Brother MFC-L6900DW Toner Cartridges
Your Brother MFC-L6900DW uses the TN-3420, TN-3440 and TN-3470 toner cartridges along with DR-3425 drum units. Ink Depot has been supplying reliable consumables for this printer since May 2016. Built for demanding office workgroups, this high-speed monochrome laser printer relies on dependable consumables to maintain busy print workflows. Switching from standard TN-3420 to high-capacity TN-3470 cartridges substantially reduces page-by-page expense during large document runs. Our 4.8 Google rating proves it: we consistently supply premium cartridges backed by rock-solid reliability.
Real-World Yield and Output Standards
Page yields for Brother Black toner cartridges are measured under standard ISO/IEC 19752 test criteria at 5% page coverage. Actual output varies based on document density, job length, and continuous batching, with high-volume text printing consuming toner faster than basic single-page office correspondence.
| Cartridge Number | Type | Colour | Page Yield | Cost Per Page |
|---|---|---|---|---|
| TN-3420 | Standard | Black | 3,000 | $0.058 |
| TN-3440 | High Yield | Black | 8,000 | $0.037 |
| TN-3470 | Extra High Yield | Black | 12,000 | $0.027 |
Cost Per Page = Total Cartridge Price ÷ Page Yield (at 5% coverage). Prices based on Genuine cartridges.
Understanding Drum Unit Replacement
The DR-3425 drum unit operates as an independent component from the toner cartridge, holding an estimated lifespan of 50,000 pages. While toner cartridges require regular replenishment, the drum unit outlasts several toner cycles before requiring replacement. Experience Tip: The DR-3425 drum unit is rated for 50,000 pages, meaning it lasts through roughly four super high-yield TN-3470 toner cartridges under standard operating conditions.
Choosing Between Genuine and Compatible Toners
For busy offices looking to manage printing costs, compatible TN-3440 and TN-3470 toners offer substantial savings while maintaining clear text definition. Under Australian Consumer Law, using compatible cartridges does not void your printer warranty. Read our comprehensive genuine vs compatible cartridge guide to decide which option best aligns with your workplace print demands.
Procurement Strategies and Shipping
High-volume text environments benefit most from super high-yield TN-3470 cartridges or multi-packs to minimise replacement frequency. Compatible options include a full money-back guarantee for complete peace of mind. Free delivery applies on all orders over $99. We dispatch quickly from warehouses in Perth, Brisbane, Sydney, Melbourne and Adelaide. Browse our complete range of Brother toner cartridges or review our returns policy for order details.
Professional Purchasing Tip
Always check whether print defects are caused by low toner levels or a worn drum unit before ordering replacements. Clear streaks running vertically down pages usually indicate drum wear rather than empty toner, saving you from replacing toner prematurely.
Frequently Asked Questions
Can I install a super high-yield TN-3470 toner if my Brother MFC-L6900DW came with a standard TN-3420?
Yes, the standard TN-3420, high-yield TN-3440, and super high-yield TN-3470 cartridges share the exact same external dimensions and locking mechanism. They fit into the exact same slot inside the DR-3425 drum assembly; the TN-3470 simply holds more toner powder inside.
Does replacing the TN-3470 toner cartridge automatically reset the DR-3425 drum counter?
No, toner cartridges and drum units track their lifespans independently within the printer software. Replacing a toner cartridge only resets the toner level indicator, whereas the DR-3425 drum counter tracks total page rotations over its 50,000-page operational lifecycle.
Why does my print density drop slightly before the printer signals a toner low warning?
In high-speed monochrome printing, heavy coverage jobs deplete fine toner particles unevenly. When printing dense text blocks continuously, redistributing the remaining powder by gently rocking the TN-3440 or TN-3470 cartridge horizontally can restore uniform print density until the replacement cartridge arrives.
