What Toner Does the Brother MFC-L3750CDW Use?

Quick answer: The Brother MFC-L3750CDW uses Brother TN223 (standard) or Brother TN227 (high-yield) toner cartridges in black, cyan, magenta and yellow. It also uses a separate DR223CL drum set, a BU223CL belt unit and a WT223CL waste toner box — four different consumable families in total. For most owners the TN227 high-yield 4-pack is the right buy.

Brother MFC-L3750CDW Toner Cartridges at a Glance

The Brother MFC-L3750CDW is a colour laser, so it takes four cartridges: one black plus cyan, magenta and yellow. All four are consumed independently, and on a colour laser the three colour cartridges drain even when you think you are printing black-only documents — company logos, coloured hyperlinks and shaded table headers all pull from them. The MFC-L3750CDW is a full colour all-in-one with an automatic document feeder and fax. It shares its entire consumable set with the rest of the L3xxx range.

Standard vs. High-Yield: Which One Should You Buy?

Almost everyone with a Brother MFC-L3750CDW should be buying the high-yield TN227 black rather than the standard TN223 black. The high-yield cartridge is physically the same size and installs identically — it is simply filled with more toner. At roughly 3000 pages versus 1400, it prints about 2.1x as much for a price that is nowhere near 2.1x higher, which is why the cost per page always lands in its favor.

The only reason to choose the standard cartridge is if you print so little that a cartridge would sit in the machine for years. Toner is a dry powder and does not dry out the way inkjet ink does, so even very light users are usually better off with the high-yield version. On the colour cartridges the gap is narrower — roughly 1,300 pages for a TN223 against 2,300 for a TN227 — but the high-yield still wins on cost per page.

To run the math on your own printer, our Printer Ink Cost Calculator will show you the cost per page for any cartridge price and yield combination.

The Four Consumables You Actually Need to Budget For

This is where colour lasers surprise people. Toner is only the first of four parts, and the other three are easy to forget until the printer stops:

• Toner cartridges (TN223 / TN227) — four of them, replaced most often.
• Drum unit (DR223CL) — a set of four drums, roughly 18,000 pages each. Sold separately from toner.
• Belt unit (BU223CL) — around 50,000 pages. Transfers the image from the drums to the paper.
• Waste toner box (WT223CL) — around 50,000 pages. Collects excess toner; must be replaced, not emptied.

The good news is that only the toner comes due regularly. If you print a few hundred pages a month, the drum will last years and the belt and waste box may well outlast the printer. But it is worth knowing they exist before the machine asks for one.

Castle Ink stocks a compatible DR223CL drum unit alongside the toner.

What Actually Ships in the Box

New Brother MFC-L3750CDW units include starter cartridges rated at roughly 1,000 pages each — below even a standard TN223. Expect the first low-toner warning sooner than the spec sheet might suggest, and treat the in-box supplies as a trial rather than a full set.

How to Replace the Toner in the Brother MFC-L3750CDW

1. Open the front cover and pull the drum-and-toner drawer straight out until it stops. All four cartridges sit in this one tray.
2. Identify the cartridge that needs replacing by its colour label and press down the green lock lever beside it.
3. Lift the used toner cartridge up and out of the drum unit. The drum stays in the drawer.
4. Unbox the new cartridge, rock it gently from side to side several times, and remove the orange protective cover.
5. Lower the new cartridge into the matching colour slot until the green lever clicks back into place.
6. Slide each of the four green cleaning tabs on the drum unit firmly left and right several times, returning each to its home position.
7. Push the drawer fully back into the printer and close the front cover.
8. Wait for the calibration cycle to finish, then print a colour test page.

If colours look off after a change, run a manual calibration from Menu > Printer > Calibration > Calibrate. It is worth doing any time you swap more than one cartridge at once.

Troubleshooting Tips

Colour cast or wrong colours after a toner change: Run a calibration, then a registration, from the printer's menu. Colour lasers need to re-learn where each drum sits relative to the others after a cartridge swap.

Repeating marks in one colour only: That points to a single drum in the DR223CL set rather than the toner. Note which colour and at what interval the mark repeats.

"Toner Low" for a colour you never print: Normal. The printer uses small amounts of all four colours for calibration and for composite blacks. It is not a fault.

New compatible cartridge not recognised: TN223 and TN227 cartridges are chipped. Confirm you bought the "with chip" North American version, then power-cycle the printer with the cover opened and closed once.

Grey background or smearing across the whole page: Usually the drum or a waste toner box nearing capacity rather than the toner cartridge.

Which Other Printers Use the Same Cartridge?

The Brother TN223 / TN227 cartridge set is used across a wide range of machines, which is good news for buyers — high production volume keeps compatible cartridge prices low and availability high. If you run more than one of these printers, a single cartridge type covers all of them:

• Brother HL-L3210CW
• Brother HL-L3230CDW
• Brother HL-L3270CDW
• Brother HL-L3290CDW
• Brother MFC-L3710CW
• Brother MFC-L3750CDW
• Brother MFC-L3770CDW

Always confirm the cartridge number printed on the supply you are replacing before ordering, since manufacturers occasionally use similar-looking numbers across families. You can also look your machine up on our Find Ink by Printer directory, which lists the correct cartridge for several hundred printers.

