590ES9520

OKI ES9520 error 590: Toner problem

The OKI ES9520 error 590 is a standard notification about the toner's status or chip recognition. The printer halts operation to avoid damage from potential toner starvation. Replacing the consumable or cleaning the contacts will usually clear the error immediately.

1 views

Common causes

  • 1Empty toner
  • 2Defective toner chip
  • 3Incorrect cartridge seating
  • 4Contact point contamination

Solutions

Quick Diagnosis

When 590 appears, check the toner levels via the menu. If the level is fine, the chip contact may be dirty.

Step-by-Step Fix

  1. Open the printer's front panel.
  2. Remove the indicated cartridge.
  3. Swap with a genuine new one.
  4. Close the panel and wait for initialization.

Prevention and Maintenance

Handle cartridges with care during installation. Keep electrical contact pins clean from stray toner powder.

When to call a technician

If fresh cartridges consistently trigger 590, the reader board may be faulty.

Equipment specs

  • Technology: Industrial Laser
  • Performance: High production
  • Connectivity: 10/100/1000 Ethernet
  • Consumable: ES9520 series cartridges
  • Usage: Heavy duty industrial
  • Official drivers / firmware

Steps to follow

  1. 1

    Access cartridge

    Open the front cover and pull out the toner cartridge.

  2. 2

    Replace

    Insert a new original toner and ensure it clicks into position.

  3. 3

    Verify

    Close the cover and let the printer detect the new cartridge.

Frequently asked questions

The printer is unable to detect or read the toner chip.

No, it resets automatically when the lid is closed.

Use authentic OKI consumables to protect the drum.

It happens when the toner is empty or the contacts are dirty.