400C931dn

OKI C931dn error 400: Network communication failure

The OKI C931dn error 400 is a network request error indicating that the printer cannot complete a transmission task. This happens when there is a mismatch in communication settings or physical connection faults. Troubleshooting focuses on network isolation and ensuring valid IP assignment within the enterprise environment.

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Common causes

  • 1IP address conflict on the local network.
  • 2Bad or damaged Ethernet cabling.
  • 3Switch/Router port malfunction.
  • 4Firewall software blocking printer communication.

Solutions

Diagnóstico rápido

The 400 error points to a failure in network request processing. Check if you can ping the printer from a terminal on your PC to see if it is still alive on the network.

Solución paso a paso

  1. Cabling: Replace the Ethernet cable with a known-good one.
  2. Network Settings: Perform a 'Network Reset' from the system panel to clear old configurations.
  3. Static IP: Assign a static address manually to bypass DHCP conflicts.
  4. Driver Check: Reinstall the print driver on the workstation using the new IP address.

Prevención y mantenimiento

Assigning static IPs to office printers prevents conflicts during DHCP refreshes. Always use high-quality Cat6 cables to minimize data collisions and noise in high-traffic office environments.

Cuándo llamar a un técnico

If the printer shows no activity on the network port (no LEDs) and has failed multiple cable and port tests, the internal NIC might need to be replaced.

Ficha técnica del equipo

  • Technology: LED Digital color.
  • Speed: 50 ppm.
  • Connectivity: 10/100/1000 Mbps Ethernet.
  • Capacity: 530 sheets.
  • Consumable type: OKI C900 Series.
  • Usage: Corporate networks.
  • Official drivers/firmware

Steps to follow

  1. 1

    Physical check

    Ensure the Ethernet cable is securely connected and the port LEDs are blinking appropriately.

  2. 2

    IP check

    Access the network menu to verify if a valid IP address is assigned to the machine.

  3. 3

    Network reset

    Power cycle the router or switch to clear any lingering network conflicts.

Frequently asked questions

The error 400 indicates a network request error, often due to an IP conflict or bad cabling within your LAN.

No, error 400 is strictly a network connectivity issue and is unrelated to print consumables or image drums.

You can assign a static IP through the printer's front panel network menu to ensure stable corporate network communication.

Update your printer's firmware at least twice a year to ensure stable network protocol support.

OKI C931dn error 400: Network communication failure | Vimazdev