Compatible vs. OEM: What You're Actually Buying

The single biggest cost decision for a Brother MFC-L3750CDW owner is whether to buy Brother-branded cartridges or compatible ones. It is worth understanding what the difference actually is, because the marketing on both sides tends to obscure it.

An OEM cartridge is made by Brother and sold under its brand. A compatible cartridge is newly manufactured by a third party to the same physical and electrical specification. A remanufactured cartridge is an original shell that has been collected, stripped, cleaned, fitted with new wear parts and refilled. All three will print on a Brother MFC-L3750CDW; what varies is price, consistency and who stands behind it.

The honest summary is that quality in the compatible market is uneven, and that is exactly why the seller matters more than the label. A cheap cartridge from a marketplace listing with no return path is a gamble. Castle Ink tests Brother TN223 and TN227 cartridges individually before they ship and backs every one with a replacement-or-refund guarantee, which is what turns a 50–70% saving from a risk into a straightforward decision.

One myth worth putting to rest: using a compatible cartridge does not void your printer warranty. In the United States, the Magnuson-Moss Warranty Act prevents a manufacturer from conditioning warranty coverage on the use of its own consumables. A manufacturer would have to demonstrate that the third-party cartridge itself caused the specific failure being claimed.

How to Make a Cartridge Last Longer on the Brother MFC-L3750CDW

Toner yields are quoted at 5% page coverage, which is a fairly sparse business letter. Real documents are often denser than that, which is why so many people feel their cartridges run out early. A few settings changes genuinely stretch a cartridge:

• Print in greyscale by default. On a colour laser this is the single biggest saving available. Set greyscale as the default in your driver and switch to colour only when you need it — otherwise every logo, hyperlink and shaded table header quietly draws from three cartridges you are paying for.
• Use draft or toner-save mode for internal documents. It reduces toner density and can extend a cartridge noticeably. Reserve full-quality output for anything leaving the office.
• Print duplex. It does not save toner, but it halves paper use, and on most machines it is a one-time driver setting.
• Rock the cartridge when the low warning first appears. Removing the cartridge and tilting it gently end to end redistributes the remaining powder and commonly yields another hundred pages or more.
• Do not print a test page after every job. Configuration and status pages are full-coverage prints and add up faster than people expect.
• Choose a smaller, lighter font for drafts. Moving from a 12pt heavy serif to an 11pt lighter face measurably reduces coverage across a long document.

Ignore advice to store cartridges in a freezer or to drill and refill them yourself. Neither helps, and both are good ways to ruin a cartridge and make a mess.

Official Brother MFC-L3750CDW Resources

• Brother MFC-L3750CDW support page
• Brother support and driver downloads
• How to recycle used cartridges

Bottom Line

The Brother MFC-L3750CDW is a capable colour laser for a small office, and the running costs are reasonable as long as you buy the TN227 high-yield set rather than the standard TN223, and treat the drum, belt and waste box as separate, much rarer purchases. A compatible four-pack from Castle Ink typically costs less than a single OEM colour cartridge, which is where the real saving on a colour laser comes from.

Frequently Asked Questions

What toner does the Brother MFC-L3750CDW use? Brother TN223 (standard) or TN227 (high-yield) cartridges in black, cyan, magenta and yellow, plus a separate DR223CL drum set, BU223CL belt unit and WT223CL waste toner box.

Can I mix TN223 and TN227 cartridges? Yes. The printer does not care whether the four cartridges are the same capacity, so you can run a high-yield black alongside standard colours if that suits how you print.

Do I need to replace the drum when I replace the toner? No. The DR223CL drums last roughly 18,000 pages each — several toner cartridges' worth. Replace them only when the printer asks or when a print defect survives a new cartridge.

Why are my colour cartridges running down when I only print black text? Colour lasers draw small amounts of cyan, magenta and yellow during calibration cycles, and many documents contain colour you do not notice — logos, hyperlinks, table shading. Setting your driver to greyscale for routine documents helps.

Does compatible toner void the Brother MFC-L3750CDW warranty? No. In the US, the Magnuson-Moss Warranty Act prevents a manufacturer from voiding a warranty purely because a third-party consumable was used.

What is the waste toner box and can I empty it? It collects surplus toner from the printing process. It is not user-serviceable and must be replaced rather than emptied — but at around 50,000 pages, most owners will replace it rarely if ever.

What other Brother printers use TN223 and TN227? The same cartridges fit the HL-L3210CW, HL-L3230CDW, HL-L3270CDW, HL-L3290CDW, MFC-L3710CW, MFC-L3750CDW and MFC-L3770CDW.

Written and reviewed by William Elward — Founder of Castle Ink, 20+ years in the printer and ink industry. Last updated August 2026.

Shop Compatible Toner at Castle Ink

Save 50–70% on replacement toner for the Brother MFC-L3750CDW. Every cartridge is individually tested before it ships and backed by Castle Ink's compatibility guarantee — if it does not work in your printer, we replace it or refund you.

• Brother TN227 high-yield toner 4-pack (BK/C/M/Y, compatible)
• Brother TN223 standard-yield toner 4-pack (BK/C/M/Y, compatible)
• Brother DR223CL drum unit (compatible)
• Shop all Brother toner at Castle Ink

Buy the Brother MFC-L3750CDW on Amazon: Brother MFC-L3750CDW on Amazon

See also: Find Ink by Printer | Printer Ink Cost Calculator | Best Printers Buying Guide