402OKI ES9520

Error 402 OKI ES9520: Network Communication Issues

The 402 error on the OKI ES9520 is a timeout failure in the communication between the device and the network (LAN). This occurs when the print server does not receive a response from the device in time, often due to IP conflicts or switch congestion. Restarting the network port and checking cables is the primary resolution.

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Common causes

  • 1IP address conflict within the local network.
  • 2Degraded Ethernet cable or one below Cat5e standards.
  • 3Network traffic congestion causing a communication timeout.
  • 4Switch port blocked by security policies or hardware failure.

Solutions

Diagnóstico rápido

The 402 error indicates a network problem, not a mechanical one. Check if the network icon on the panel is blinking or if the rear Ethernet port lights are off. Confirm if other devices on the same subnet can reach the printer via the 'ping' command.

Solución paso a paso

  1. Check physical connection: Unplug and reconnect the Ethernet cable, ensuring it clicks firmly into place.
  2. Restart equipment: Power off both the printer and your network switch or router for 60 seconds.
  3. Verify IP address: Access the control panel and confirm that the printer maintains a static IP, avoiding conflicts.
  4. Update port: On your PC, delete and re-add the printer using its direct IP address rather than automatic discovery.

Prevención y mantenimiento

Assign a static IP in your router's DHCP settings to prevent unexpected changes. Periodically clean the Ethernet port to prevent dust-related corrosion. Keep firmware updated to address network protocol errors.

Cuándo llamar a un técnico

If the 402 error persists after testing with a new cable and a different network port, the integrated Network Interface Card (NIC) may be faulty. Contact support for electronic repair.

Ficha técnica del equipo

  • Technology: Network printing, IP-based architecture.
  • Speed/Performance: 50 ppm.
  • Connectivity: Gigabit Ethernet, TCP/IP, IPv4/v6 protocols.
  • Feeding Capacity: Configurable trays.
  • Compatible Consumables: ES9520 Toner Series, Image Drums.
  • Recommended Use: Corporate environments with high network load.
  • Official drivers / firmware

Steps to follow

  1. 1

    Network Power Cycle

    Power off the switch and the printer for one minute to force connection renegotiation.

  2. 2

    Verify Static IP

    Set the printer with a fixed IP outside the DHCP dynamic range to prevent conflicts.

  3. 3

    Reinstall PC Port

    Create a standard TCP/IP port on your OS using the printer's direct static IP address.

Frequently asked questions

It is not hardware-critical, but it stops work. It becomes urgent if you rely on the printer for daily professional processes.

None. The 402 error is strictly network-related; toner or drums are irrelevant to LAN connectivity.

Test with a new cable on a different switch port; if the error remains, the problem lies within the printer's network card.

Use it as a last resort. First, try verifying the configuration via the control panel or the WebAdmin interface.

Error 402 OKI ES9520: Network Communication Issues | Vimazdev