390b4601

OKI B4601 Error 390: Causes and Quick Solutions

The OKI B4601 error 390 is a critical alert related to the imaging system. It occurs when the drum unit mechanism does not rotate correctly or its internal sensor is blocked. To fix the error 390 on OKI B4601, cleaning the drum contacts is usually sufficient, although it sometimes requires replacing the imaging unit. This laser office printer relies on proper consumable detection to maintain its high output quality.

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Common causes

  • 1Physical wear of the drum gear mechanism.
  • 2Toner dust accumulation on the optical sensor.
  • 3Oxidized or dirty metal contact points.
  • 4Electronic failure in chip recognition.

Solutions

Quick Diagnosis

The error 390 manifests with a blinking status light and a complete panel lockout. To confirm if the issue is the drum, verify if the error persists immediately after opening and closing the front cover, which often points to a sensor reading failure.

Step-by-step Solution

  1. Power off the printer completely using the rear switch.
  2. Open the front cover and pull out the toner and drum assembly.
  3. Visually inspect for paper scraps or toner dust near the drum sensor area.
  4. Gently clean the golden electrical contacts with isopropyl alcohol and a soft cloth.
  5. Reinstall the assembly and restart the printer.

Prevention and Maintenance

Avoid using low-quality toners that release excess dust, as it tends to settle on the optical sensors. Perform monthly cleaning with compressed air in the input tray.

When to Call a Technician

If the message persists after cleaning the contacts, the main optical sensor may be damaged or the motherboard might require a firmware update, which requires a professional technician.

Equipment Data Sheet

  • Technology: Monochrome Laser
  • Speed/Performance: Up to 40 ppm
  • Connectivity: USB 2.0, Ethernet
  • Feed Capacity: 250 sheets standard
  • Compatible Consumable: B4600 series toner / B4601 drum unit
  • Recommended Use: Corporate office environments
  • Official drivers / firmware

Steps to follow

  1. 1

    Power off the device

    Disconnect the printer from power for at least 30 seconds.

  2. 2

    Check imaging unit

    Open the top cover and remove the drum assembly to check for debris.

  3. 3

    Clean contacts

    Wipe the metal contacts of the drum with a dry, lint-free cloth.

Frequently asked questions

This code indicates the internal sensor fails to detect the drum unit due to dust or the end of its service life.

It is a blocking error that prevents printing, so it requires immediate attention to avoid potential motor strain.

This model requires genuine drum units to ensure proper sensor communication.

Perform internal cleanings every time you replace the toner to prevent particle buildup.