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HP Q5421A 110-volt maintenance kit in black packaging

HP

HP Q5421A 110-volt Maintenance Kit

SKU CH-R9XC-EFEY9 MPN Q5421A

A 110-volt maintenance kit keeps compatible LaserJet 4240, 4250 and 4350 printers running with optimum print quality

  • Product categoryPrinter Accessories
  • Product categoryMaintenance Kit
  • Product colorBlack
  • Compatible withLaserJet 4240n, 4250, 4250dtn, 4250dtnsl, 4250n, 4250tn, 435
  • Product weight20
  • Key featuresEnsures optimum print quality. Ensure your HP printer stays
  • Ensures optimum print quality for consistent professional results
  • Keeps your HP LaserJet running reliably with regular maintenance
  • Designed for 110-volt LaserJet 4240, 4250 and 4350 series printers
  • Genuine HP maintenance kit backed by HP warranty
  • Kit weight 20 simplifies handling and installation

Product Identity

The HP Q5421A is a 110-volt maintenance kit designed for specific LaserJet printers. It supports models including the 4240n, 4250 and 4350 series. Businesses that rely on these devices for daily output use this kit to keep equipment running reliably. It is not for printers outside the listed compatibility range.

Thermals Noise and Power

The kit contains replacement components that maintain the printer's original thermal and power characteristics. No moving parts or active cooling are included, so noise levels remain unchanged after installation. Power draw stays consistent with the printer's factory specifications. The 20 weight figure refers to the packaged kit.

Sustained Load Behaviour

Regular installation at the recommended intervals preserves print quality during long, continuous print runs. Worn rollers or fuser parts that cause streaks or jams are replaced before they affect output. The kit helps the printer maintain consistent performance over extended duty cycles. It does not increase the engine's rated speed or monthly volume limit.

How it compares

Measured against everything we stock in Print & Scan Accessories, at today’s prices. Recalculated every night.

Price $296.99
Pricier than about 84% of the 5,855 comparable items (median $91.99).

Specifications

Product
Brand nameHP
Model nameQ5421A
Part numberQ5421A
Product categoryPrinter Accessories
Product colorBlack
Size & build
Shipping weight2.72 kg
Package size457 × 292 × 267 mm
Compatibility
Compatible withLaserJet 4240n, 4250, 4250dtn, 4250dtnsl, 4250n, 4250tn, 4350dtn, 4350dtnsl, 4350n, 4350tn

Questions about this item

How do I install the HP Q5421A maintenance kit in a LaserJet 4250, and which step is most often missed?

Power off the printer, open the right-side cover, remove the old fuser and rollers, insert the new fuser until it clicks, replace the rollers, close the cover, then run the automatic calibration from the control panel — skipping calibration is the step most users forget.

Which components in the HP Q5421A kit will need replacement again after extended use?

The fuser assembly, transfer roller, and pickup rollers included in the kit are consumable parts that wear with page volume and will require another maintenance kit when print quality declines or the printer prompts for service.

What is the first limitation that appears when the HP Q5421A kit is used continuously in a LaserJet 4350?

The fuser temperature stabilisation time becomes the limiting factor; after long print runs the printer pauses between jobs to maintain the correct 110-volt fuser temperature, slowing overall throughput.

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