LaserJet M4345XSMFP

The LaserJet M4345XSMFP carries the full multifunction name of HP's solutions-configured M4345XS: a mid-2000s monochrome all-in-one that prints, copies and scans for offices whose document workflows were arranged around it. However the machine is configured, everything it prints runs through a single black cartridge, the 45A (Q5945A). Where the interval between toner orders matters, the same machine also accepts the maximum-yield 45X (Q5945X), a larger fill of the same cartridge design.

On a solutions-configured machine, scanning and copying usually share the workload with printing, and the M4345XSMFP sits where a whole workgroup's paper passes through it. That pattern is hard on supplies in a quiet way: nobody owns the machine, so nobody watches the toner gauge. A single-cartridge design keeps the response simple — when output fades, one cartridge type is on the shelf and it fits. Offices running several 4345-family machines benefit further, because the same cartridge serves the entire installed base.

Toner Cartridges for LaserJet M4345XSMFP

Five listings on this page sell the same cartridge fitting in different versions; the table below separates them.

Cartridge	Version	Color	Page Yield
Q5945A	Standard black cartridge	Black	See product page
Q5945X	Maximum-yield black cartridge	Black	See product page
Q5945A	Premium-quality black cartridge	Black	See product page
Q5945A	MICR black cartridge for check printing	Black	See product page
Compatible black cartridge	Listed under this model’s name	Black	See product page

Which cartridge should you buy?

Start with how the machine is actually used. If the M4345XSMFP is a shared workgroup hub that prints steadily all week, the maximum-yield Q5945X is the sensible default: it simply runs longer between swaps, so the cartridge door opens less often and orders go out less frequently. Lighter, intermittent use is served perfectly well by the standard Q5945A, and the premium-quality version of that same cartridge is there for buyers who prefer the higher build tier. The MICR version exists for one job only — printing checks whose magnetic characters bank readers process — and has no advantage for ordinary office pages. The model-named listing is the same cartridge sold under this printer's name; pick whichever listing you prefer, as the fitting is identical.

Chip, toner and everyday use

Each cartridge carries a chip the printer reads to confirm the cartridge type and track toner level. If a freshly fitted cartridge is not recognized, slide it out and seat it again firmly — poor contact is the usual cause. When pages begin to fade toward the end of a cartridge's life, remove it and rock it gently from side to side; the toner settles and redistributes, which often restores even coverage for a while longer. Store spares sealed, flat and away from heat and direct light, and fit a replacement as soon as fading survives the rocking test rather than coaxing a shared machine through another week.

Frequently Asked Questions

Which toner cartridge does the LaserJet M4345XSMFP use?

It uses the HP Q5945A black cartridge, sold here in standard, premium-quality and MICR versions, plus the maximum-yield Q5945X for longer runs. Match the code on the cartridge you remove before ordering.

Can the LaserJet M4345XSMFP make copies without a computer?

Yes. It works as a standalone copier: place the original on the scanner and press copy on the control panel, with no computer connection needed. Copies draw on the same cartridge as printing, so a busy copying day counts against toner just as a print run does.

When is the maximum-yield cartridge worth choosing?

When the machine prints or copies heavily every day and cartridge changes interrupt other people's work. The Q5945X holds more toner than the standard fill, so a shared M4345XSMFP goes longer between swaps; for a lightly used machine, the standard cartridge is enough.

What is the MICR version of the cartridge for?

MICR toner prints the magnetic characters along the bottom of checks so bank equipment can read them. Choose the Q5945A MICR cartridge only if this machine prints checks; for letters, reports and copies it offers nothing extra.