e985MC770dnfax

OKI MC770dnfax error E985: Toner issues

The OKI MC770dnfax error E985 occurs when the printer fails to read data from the chip integrated into the toner cartridge. This consumable communication error halts printing because the machine cannot verify the toner level or the authenticity of the installed unit. It is typically resolved by physically reinstalling the cartridge.

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Common causes

  • 1Defective or misaligned toner chip on the cartridge.
  • 2Toner dust buildup on electrical contacts.
  • 3Use of non-genuine consumables with poorly emulated chips.
  • 4Wear and tear on the printer's internal contact pins.

Solutions

Quick Diagnosis

If the E985 error points to a specific color, the problem is directly within that cartridge. If it appears without a defined color, there may be a detection failure in the printer's own chip reader board.

Step-by-step Solution

  1. Open the front cover of the MFP.
  2. Remove the toner cartridge indicated by the error.
  3. Inspect the gold chip contacts on the side of the cartridge and gently clean them with a dry cloth.
  4. Insert the cartridge again, ensuring it locks into place.
  5. Restart the printer to force a fresh consumable scan.

Prevention and Maintenance

Avoid touching the electrical chip contacts with your fingers, as skin oils can create an insulating layer that prevents communication. Store toners in a cool, dry place away from direct humidity.

When to call a technician

If the E985 error persists even after trying a known-good original toner, the internal consumable detection board is likely failing and requires service.

Technical Data

  • Technology: Color LED printer
  • Speed: 35 ppm
  • Connectivity: USB, Gigabit Ethernet
  • Compatible consumables: Genuine MC770 series
  • Recommended use: Corporate environments
  • Official drivers / firmware

Steps to follow

  1. 1

    Remove cartridge

    Remove the toner cartridge that shows the error.

  2. 2

    Clean chip

    Clean the metal contacts with a dry cloth.

  3. 3

    Reinstall

    Insert the toner firmly until it clicks.

Frequently asked questions

This error indicates that the toner cartridge chip is either not being detected or is incompatible.

Before buying, remove and reinstall the toner; if the error persists, clean the internal contacts.

Always use genuine MC770 series cartridges to avoid chip conflicts.

There is no physical reset button; it is fixed by correctly installing the consumable.