840.02CS310dn

Lexmark CS310dn 840.02 Error: Internal Memory Failure

The Lexmark CS310dn 840.02 error is a critical memory communication failure within the print engine. It blocks the printer from initializing correctly, often requiring a total power-cycle. Persistent occurrences without external cabling suggest an internal hardware error.

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Common causes

  • 1Temporary RAM addressing fault within the print engine.
  • 2Corruption in print data stream causing engine lockup.
  • 3Electrical surges damaging board sensitivity.
  • 4Component hardware degradation.

Solutions

Quick Diagnosis

If the printer consistently hangs on 840.02 during the boot sequence, eliminate any network or USB traffic immediately to isolate the printer from your computer's OS.

Step-by-Step Solution

  1. Full power down: Unplug the power cord for at least 60 seconds.
  2. Remove external peripherals: Disconnect USB and network cables to eliminate external interference.
  3. Cold boot: Reconnect the printer and let the system complete the POST process.

Prevention and Maintenance

Use high-quality surge protection. Prevent buffer issues by clearing old print jobs before turning off the unit for the night.

When to Call a Technician

If the error 840.02 persists while no external devices are connected, the motherboard or internal RAM chips require professional inspection or replacement.

Technical Specifications

  • Technology: Laser Color
  • CPU: 800 MHz
  • Connectivity: USB 2.0 / Ethernet
  • Throughput: 23 ppm
  • Compatible Consumable: Lexmark 702 series
  • Recommended Use: Professional Office
  • Official Drivers / Firmware

Steps to follow

  1. 1

    Full power down

    Unplug the power cord for at least 60 seconds.

  2. 2

    Remove external peripherals

    Disconnect USB and network cables to eliminate external interference.

  3. 3

    Cold boot

    Reconnect the printer and let the system complete the POST process.

Frequently asked questions

It signals a engine memory fault where the processor failed to read or write to RAM correctly.

Often a reset fixes it, but if it persists, it may indicate a board failure.

Series 702 cartridges; always use quality toner to avoid system errors.

Commonly caused by power surges or corrupted print file data causing buffer overflow.