391-errorC311dn

Error 391 OKI C311dn: Communication Fix

The OKI C311dn error 391 signifies a communication fault preventing the device from interacting with the host system via the network. This common error is typically triggered by IP conflicts, faulty Ethernet cables, or momentary network drops. Resolving it involves simple checks on connectivity infrastructure.

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Common causes

  • 1DHCP server failure or timeout.
  • 2Damaged or inferior Ethernet cabling.
  • 3Static IP address conflict in the local subnet.
  • 4Defective internal network interface card.

Solutions

Quick Diagnosis

If your OKI C311dn displays 391, the interface is likely failing to ping the gateway. Start by checking physical links before diving into complex IP configurations.

Step-by-Step Fix

  1. Disconnect both power and Ethernet cables for two minutes.
  2. Inspect the RJ-45 port for bent or corroded pins.
  3. Replace the Ethernet cable with a verified Cat 5e/6 cord.
  4. Re-check your print queue for pending jobs that might be blocking the connection.

Maintenance and Prevention

Use high-quality cabling and keep the firmware up to date. Avoid abrupt power-offs, which can corrupt network settings. Toner quality does not typically affect this communication error.

When to Call a Technician

If the printer fails to obtain an IP after swapping cables and ports, the internal network card may require servicing.

Device Technical Specifications

  • Technology: Color LED Printing
  • Performance: 22 ppm color / 30 ppm mono
  • Connectivity: USB 2.0 & Ethernet 10/100
  • Capacity: 350-880 sheets
  • Compatible Consumable: C311/C511 series toner
  • Recommended Use: Professional workgroups
  • Official Drivers / Firmware

Steps to follow

  1. 1

    Network reset

    Power off both printer and router.

  2. 2

    Cable check

    Inspect the Ethernet cable for damage or loose connection.

  3. 3

    Verify IP

    Print the config page to check current IP address.

Frequently asked questions

This indicates that the printer is having trouble establishing a stable connection to your network.

No, error 391 is strictly related to network communication settings.

The printer uses standard C311/C511 series toner cartridges.

Ensure your network is stable and the printer is using a fixed IP address if possible.