C7

OKI Type C7 is not a printer model — it is a high-capacity color toner family used by heavy-duty OKI printers such as the C9600 and C9800 series. The family has four cartridges: black 42918904, cyan 42918903, magenta 42918902 and yellow 42918901, and each one loads and is replaced separately. If your machine's documentation, or the cartridge you just removed, calls for Type C7, these are the numbers to match.

Printers in this class are bought for volume — long runs, large documents and color work that cannot wait on a desktop machine. A four-cartridge system suits that duty: the color a job consumes most can be replaced on its own, and a shelf spare of each color keeps a heavy-duty machine from standing idle over a single empty slot. The full set below also refreshes all four at once when a machine is being brought back to a known starting point.

Toner Cartridges for Type C7

Cartridge	Color	Page Yield
42918904	Black	See product page
42918903	Cyan	See product page
42918902	Magenta	See product page
42918901	Yellow	See product page
42918904, 42918903, 42918902, 42918901 — 4 Color Set	All four colors	See product page

Which cartridge should you buy?

Buy the single color that has emptied — that is the normal pattern with Type C7, since the four cartridges deplete at different rates depending on the work a machine does. The 4 Color Set is the better buy when several colors are low together, when a machine is new to you and its cartridge history is unknown, or when you keep a complete spare set for a machine that cannot be left waiting. There is no cost-per-page shortcut to calculate here: match the number on the cartridge you removed — 42918904, 42918903, 42918902 or 42918901 — and you have the right part. These compatible cartridges carry a 1-year warranty and 1-year returns.

Chip, toner and everyday use

Fit each cartridge into the slot for its color and let the machine register its chip before printing. A gentle side-to-side rock before installation levels the toner inside and helps the first pages come out even. If a low warning appears while pages still look right, treat it as the signal to order and keep printing in the meantime. On machines that run this hard, keep spares sealed, flat and away from heat, and replace a cartridge when output quality drops rather than stretching it — faded color discovered halfway through a long run costs more in reprints than the toner saved.

Frequently Asked Questions

What toner cartridges does Type C7 include?

Four: 42918901 (yellow), 42918902 (magenta), 42918903 (cyan) and 42918904 (black). Since each color loads separately, you only ever replace the one that is empty.

My printer warns toner is low, but pages still look good. Can I keep printing?

Yes — the low warning is an early heads-up, not a lockout. A gentle shake of the cartridge redistributes the remaining toner and usually buys more pages; order the replacement at the warning so it is on hand when quality actually drops.

My prints show thin white lines. Is the toner empty?

Usually not. Thin white lines down the page typically mean a dirty LED lens rather than an empty cartridge. Clean the four LED arrays inside the machine with a dry, lint-free cloth, then print a test page to confirm before replacing anything.