while the printer is on. Press and hold the GO or OK button for several seconds until the display confirms the reset. Close the cover.

This step is critical. Without the reset, error 9C will reappear on the next startup. The exact button sequence varies slightly by model — check your manual if the printer does not respond.

When to Call a Professional

Error 9C does not require a repair professional — it requires a new drum unit. Drum units for popular Brother models are widely available and easy to install. If you have already replaced the drum and reset the counter and error 9C still shows, the drum counter reset may not have completed correctly. Try the reset process again.

Frequently Asked Questions

I replaced the drum but error 9C is still showing. What went wrong?

The most common cause is forgetting to reset the drum counter after installing the new drum. The printer stores the drum usage count in memory — installing a physical new drum does not automatically reset this counter. Open the front cover with the printer on, hold the OK or GO button for 3 to 5 seconds, and follow the on-screen prompt to reset.

Can I temporarily override error 9C to print a few more pages?

No — error 9C is a hard stop. Brother printers will not print at all once error 9C is active. There is no bypass or override for this specific error. The only solution is to install a new drum unit and reset the counter.

How often will I need to replace the drum unit?

Brother drum units are rated for approximately 12,000 to 15,000 pages, depending on the model. For a home user printing 100 pages a month, a drum unit will last about 10 years. For a small office printing 500 pages a month, expect to replace it every 2 to 3 years. One drum unit typically outlasts 3 to 5 toner cartridges.