Brother Printer Error Code 85 — What It Means & How to Fix It

What Does This Error Mean?

Error code 85 on your Brother printer means the drum unit (imaging unit) has reached its rated end of life and needs to be replaced. The drum is the cylindrical component that transfers toner onto the paper. Brother printers track drum usage and alert you when the drum is worn out. Printing quality will decline and eventually the printer will stop printing.

Affected Models

Brother HL-L series laser printers
Brother MFC-L series all-in-one
Brother DCP-L series
Most Brother monochrome and color laser printers

Common Causes

The drum unit has printed its rated maximum number of pages and is at end of life
The drum was not reset after a previous replacement, so the counter is incorrect
Heavy printing use has worn the drum faster than normal
Print quality issues (streaks, spots) caused the drum to be flagged early
The drum counter was never reset after a previous drum installation

How to Fix It

Purchase a new drum unit compatible with your specific Brother printer model. Check your printer's label or manual for the correct drum part number.

Do not confuse the drum unit with the toner cartridge — they are separate parts. The drum is larger and the toner cartridge fits inside it on many Brother models.
Open the front cover of your Brother printer. Remove the drum and toner assembly.

On most Brother printers, you push a green tab to separate the drum from the toner cartridge.
Separate the old drum unit from the toner cartridge. Install the toner cartridge into the new drum unit.

You can reuse your existing toner cartridge if it still has toner — you only need to replace the drum.
Slide the new drum and toner assembly back into the printer. Close the front cover.

Make sure the assembly is fully seated — it should click or sit flush with no resistance.
Reset the drum counter: press OK or Menu on the printer, navigate to Machine Information or Reset Menu, and select Drum Reset.

The exact menu path varies by model — consult your printer's manual for the drum counter reset procedure.

When to Call a Professional

Error 85 is user-serviceable — you can replace the drum unit yourself. Brother drum units are widely available at office supply stores and online. A technician is not needed for this repair. If the error persists after installing a new drum and resetting the counter, contact Brother support.

Frequently Asked Questions

How do I know if I need to replace the drum or just the toner?

If your print quality shows vertical streaks, spots, or uneven density across the full width of the page, the drum likely needs replacement. If prints are just light or faded uniformly, the toner is running low. Error 85 specifically means the drum counter has hit its limit.

How many pages should a Brother drum unit last?

Most Brother drum units are rated for approximately 12,000–30,000 pages depending on the model. Heavy-coverage printing (lots of graphics and dense text) wears the drum faster. Light document printing extends drum life beyond the rated figure.

What happens if I keep printing with a worn drum?

Print quality will gradually worsen — you will see streaks, spots, or uneven toner distribution. Eventually the printer may stop and refuse to print at all. A worn drum can also accelerate wear on the fuser unit, leading to more expensive repairs.