550B401d

OKI B401d error 550: Memory failure fix

OKI B401d error 550 signifies a memory overflow, typically triggered when a document is too complex for the printer's buffer memory. This is common when processing image-heavy documents. Clearing the queue and restarting is the primary remedy.

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Common causes

  • 1Excessive image density in PDFs.
  • 2Too many queued jobs clogging the buffer.
  • 3Malformed print files causing processing timeouts.
  • 4Insufficient device RAM for the data load.

Solutions

Diagnóstico rápido

The error 550 happens mid-process when sending files. If the display locks up, verify that you aren't sending a high-resolution PDF that overwhelms the 64MB RAM limit.

Solución paso a paso

  1. Stop: Clear the active print queue in your OS.
  2. Reset: Power cycle the printer to dump the internal memory cache.
  3. Split: Break your massive file into smaller 10-20 page chunks.
  4. Test: Print a small, simple document to verify functionality.

Prevención y mantenimiento

Reduce the output resolution (DPI) of your graphics-rich documents before hitting print to stay within memory constraints.

Cuándo llamar a un técnico

If the printer fails to print even the simplest text documents, there might be a board error or a firmware issue requiring professional support.

Ficha técnica del equipo

  • Technology: Monochrome laser
  • Standard RAM: 64 MB
  • Connectivity: USB 2.0
  • Input capacity: 250 sheets
  • Consumables: B401 toner cartridge
  • Recommended usage: Administration documents
  • Drivers / firmware official

Steps to follow

  1. 1

    Clear queue

    Cancel all pending documents in your computer's print spooler.

  2. 2

    Hardware reset

    Power off the printer and unplug it for one minute to flush RAM.

  3. 3

    File splitting

    Break large, high-res PDF files into smaller batches.

Frequently asked questions

Error 550 means the printer lacks the RAM required to process the data sent from the computer.

Avoid sending huge high-resolution PDF files; print them in smaller segments.

No, this is a memory processing error related to data, not a toner hardware issue.

Yes, firmware updates often improve how memory is managed during complex tasks.