430B4402

OKI B4402 error 430: Solution guide

The OKI B4402 error 430 indicates a communication problem with the drum unit or that it has exhausted its operational life. This error stops printing tasks to prevent damage to print quality or internal mechanisms. To fix the 430 error on the OKI B4402, you must clean the density sensor and verify that the drum is seated correctly. It is a critical consumable for final print quality.

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Common causes

  • 1Drum service life exceeded.
  • 2Density sensor obstruction due to dirt.
  • 3Loose electrical connection between drum and machine.
  • 4Toner spilled onto the drum sensors.

Solutions

Diagnostic

If the error appears immediately after a toner reload, the drum may not be engaged correctly.

Step-by-Step Solution

  1. Open the top cover and remove the toner and drum assembly.
  2. Separate the toner from the drum and check for excess spilled toner on the contacts.
  3. Clean the drum sensor contacts with a dry, clean cloth.
  4. Reinsert both components firmly until you hear the safety click.

Prevention and Maintenance

Never touch the shiny surface of the drum with your fingers. Clean the drum density sensor regularly.

When to call a technician

If after replacing the drum unit with a new one the 430 error persists, the main board (Main PCB) might have a detection fault.

Technical Specifications

  • Technology: Digital LED
  • Speed: 45 ppm
  • Connectivity: USB, Ethernet
  • Capacity: 1160 sheets
  • Consumable: OKI 4402 Drum/Toner
  • Recommended Use: Medium corporate
  • Official drivers / firmware

Steps to follow

  1. 1

    Open

    Open the top cover to access the toner.

  2. 2

    Remove

    Carefully remove the drum unit assembly.

  3. 3

    Clean

    Clean the drum density sensor with a dry cloth.

Frequently asked questions

This error signals that the system cannot properly detect the drum unit or that its service life has been reached.

If cleaning the sensor doesn't resolve the issue, the drum must be replaced with a new one.

It uses OKI 4402 series toner cartridges and independent drum units.

Avoid touching the photosensitive drum surface and clean it with a lint-free cloth.