602Pro9420WT

OKI Pro9420WT error 602: Paper Sensor Fault

The OKI Pro9420WT error 602 indicates a fault in the paper presence sensor system. The printer is unable to confirm the status of the paper feed, often caused by sensor blockage due to debris, paper dust, or physical jams. Thorough cleaning of the feed path and rollers is the most effective way to address this.

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Common causes

  • 1Paper dust buildup obscuring the optical sensor.
  • 2Debris or paper scraps lodged in the feed mechanism.
  • 3Natural degradation of feed roller grip.
  • 4Media outside the printer’s weight specifications.

Solutions

Diagnóstico rápido

Error 602 appears when sensors fail to detect paper in the feed tray or during transit. If you hear clicking sounds or the machine tries and fails to pull paper before stopping, it's a sign of a sensor or roller issue.

Solución paso a paso

  1. Open paper trays: Remove all paper from the main tray and check for any torn bits of paper or excessive dust.
  2. Clean pickup rollers: Wipe the feed rollers using a lint-free cloth dampened with isopropyl alcohol to restore friction.
  3. Sensor inspection: Gently use compressed air to clean around the paper presence sensors, clearing any trapped paper dust.

Prevención y mantenimiento

Always use paper within the supported weight range for your printer. Clean the pickup rollers every 50,000 prints. Keep paper stored in a dry, climate-controlled area to prevent paper curling, which triggers sensor errors.

Cuándo llamar a un técnico

If the error persists after thorough cleaning, the sensor actuator may have physical damage or become desynchronized, which requires professional repair.

Ficha técnica del equipo

  • Technology: LED digital.
  • Paper Capacity: 530 sheets (main tray).
  • Rollers: Maintenance kit recommended per 100k.
  • Consumibles: Original Pro9420WT toner.
  • Recommended Use: Transfer printing.
  • Drivers / official firmware

Steps to follow

  1. 1

    Open paper trays

    Remove all paper from the main tray and check for any torn bits of paper or excessive dust.

  2. 2

    Clean pickup rollers

    Wipe the feed rollers using a lint-free cloth dampened with isopropyl alcohol.

  3. 3

    Sensor inspection

    Gently use compressed air to clean around the paper presence sensors.

Frequently asked questions

Error 602 indicates a paper sensor fault where the printer cannot correctly detect whether paper is loaded or if a jam is present.

Empty the paper tray, check the entire paper path by opening the back panels, and clean the feed rollers to ensure smooth transport.

While toner doesn't, worn-out rollers or poor-quality paper with loose fibers frequently cause this error.

It happens frequently in dusty environments or when using paper types outside the specified weight range.