LASERJET 4240
Designed for workgroups, the LaserJet 4240 is a 2002-era workgroup laser with a reputation for simply working — its standing rests on consistent output rather than gimmicks. Its engine was built around the HP 42X cartridge, the Q5942X, the high-yield member of the 42A family, whose standard-yield cartridge is the Q5942A. Keep a spare on the shelf and the 4240 never leaves a department hanging.
This is the kind of printer that becomes furniture: installed, shared, and forgotten until the toner light comes on. That makes its supply routine the whole ownership story. A workgroup machine drinks more toner than a personal one, and the high-yield cartridge exists precisely for that pattern — fewer changes, longer stretches between interventions, and less time spent thinking about a printer at all.
Toner Cartridges for LASERJET 4240
| Cartridge | Color | Page Yield |
|---|---|---|
| Compatible HP 4350N (4350N) Toner Cartridge Black (as labeled) | Black | See product page |
The one listing stocked on this page is cataloged under the 4350N model name and carries no cartridge code in its title. The 4240's own cartridges are the Q5942A and the high-yield Q5942X — match the code on the cartridge you are replacing before ordering.
Which cartridge should you buy?
Within this printer's own family the decision is standard versus high yield. The Q5942A covers lighter, intermittent workgroup use; the Q5942X carries the same fit with a larger fill, and for a shared machine it is usually the better economy — each change is an interruption for everyone on the queue, so making changes rarer is worth more than the per-cartridge difference suggests. Whichever you choose, order by the code printed on the cartridge coming out of the printer, not by a listing's model name.
Chip, toner and everyday use
Fitting a cartridge is a two-minute job: power the printer on, open the cartridge door, slide the old unit out, remove the seal and packing clips from the new one, insert it firmly, close the door, and print a test page to confirm. Toner powder keeps for a long time, but a cartridge stored for years can develop problems, so rotate spares rather than stockpiling deeply, and keep them sealed in a cool, dry place. Rated yields assume 5% coverage; a workgroup printing dense documents will cycle through cartridges faster than the rating implies.
Frequently Asked Questions
Which toner cartridges work with the LASERJET 4240?
The Q5942A (standard yield) and the Q5942X (high yield) are the cartridge codes for the LASERJET 4240. Checking the label on the old cartridge is the fastest way to confirm.
Do Q5942X cartridges for the LASERJET 4240 go bad over time?
Toner powder stays usable for a long time, but cartridges kept for years can develop problems — install spares within a couple of years and leave them sealed until needed. The printer may flag a very old cartridge.
How do I install a replacement Q5942X cartridge in the LASERJET 4240?
With the printer on, open the cartridge door and slide the old cartridge out. Remove the seal and packing clips from the new cartridge, insert it firmly, close the door, and print a test page to confirm.