Toshiba 6LJ81641000 Fuser Thermistor THMS-HTR-H390 e-STUDIO

Fuser Temperature Sensor for e-STUDIO Copiers

The Toshiba fuser thermistor is the temperature-sensing element that presses against the fuser roller on a range of Toshiba e-STUDIO mono copiers. It reports roller temperature back to the machine control board. The part carries Toshiba number 6LJ81641000 and the description code THMS-HTR-H390.

The sensing element is an NTC thermistor, so resistance falls as the roller heats and the control board converts that reading into a temperature value. The board uses the value to switch the heater lamp and hold the fusing window. An open circuit or a drifting sensor triggers a fuser error and stops the machine from printing.

The sensor mounts on the fuser frame and connects through the fuser harness. Fitment covers the e-STUDIO 2303AM, 2309AM, 2323AM, 2523A, 2523AD, 2802AM, 2803, 2809A, 2822, 2823AM and 2829A. Replacement is a fuser-area service job, and the machine must be powered down and allowed to cool first.

Typical failure signs include a fuser error at power-up, a machine that stops mid-job, or copies that come out with toner smeared because the roller runs cold. Inspect the sensor face for baked-on toner and the lead for chafing before ordering, since a contaminated sensor can mimic an electrical fault.

Key Features

• Genuine Toshiba Part Number
  The unit matches the 6LJ81641000 listing and the THMS-HTR-H390 description used in Toshiba parts catalogues.

• NTC Sensing Element
  Resistance falls with rising roller temperature, giving the control board a continuous feedback signal.

• Model Coverage

  • e-STUDIO 2303AM and 2309AM
  • e-STUDIO 2323AM, 2523A and 2523AD
  • e-STUDIO 2802AM, 2803 and 2809A
  • e-STUDIO 2822, 2823AM and 2829A

• Fuser Harness Connection
  The lead terminates in the connector that mates with the fuser harness, so no splicing is needed.

• Error Code Resolution
  Replacing a failed sensor clears fuser temperature faults caused by an open or unstable reading.

• Straightforward Fitment
  The body seats against the existing mounting point on the fuser frame without adapters.

Specifications

What’s in the Box

• One fuser thermistor

Why Choose This Sensor

• A stable temperature reading keeps the heater lamp cycling evenly across a long print run.

• The correct NTC curve matters, because a substitute sensor can shift the fusing window and cause smearing.

• One part number covers eleven e-STUDIO models, which trims the spares list on a mixed fleet.

• The plug-in lead keeps the repair inside a routine fuser service visit.

• Inspecting the sensor face before fitting avoids a repeat call-out on a machine with a contaminated fuser.

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