420B4402

OKI B4402 error 420: Quick technical fix

The OKI B4402 error 420 signals a fault in the network interface that prevents the machine from communicating correctly with the PC or print server. This error frequently arises in corporate environments due to IP conflicts or temporary disconnections in the LAN cable. To fix the 420 error on the OKI B4402, you must check the network configuration on both the device and the environment. Proper IP management can prevent unexpected lockups.

0 views

Common causes

  • 1IP address conflict within the subnet.
  • 2Defective or loose network (RJ45) cable.
  • 3Switch port deactivated or blocked by security settings.
  • 4Desynchronization with the server's TCP/IP port.

Solutions

Diagnostic

If the printer appears as 'offline' on the computer and displays this code, the problem lies strictly within the network connection.

Step-by-Step Solution

  1. Disconnect the network cable from the printer, wait 10 seconds, and reconnect it.
  2. Verify in the control panel that the IP address is visible and within your network range.
  3. Restart the switch or router to which the printer is connected.
  4. If the machine supports manual setup, ensure the IP is static to avoid conflicts.

Prevention and Maintenance

Assign fixed IP addresses to all network printers. Verify the state of network cables semiannually.

When to call a technician

If the machine continues to show error 420 after setting a static IP, the internal network card could have a physical defect.

Technical Specifications

  • Technology: Digital LED laser
  • Speed: 45 ppm
  • Connectivity: Ethernet 10/100/1000, USB
  • Capacity: Up to 1160 sheets
  • Consumable: OKI B4402 Toner Series
  • Recommended Use: Medium workgroup
  • Official drivers / firmware

Steps to follow

  1. 1

    Reset network

    Power off printer and restart router/switch.

  2. 2

    Check IP

    Verify IP settings from the device panel.

  3. 3

    Test

    Print a network configuration page.

Frequently asked questions

This error indicates a loss of communication between the printer and the host, usually due to a network drop.

First check the IP; only reinstall if connection is unstable after restart.

It uses OKI 4402 series toner cartridges.

Assign a static IP to the printer instead of DHCP.

OKI B4402 error 420: Quick technical fix | Vimazdev