390B432dn

OKI B432dn error 390: How to fix paper jam issues

The OKI B432dn error 390 occurs when the paper registration sensor fails to detect a page entering the path. This communication issue between the paper feed mechanism and the logic board halts the print job. Understanding this error helps you restore printer functionality quickly.

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Common causes

  • 1Dust accumulation on feed rollers preventing effective paper pick-up.
  • 2Misaligned registration sensor due to tray handling.
  • 3Paper moisture causing sheets to stick together.
  • 4Mechanical wear on the feed clutch after heavy use.

Solutions

Diagnóstico rápido

Error 390 indicates a registration sensor timeout. If your machine makes a clicking sound, it's likely trying to pull paper but the sensor remains blocked or dirty.

Solución paso a paso

  1. Power cycle: Turn off the printer and unplug it for 30 seconds to reset the registration sensor.
  2. Tray check: Remove the paper tray and inspect for debris or paper fragments blocking the path.
  3. Roller cleaning: Clean the feed rollers with a lint-free dry cloth to restore grip.
  4. Test print: Power on and run a test print to confirm the error is cleared.

Prevención y mantenimiento

Clean feed rollers regularly and store paper in a cool, dry place to prevent moisture-related feeding issues.

Cuándo llamar a un técnico

If the error persists after thorough cleaning, the registration sensor assembly may be damaged and requires expert repair.

Ficha técnica del equipo

  • Technology: Digital Mono LED
  • Throughput: 40 ppm
  • Connectivity: USB 2.0, Ethernet 10/100/1000
  • Feed Capacity: 350 sheets standard
  • Compatible Consumables: B412/B432 Toner Series (45807106)
  • Recommended Usage: Medium business load
  • Official Drivers / Firmware

Steps to follow

  1. 1

    Power cycle

    Turn off the printer and unplug it for 30 seconds to reset the registration sensor.

  2. 2

    Tray check

    Remove the paper tray and inspect for debris or paper fragments blocking the path.

  3. 3

    Roller cleaning

    Clean the feed rollers with a lint-free dry cloth to restore grip.

  4. 4

    Test print

    Power on and run a test print to confirm the error is cleared.

Frequently asked questions

This message typically appears when the registration sensor fails to detect paper in the expected time, often due to dust or tray misalignment.

It is not a fatal hardware error but a operational notification that is usually resolved with basic cleaning.

No, it is related to paper path. However, ensure your B432dn drum and toner units are properly seated.

Cleaning the rollers every 5,000 pages helps prevent paper path errors like code 390.