What Toner Does the Brother MFC-7820N Use?

by Lauren Elward Last Updated: November 9, 2026

Quick answer: The Brother MFC-7820N uses Brother TN350 black toner, rated at about 2,500 pages, and a separate DR350 drum unit, rated at about 12,000 pages. Brother made no high-yield version of TN350. Castle Ink sells a compatible TN350 for $39.95 and a compatible DR350 for $59.95.

The MFC-7820N is a networked laser all-in-one from Brother's mid-2000s lineup. It shares TN350 and DR350 with the IntelliFAX-2820, MFC-7420, HL-2040 and DCP-7020.

CastleScore · November 2026

69/100 — Situational

Brother MFC-7820N

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%)	86	About 2.1¢ per page all-in: 1.6¢ for our compatible TN350 toner (2,500 pages, $39.95) plus 0.5¢ for our DR350 drum (12,000 pages, $59.95).
Reliability (18%)	78	Separate toner and drum keep running costs down; rated for up to 10,000 pages a month. No recurring fault pattern in the sources we checked, though any unit this age has worn rollers.
Features (11%)	60	Print, copy, scan and fax; up to 20 pages per minute; 35-page document feeder; Ethernet, USB and parallel ports. No Wi-Fi.
Value (5%)	—	Not scored without owner ratings

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. Brother stopped selling the MFC-7820N years ago. TN350 toner and the DR350 drum are still sold.

CastleScore is Castle Ink’s own editorial rating, built from retailer star ratings, expert reviews, real cost per page and owner complaint patterns, checked November 9, 2026. It is not a customer review. See every ranked printer or how the score works.

The toner and drum, pictured

Our own compatible toner and drum, photographed in-house.

Brother MFC-7820N Toner and Drum at a Glance

Consumable	Brother part no.	Approx. yield	Castle Ink option
Black toner	TN350	~2,500 pages	Compatible TN350, $39.95
Drum unit	DR350	~12,000 pages	Compatible DR350, $59.95
High-yield toner	Not made by Brother	—	—

Toner yield is Brother's figure at 5% coverage. Drum life is approximate and depends on how many pages you print per job.

What Does MFC-7820N Toner Cost per Page?

There's only one toner size, so the math is short. Our compatible TN350 works out to about 1.6¢ a page ($39.95 ÷ 2,500). Add the drum, about 0.5¢ a page ($59.95 ÷ 12,000), and the all-in cost is about 2.1¢ a page. You'll go through roughly four or five toners per drum. Toner and drums at Castle Ink are newly manufactured compatibles. Orders placed by 4 PM ET ship the same day, and U.S. orders over $50 ship free.

Will Compatible Toner Work in the MFC-7820N?

Yes. TN350 has no chip, so a compatible cartridge drops into the drum and prints. The printer judges toner level with a light sensor, so the "Toner Low" message appears when the cartridge is nearly empty.

How Do I Replace the Toner in the MFC-7820N?

Open the front cover and lift out the drum and toner assembly.
Press down the blue lock lever on the drum and lift the old TN350 out.
Rock the new cartridge side to side five or six times and remove its protective cover.
Push the new cartridge into the drum until it clicks, then slide the blue corona-wire tab back and forth a few times and return it to its home position.
Put the assembly back in and close the front cover.

When you replace the drum instead, the drum counter has to be reset or the "Replace Drum" message stays on. On most units you do it with the front cover open by pressing Clear/Back, then 1 for Yes; check your manual if your screen shows something different.

Which Other Printers Use TN350?

Brother lists TN350 and DR350 for the DCP-7020, IntelliFAX-2820, IntelliFAX-2910, IntelliFAX-2920, HL-2040, HL-2070N, MFC-7220, MFC-7225N, MFC-7420 and MFC-7820N. The later TN360 used by the MFC-7340 looks close but does not fit.

What MFC-7820N owners ask

These are the questions that come up most for this printer, answered in our words.

Why does it still say "Replace Drum" after I changed it?

The printer counts drum pages, not drum wear. Reset the counter as described above after fitting a new DR350, and only then.

Why are my prints showing a vertical black line?

That is usually a dirty corona wire. Slide the blue tab on the drum back and forth a few times. If the line stays, the drum is likely worn.

Can it connect to Wi-Fi?

No. It has Ethernet, USB and a parallel port. For wireless printing, plug it into your router by Ethernet.

Is a TN350 "high-yield" worth it?

Brother never made one. Cartridges sold as 5,000-page TN350s are aftermarket overfills, so read the listing carefully.

MFC-7820N quirks worth knowing

It prints, copies, scans and faxes, with a 35-page document feeder.
Brother rates print and copy speed at up to 20 pages a minute.
Brother rates it for up to 10,000 pages a month.
Ethernet is built in, which is what the "N" in the model name means.

Frequently Asked Questions