950T642n

Lexmark T642n Error 950: NVRAM Failure Troubleshooting

Lexmark T642n error 950 typically appears when the internal NVRAM module fails to initialize during the boot sequence. This error often points toward logic board issues or corrupted firmware configuration. Following these steps can help identify if a simple reset resolves the problem or if component replacement is needed.

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Common causes

  • 1Power surge damaging the NVRAM memory chips.
  • 2Corrupted firmware files due to interrupted updates.
  • 3Internal hardware failure on the main system board.
  • 4Connectivity issues within the control panel ribbon cables.

Solutions

Quick Diagnosis

The error 950 is recognized by the printer freezing during the startup initialization process. If the display is non-responsive to user input, the logic controller is unable to access critical configuration data.

Step-by-Step Solution

  1. Disconnect all interface cables (Ethernet/USB) to isolate the printer.
  2. Power on the device while holding 'Select' and 'Return' to reach the Configuration Menu.
  3. Navigate to the 'Resets' menu section.
  4. Execute 'Restore Factory Defaults' or 'Reset NVRAM'.
  5. Restart the printer normally.

Maintenance and Prevention

Ensure the printer is plugged into a high-quality surge protector. Avoid turning the unit off during firmware updates. Perform annual vacuuming of the interior to keep electronics cool and dust-free.

When to Call a Technician

If the error 950 appears immediately after a hard reset, the logic board is physically compromised and requires professional service.

Printer Technical Specs

  • Technology: Laser Monochromator
  • Performance: 45 ppm
  • Connectivity: Ethernet, USB 2.0
  • Paper Capacity: 600 sheets
  • Consumable: Lexmark T64x series (64016HE)
  • Recommended Use: High-volume offices
  • Official Firmware/Drivers

Steps to follow

  1. 1

    Power Cycle

    Turn off the printer and unplug it for one minute to drain residual electricity.

  2. 2

    Access Config Menu

    Hold down the Select and Return buttons while powering on the printer to access the diagnostic menu.

  3. 3

    Perform NVRAM Reset

    Select the NVRAM reset option and confirm to factory reset the printer's internal memory.

Frequently asked questions

This code means the controller cannot access the non-volatile memory, often due to a corrupted memory chip or power surge.

If a factory reset does not resolve it, the system board is likely physically damaged and requires replacement.

The T642n uses the Lexmark T64x series toner cartridges, such as the 64016HE.

Regular annual dusting of internal components is recommended to prevent electronic failure from debris and dust buildup.