Frequently Asked Questions
Why do offices buy this cartridge three at a time?
Rotation. One cartridge goes into the machine, two stay sealed on the shelf, and the shelf pair becomes the reorder signal — when the last sealed unit goes in, it is time to order again. The box is built around the 370AR011 / TK-421 code pair, so every unit in the rotation is identical.
Is each cartridge in the box the full 15,000-page size?
Yes. Every one of the three is the complete cartridge rated at 15,000 pages; nothing in this pack is a reduced or starter version. The rating belongs to each unit on its own, which is what makes the rotation predictable on a KM-2550.
Can the three cartridges be split between two machines?
They can, if both machines take the TK-421. The units are individually sealed, so one can go to a second copier down the hall while the rest stay in the cupboard. Just keep track of which shelf each machine draws from so the reorder signal still works.
How should the spares be stored so the rotation stays honest?
Sealed, flat, indoors at room temperature, away from radiators and damp. A small date note on the box when it arrives helps: always fit the oldest sealed cartridge first, and the stock turns over in the order it came in.
What if one cartridge out of the three turns out faulty?
It is handled on its own. Each unit is covered individually under the 1-year warranty and 1-year free returns, so a single bad cartridge is replaced or refunded without sending the rest of the pack back. Keep the faulty unit aside and contact us Mon–Fri, 9 AM to 5 PM CST.
Is there anything to set up or program when fitting one?
No. Lift the old unit out, rock the fresh one gently side to side, slide it in until it seats, and close the cover. The machine recognizes the cartridge and returns to service on its own — no menus, no resets, no technician visit.
What does each cartridge in the three-pack work out to?
The pack is $208.70, so each 370AR011 / TK-421 unit stands at $69.57. Across the three cartridges the box holds 45,000 rated pages, putting the running cost near 0.46 cents per page at standard coverage. That per-unit figure is the honest way to compare pack sizes: the cartridge itself never changes, only the price of committing to three at once improves.
How can I check whether a cartridge really delivered its rated 15,000 pages?
Note the KM-2550's page counter on the day a cartridge goes in, and again on the day it comes out. The difference is that unit's true yield in your building. Jot the figure on the box before it leaves and, by the third cartridge, you have your machine's real appetite measured — usually more useful for planning than the rating, because it already includes your coverage and your work mix.
The second cartridge in the rotation prints pale in its first week — what comes first?
Start with the fitting, not the verdict. Take the unit out, rock it gently side to side to level the powder, and slide it back until it seats, then run a short batch. Powder settles in storage and transit, and a fresh TK-421 often evens out within a few pages. If it stays pale after that, it is a faulty unit, handled on its own under the warranty while the third cartridge keeps the machine running.
As the rotation empties cartridges, what happens to the spent ones?
Each empty goes into the packaging its replacement came out of and onto a separate spot from the sealed stock, so nobody ever grabs a spent unit thinking it is the spare. When the rotation has produced a few, they can be recycled or disposed of together. Keep one exception apart: a cartridge that failed rather than emptied stays identifiable until its individual claim is closed.
About This Kyocera TK-421 Black Toner 3 Pack
At $208.70, this 3 pack of compatible black cartridges — order code 370AR011, the TK-421 — is sized for one hard-working machine kept on a simple rotation: one fitted, two sealed in reserve, each rated at 15,000 pages. Orders leave our IL, PA, GA and CA warehouses, and the delivery and returns terms are set out on our shipping & returns page. Offices standardising on this cartridge across several models can browse the wider Kyocera-Mita catalogue on our site.
See Compatible Printers
Read more about our ink!
