What Toner Does the Brother MFC-7840W Use?
Last Updated:Shopping for this printer? See all Brother TN360 Toner Cartridges – TN360 & TN330 → Ships same day by 4 PM ET, 1-year guarantee.
Correction (October 2026): an earlier version of this guide called the TN-360 the standard cartridge. The TN-360 is Brother's high-yield cartridge (about 2,600 pages). The standard cartridge is the TN-330 (about 1,500 pages), and both fit the MFC-7840W.
The Brother MFC-7840W is a monochrome laser printer that uses the TN-330 (standard, about 1,500 pages) or TN-360 (high yield, about 2,600 pages) toner cartridge and the DR-360 drum unit. The toner produces the printed image while the drum transfers it to paper — they are two separate consumables on this model.
CastleScore · October 2026
69/100 — Situational
Brother MFC-7840W
| Pillar (weight) | Score | What it is based on |
|---|---|---|
| Owner ratings (28%) | — | No retailer rating with enough reviews to use. |
| Expert reviews (20%) | — | No published numeric expert score we could verify. |
| Cost per page (18%) | 92 | About 1.9¢ per page all-in with our compatible TN360 toner (2,600 pages) and DR360 drum (12,000 pages). |
| Reliability (18%) | 87 | Most-reported problems: repeated paper jams at drum unit/back door on aging units |
| Features (11%) | 79 | Print, copy, scan, document feeder, fax, Wi-Fi, Ethernet, fast (20+ ppm). No auto two-sided printing, no touchscreen. |
| Value (5%) | — | Running cost and owner satisfaction |
Limited data: We could not find enough owner ratings or published expert scores for this printer, so those weights are spread across the other pillars. With neither owner ratings nor a published expert score, we cap this printer at 69 (Situational) until better data is available.
Discontinued. We found the MFC-7840W only in Brother's 2011 catalog, not in Brother's current U.S. lineup, and could not confirm a direct successor. This score rates it for current owners.
CastleScore is Castle Ink’s own editorial rating, built from retailer star ratings, expert reviews, real cost per page and owner complaint patterns, checked October 10, 2026. It is not a customer review. See every ranked printer or how the score works.
The toner, pictured
TN360 Toner
TN330/TN360 Jumbo
DR360 DrumOur own compatible toner, photographed in-house.
Brother TN360 Toner & Drum at a Glance
| Consumable | Part Number | Page Yield | Type |
|---|---|---|---|
| Black Toner | TN-330 | ~1,500 pages | Standard |
| Black Toner | TN-360 | ~2,600 pages | High yield |
| Drum Unit | DR-360 | ~12,000 pages | Lasts about 4–5 TN-360s or 8 TN-330s |
TN-330 and TN-360 also fit other Brother models, including the HL-2140, HL-2150N, HL-2170W, DCP-7030, DCP-7040, MFC-7340, and MFC-7440N, making it a high-volume cartridge family that is widely stocked in genuine, remanufactured, and compatible versions.
How to Replace the Toner and Drum
- Power on the Brother MFC-7840W and open the toner access cover.
- Pull out the toner/drum assembly as a single unit.
- To replace just the toner, push the green lock lever and separate the toner from the drum, then snap in the new TN360 cartridge.
- To replace the drum, install the existing toner into the new DR-360 drum unit.
- Slide the assembly back into the printer. If you replaced the drum, reset the drum counter before you close the cover: press Clear, then 1, and close the cover when the display shows Accepted.
Troubleshooting Tips
"Replace Toner" or low-toner warning: A new TN-330 or TN-360 resets the toner count by itself through the reset gear on the cartridge, so there is no front-panel toner reset to do. If the message stays after a new install, the usual cause is a refilled or remanufactured cartridge without a new reset gear, or a dirty sensor window.
Faded or streaky prints: Gently rock the toner cartridge side-to-side to redistribute toner, then reinstall. If streaks remain, clean the corona wire by sliding the green tab back and forth several times.
Paper jams or smudges: Inspect the paper path and pickup roller for wear. Replacing worn rollers and keeping the printer dust-free prevents repeated print-quality issues.
What MFC-7840W owners ask
These are the questions that come up most for this printer on retailer Q&A pages, Brother's support pages and owner reviews, answered in our words.
Is there a cheaper, smaller toner than the TN-360?
Yes. Brother's standard-yield TN-330 fits too and is rated for about 1,500 pages. The TN-360 is the high-yield version at about 2,600 pages.
How often does the drum need replacing?
Brother rates the DR-360 drum at about 12,000 pages. That is roughly four or five TN-360 cartridges, or about eight TN-330s, at rated yields.
How do I clear "Replace Drum" after fitting a new DR-360?
With the printer on, open the front cover and press Clear. When the display asks about replacing the drum, press 1, then close the cover once it shows Accepted.
Will it connect to a 5 GHz Wi-Fi network?
No. Its wireless is 802.11b/g, so it needs a 2.4 GHz network. It also has Ethernet and USB ports.
MFC-7840W quirks worth knowing
- There is no chip on TN-330 or TN-360 cartridges. A small reset gear on a new cartridge tells the printer a fresh one is in and zeroes the page count. Starter cartridges have no reset gear, and a refilled cartridge needs a new one.
- Brother originally gave the TN-330 and TN-360 different gear trains so the printer could tell standard from high yield. It later moved both to one gear style.
- The fax side is stronger than on the USB-only MFC-7340: a 33.6K bps Super G3 modem and 32MB of memory that holds about 600 fax pages, against 14.4K and 16MB.
- On older units, jams that keep happening at the drum or rear door often come from a worn fuser rather than the drum, according to a repair technician's diagnosis.
Frequently Asked Questions
Q: What toner does the Brother MFC-7840W use?
A: The TN-330 (standard, about 1,500 pages) or the TN-360 (high yield, about 2,600 pages), with the separate DR-360 drum unit.
Q: Can I use compatible TN360 cartridges?
A: Yes. TN-330 and TN-360 cartridges have no authentication chip, so the printer doesn't check who made them. What matters is the reset gear: a new compatible cartridge needs one, or the toner message can linger.
Q: Where can I buy TN360 toner?
A: Browse TN360 cartridges at Castle Ink. We sell compatible TN360 high-yield toner and a compatible DR360 drum. For a genuine TN-330 or TN-360, buy Brother's own.
Other printers that use TN330 and TN360 toner
Brother HL-2140 · Brother MFC-7340 · Brother HL-2170W · Brother HL-2150N · Brother MFC-7440N · Brother DCP-7030 · Brother DCP-7040
More Brother ink guides: Brother DCP-L2640DW · Brother MFC-L2820DW · Brother HL-L2460DW · find any printer
Replacing it? Our highest-rated alternatives
- Brother HL-L2460DW — CastleScore 90
- Brother MFC-L2820DW — CastleScore 90
- Brother HL-L5210DW — CastleScore 89
Sources
Ratings and prices were checked on October 10, 2026 and will change over time.
Need replacement Brother TN360 Toner Cartridges – TN360 & TN330? Shop Brother TN360 Toner Cartridges – TN360 & TN330 at Castle Ink. Compatible, up to 70% less than OEM, and shipped the same day when you order by 4 PM ET.