55-02DesignJet T650

HP DesignJet T650 error 55-02: Sensor failure

The HP DesignJet T650 error 55-02 is a fault in the paper support sensor detection system. This error occurs when initial calibration fails to detect the paper edge or the light sensors are blocked by accumulated dust. To resolve the error 55-02 in HP DesignJet T650, cleaning the detection area is the recommended initial step.

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Common causes

  • 1Obstruction of the sensor due to dust or particles.
  • 2Damaged paper edge preventing correct detection.
  • 3Misalignment of the plotter sensor assembly.
  • 4Electrical failure of the position sensor.

Solutions

Quick Diagnosis

Code 55-02 usually appears at the start of a paper load. If the plotter attempts to detect the edge and fails, the sensor might be physically blocked.

Step-by-step Solution

  1. Sensor cleaning: Use a dry, soft cloth to clean the optical sensors under the print carriage bar.
  2. Sensor reset: Perform a full power-off/power-on cycle to force a recalibration.
  3. Clean loading: Ensure the paper edge is straight and has no folds when entering.

Prevention and Maintenance

Perform interior cleaning with compressed air monthly to prevent dust from saturating optical sensors. Do not use liquids directly on them.

When to call a technician

If the sensors are clean and the error 55-02 persists, the sensor assembly might have an internal electrical failure.

Equipment Technical Data