390C301dn
OKI C301dn error 390: Communication Failure Fix
The OKI C301dn error 390 indicates a communication breakdown between your printer and the controlling device. Users often ask why does my OKI C301dn show error 390, which is frequently caused by a faulty USB port or a saturated network interface. This efficient laser printer requires stable connectivity to maintain professional-grade printing speed.
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Common causes
- 1Damaged USB/Ethernet cable.
- 2Driver/software communication conflict.
- 3Network port switch failure.
- 4Outdated device firmware.
Solutions
Quick Diagnosis
If the printer is showing the 390 error code, it means data packets are not reaching the printer. If only one PC is affected, the problem is local to that connection.Step-by-Step Solution
- Power off the printer and unplug the connection cable.
- Reboot the PC or server sending the print job.
- Try a different USB port on your PC or replace the network cable.
- Check your printer driver settings to ensure it is not stuck in a stalled state.
Prevention and Maintenance
Use high-quality shielded data cables to minimize interference. Regularly update printer firmware from OKI's support site for better network compatibility.When to Call a Technician
If multiple workstations cannot connect and the error remains, the internal network card may require replacement.Device Technical Sheet
- Technology: HD Color Laser
- Speed: 22 ppm
- Connectivity: USB, Ethernet
- Capacity: 250 sheets
- Compatible consumables: OKI C301/C321 toner
- Recommended use: Small office
- Official Drivers / Firmware
Steps to follow
- 1
Disconnect
Turn off the printer and unplug cables.
- 2
Check
Inspect the cable for any physical damage.
- 3
Reconnect
Plug the cable into a different port.
Frequently asked questions
The printer lost connection with the host computer or network server.
Usually, it is a software or cabling issue.
OKI C301/C321 series toners.
Use high-quality shielded USB cables.