e981MC770dnfax

Fix E981 Error on OKI MC770dnfax: Internal Comm Guide

The OKI MC770dnfax error E981 is an internal communication alert focused specifically on the link between the user interface panel and the primary controller. When this connection fails, the system locks to prevent command errors. If your MC770dnfax displays error E981, the unit remains in a standby state until the data link is restored.

1 views

Common causes

  • 1Loose internal ribbon cable connection.
  • 2Failure of communication chip on the panel board.
  • 3Data saturation during complex task processing.
  • 4Oxidation of contact pins on the connector.

Solutions

Diagnóstico rápido

The E981 is sudden. If the screen flickered or displayed garbage characters before the code appeared, it is almost certainly a physical communication failure due to a loose cable.

Solución paso a paso

  1. Power off the printer completely.
  2. Disconnect the power cord for at least a minute.
  3. Inspect the ribbon cable behind the touchscreen panel to ensure it is fully seated.
  4. Reconnect power and switch the unit back on.
  5. Perform a test print if the error clears.

Prevención y mantenimiento

Avoid moving the printer while it is powered on; vibrations can cause ribbon cables to slip out of their connectors. Keep the panel area clean to prevent moisture or dust from affecting the ribbon contact points.

Cuándo llamar a un técnico

If the E981 error persists after verifying all connections, the control panel's internal board is likely faulty and requires replacement.

Ficha técnica del equipo

  • Technology: Digital LED Color.
  • Speed: 35 ppm.
  • Connectivity: USB, Gigabit Ethernet.
  • Input capacity: 630 sheets base.
  • Compatible consumables: Original MC770 series toner.
  • Recommended use: Medium-sized workgroups.
  • Drivers / official firmware

Steps to follow

  1. 1

    Power cycle

    Power off the unit using the main switch and disconnect power.

  2. 2

    Cable check

    Ensure the ribbon cable connecting the control panel is seated firmly.

  3. 3

    Reset

    Turn the printer on and verify if the E981 error clears.

Frequently asked questions

This signals a communication failure between the touchscreen control panel and the printer's mainboard.

If it is a loose cable, yes. If the panel board itself is damaged, professional support is needed.

Use genuine MC770 series toner to keep the system's electronic environment clean and stable.

Keep the printer in an area free from excessive vibration to prevent connector loosening.

Fix E981 Error on OKI MC770dnfax: Internal Comm Guide | Vimazdev