390 ErrorB432dnHas video

How to Fix OKI B432dn 390 Error Code

The 390 Error code on the OKI B432dn indicates that the main board cannot properly read or write to the image drum's EEPROM chip.

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Common causes

  • 1Dirty or oxidized electrical contacts on the image drum cartridge.
  • 2Toner dust blocking the internal connection pins inside the printer chassis.
  • 3Defective or incompatible image drum smart chip.

Solutions

Resolving the 390 Image Drum Error

This is typically caused by connection issues, toner powder blockages, or a faulty chip. Try these steps:

  1. Clean the Drum Electrical Contacts:
    * Turn off the printer and open the top cover.
    * Carefully lift out the image drum assembly (which holds the toner cartridge).
    * Locate the copper/metal contact pins on the side of the drum and inside the printer frame cavities.
    * Use a dry, lint-free cloth or a cotton swab slightly dampened with isopropyl alcohol to clean any toner dust build-up from these contacts. Let dry completely.
  1. Reseat the Drum Assembly:
    * Re-insert the drum assembly firmly back into its position.
    * Verify that the blue toner lock lever is pushed all the way to its locked position.
    * Close the top cover and power the unit back on.

Steps to follow

  1. 1

    Remove the Drum Cartridge

    Turn off the printer, open the top cover, and pull out the complete image drum unit.

  2. 2

    Clean the Contacts

    Clean the lateral contact plates on the drum assembly and the spring-loaded pins inside the printer using isopropyl alcohol.

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Frequently asked questions

Yes, if the third-party drum uses an incompatible or poorly positioned chip, the printer's mainboard will trigger the 390 error.

In most cases, yes. However, if the EEPROM chip has suffered an electrostatic discharge (ESD) or is physically broken, the drum cartridge must be replaced.

How to Fix OKI B432dn 390 Error Code | Vimazdev