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Four black toner refill bottles in a box

Laser Tek Services

Laser Tek Services 03A Black Toner Refill Kit for HP C3903A 4PK

SKU CH-5K91-GP78M

Black toner refill kit for HP LaserJet 5P, 5MP, 6P, 6MP and 6Pse printers, four packs

  • Refill kit extends cartridge life for HP LaserJet printers
  • Four-pack supplies enough toner for multiple refills
  • Compatible with LaserJet 5P, 5MP, 6P, 6MP, 6Pse models
  • Includes instructions for straightforward refill process
  • Black toner produces consistent output for everyday documents

Compatible Black Toner Refill Kit

This Laser Tek Services refill kit is designed for users who want to extend the life of compatible HP C3903A cartridges. It suits home, office, and business environments where consistent document printing is required. The four-pack bundle provides enough material for multiple refill cycles. Buyers needing brand-new OEM cartridges or colour toner should look elsewhere.

Thermals Noise and Power Draw

As a consumable refill kit, this product does not generate heat, produce noise, or draw electrical power during printer operation. The thermal and acoustic profile remains entirely dependent on the LaserJet printer hardware in use. No additional power supply or cooling considerations are introduced by the refill materials.

Included Refill Materials and Instructions

The kit supplies toner powder and step-by-step instructions for a straightforward refill process. These components enable users to replenish compatible cartridges without specialised tools. The bundled guidance helps maintain print quality and reduces the frequency of full cartridge replacements. No software, chips, or hardware accessories are included.

How it compares

Measured against everything we stock in Compatible Laser Toner, at today’s prices. Recalculated every night.

Price $27.99
Cheaper than about 76% of the 15,190 comparable items (median $47.99).

Specifications

Product
Brand nameLaser Tek Services

Questions about this item

How do I refill the HP C3903A cartridge using this kit and what step is most often missed?

Open the cartridge, pour the black toner from one bottle into the hopper, then reseal the fill hole before reinstalling; the step most often missed is cleaning the waste-toner compartment so old residue does not mix with the fresh fill.

Which parts will need replacement after several refill cycles?

The organic photoconductor drum, the primary charge roller and the waste-toner recovery blade wear out first; they are not included in this four-pack refill kit and must be sourced separately when print defects appear.

What print-quality limit appears first during long, continuous print runs?

Toner starvation on solid-black pages shows up first because the refill hopper feeds by gravity and cannot keep pace with the engine demand during sustained high-coverage output.

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