900.00MS321dn

Lexmark MS321dn error 900.00: Technical Fix

The Lexmark MS321dn error 900.00 is a general firmware exception that signals a failure in print command processing. This error typically arises when the printer receives a file with corrupt or incompatible data, causing a main system crash. Performing a power reset is essential to clear cache and restore function.

1 views

Common causes

  • 1Corrupt print queue data blocking the processor.
  • 2Obsolete firmware version with known bugs.
  • 3Network communication failure (IP conflicts).
  • 4Damaged hardware on the memory controller card.

Solutions

Quick Diagnosis

Error 900.00 often appears when printing large PDFs or documents with complex fonts. If the message persists after rebooting, the firmware may be outdated.

Step-by-Step Solution

  1. Power off the printer and disconnect the network/USB cable.
  2. Wait 60 seconds to allow volatile memory to clear.
  3. Power on without network connectivity to verify normal startup.
  4. Update firmware by downloading the latest version from the Lexmark support portal.

Prevention and Maintenance

Update firmware regularly to address known vulnerabilities. Clean feed rollers every six months. Use original toner to ensure chip communication stability.

When to Call a Technician

If the error persists after firmware updates and an NVRAM reset, there may be a physical failure on the controller card.

Device Specifications

  • Technology: Monochrome Laser
  • Speed: Up to 36 ppm
  • Connectivity: USB 2.0, Ethernet, Wi-Fi
  • Capacity: 250-sheet standard tray
  • Consumable: 50F cartridge series
  • Usage: Small office environments
  • Official Drivers / Firmware

Steps to follow

  1. 1

    Power cycle

    Power off and unplug for 60 seconds.

  2. 2

    Network check

    Disconnect network cables to clear print queues.

  3. 3

    Update firmware

    Download and install official firmware from Lexmark support.

Frequently asked questions

This is a generic software error indicating a firmware exception.

Restart the device and update firmware to the latest version.

It uses the Lexmark 50F or 501 series cartridges.

Usually occurs when processing complex print jobs.