Fuser Unit
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HP Color LaserJet 3500 3700 Fuser Kit 110 Volt OEM

What is a fuser thermistor sensor? Laser printers use the combination of heat and pressure to stick toner particles into paper permanently. And as such the fuser assembly of the laser printer is a vital component devised to melt toner particle and allow it to adhere to paper fibers; resulting in a permanent bond. The fuser therefore must maintain heat temperature that range from between 180 to as much as 210 degrees Fahrenheit. The formulation of toner particles should likewise meet the required melting properties and temperature range to be an effective vehicle for laser printing. If fuser temperature could not be maintained or if the toner formulation does not meet fuser specification, then it will manifest as half-baked toner peeling off over printouts.


In the case of Lexmark laser printers, the fuser’s heating element is a Halogen Lamp designed to heat up and reach the desired temperature range. Because a Halogen Lamp can heat-up very rapidly in short stretches, it can however scourge paper (affects the hygroscopic properties) during printing if left unchecked and uncontrolled or cause the early burn-out of the Halogen lamp. The work of the Thermistor sensor therefore is to maintain the prescribed temperature ranges required for laser printing, particularly when the printer is used over long periods of time.

Did you know that you can reuse empty toner cartridges for another printing cycle? Recycle. Refill. Save! has got you covered on the basics of toner cartridge recycling.

Lexmark laser printers for commercial use comes with a fuser assembly that is designed as a modular unit which can be replaced as a complete sub-assembly. Said component has a hot upper roller made of aluminum and is coated with Teflon (coating of most frying pans). The Halogen lamp heater is built into the core and comes either in metallic gray or green. The lower pressure roller counterpart is made of silicon based rubber and usually marketed as orange colored. The Thermistor is likewise mounted on the hot fuser roller to precisely monitor the fuser temperature. Heat could damage the silicon rubber pressure rollers which eventually become soft. The Teflon coating of the hot rollers could wear-off and the Halogen lamp may burnout. A dirty Thermister coated with baked-on toner could also cause the fuser assembly to overheat.

However, aside from a well-oiled printer, the final gauge of a laser printer’s capability is still the quality of its printouts which could only be delivered by a specified toner formulation. Quality toner can only come from an OEM toner cartridge or a toner refill kit compatible to the Lexmark printer. In the case of Lexmark compatibles, LTS’ refill package come 80% cheaper. The toner refill kit for the LEXMARK C500 printer is only $25.95 against the OEM at $140. Both toner products deliver similar print quality and yield of 5,000 pages at 5% coverage.

Reuse empty toner cartridges and save as much as 80% on printing costs. Visit http://www.lasertekservices.com and shop for the toner refill kit compatible with your cartridge.

Always keep the Thermistor clean to experience quality printouts and extend the effective lifecycle of your Lexmark laser printer.

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