SKU:

MFC-9840CDW

Printer Brand:

Brother

OEM Number:

TN115BK, TN115C, TN115M, TN115Y

Ink Color:

Black, Cyan, Magenta, Yellow

Page Yield:

Black:5,000 Color:4,000

Printer Type:

Laser Cartridge

Condition:

New Compatible

Frequently Asked Questions

Our MFC-9840CDW serves a whole family office over Wi-Fi — how do we keep its black supply from surprising us?

Go high-yield and keep one spare. Wireless machines collect jobs from every room and every laptop, so consumption is steady but invisible until the warning appears. This TN115BK's 5,000 pages at $44.92 (about 0.90¢ a page) lengthens the cycle, and a shelf spare covers the gap whenever the current cartridge finishes.

What printers does this cartridge fit?

It belongs to the TN115 platform: DCP-9040CN, DCP-9045CDN, HL-4040CDN, HL-4040CN, HL-4070CDW, MFC-9440CN and MFC-9450CDN

Different family members print very different things — how does that split across cartridges?

Homework, invoices and letters draw on black; the occasional photo-page or school project draws on the TN115C, M and Y cartridges (4,000 pages each). Each cartridge is replaced when its own work empties it, so one member's color project never forces a black purchase, or the reverse.

Does wireless printing from many devices change toner use?

Only by adding pages. Every device sends the same kind of job, and all monochrome output shares this one TN115BK. The cartridge does not care which laptop a page came from — which is exactly why capacity, not connectivity, is the right planning number.

When several supplies run low, what is the simplest restock?

The TN115 four-color set at $127.02 bundles this black with the three colors — one order refreshes the flagship completely. Otherwise, single replacements remain the rule, and the standard-yield TN110BK (2,500 pages) only makes sense if the machine's use drops sharply.

What guarantee backs the cartridge?

One-year warranty plus one-year free returns, as shown on the shipping and returns page. Orders ship from IL, PA, GA or CA warehouses; support works 9 AM–5 PM CST.

With several people printing, how do we make sure the spare is actually findable?

Give it a fixed, labeled home — one shelf or drawer that everyone in the household knows is the printer-supply spot, with the TN115BK kept sealed and flat inside it. Family offices lose more printing time to a spare nobody can locate than to the cartridge itself. A strip of tape on the box with the date it arrived also quietly shows how long a black cartridge lasts your household.

One person's printouts look fine and another's look washed out — whose pages should we trust?

Trust the comparison test: print the same simple text page twice. If both copies fade evenly, the TN115BK is running low no matter who sent the job — rock it gently side to side and the density usually returns for a while. Washed-out output that only appears on photo pages or graphics-heavy school projects is a different matter: those pages lean on the color cartridges and on coverage, not on the black supply that handles everyday documents.

Can we mix a standard TN110BK in now and then, or must we always buy the high-yield?

You can mix them over time. The MFC-9840CDW accepts the standard-yield TN110BK (2,500 pages) in the same black slot, so if the machine's workload drops — a student leaves, a project ends — a standard cartridge is a legitimate smaller commitment. Just know the trade you are making: half the pages between swaps. Most family offices return to the TN115BK once shared printing picks back up.

What should we do with the finished cartridge in a busy household?

Drop it straight into the new cartridge's box so stray powder stays sealed away, and keep a small collection spot with the printer supplies. When two or three empties have gathered, send them out together through an electronics-recycling or cartridge-return route. Batching them this way keeps the home office tidy and means the TN115BK that served everyone's printing does not end its life in household trash.

About This TN115BK for the MFC-9840CDW

The wireless flagship of the platform serves the most varied workload of all: an entire household's worth of desks. Its black toner should be the least of anyone's worries. With 5,000 pages at around 0.90¢ each, this TN115BK gives the MFC-9840CDW a long, quiet supply cycle that matches its always-on role. The rest of the set is catalogued under Brother toner.