Buffer Full ErrorEpson TM-T20III

Epson TM-T20III Buffer Full Error - Fix Guide

The Epson TM-T20III is a robust, high-speed thermal receipt printer designed for busy POS environments. It relies on an internal memory buffer to store incoming print tasks. The 'Buffer Full Error' arises when the printer receives data faster than it can process it, or when communication hangs, clogging the memory. Addressing this is crucial for maintaining efficient transaction flow and preventing print job buildup.

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Common causes

  • 1Massive data packets exceeding the printer's processing limit.
  • 2Mismatched baud rate or transmission speed settings.
  • 3Communication interruption mid-transmission.
  • 4Outdated driver versions causing poor print queue management.

Solutions

Diagnóstico rápido

The error shows up when the printer stops responding and the POS software indicates a locked print queue. This is common if the host is sending data faster than the current interface speed or driver settings allow.

Solución paso a paso

  1. Cancel all pending jobs in the print queue on the host computer.
  2. Unplug the printer for 60 seconds to clear the internal volatile memory (buffer).
  3. Verify port settings in the Device Manager to ensure baud rate matches the host configuration (for serial connections).
  4. Restart the Print Spooler service on your Windows host machine.
  5. Perform a test print to verify smooth data transfer and responsiveness.

Prevención y mantenimiento

  • Ensure the latest Epson Advanced Printer Drivers are installed.
  • Avoid sending complex, high-resolution graphics if the software cannot manage the throughput.
  • Use high-quality, stable interface cables to prevent data transmission errors that cause buffer saturation.

Cuándo llamar a un técnico

If the error persists after clearing the queue and updating drivers, there may be a failure in the printer's internal RAM or logic board. This requires professional repair or component replacement.

Ficha técnica del equipo

  • Technology: Direct thermal printing.
  • Speed: 250 mm/s.
  • Memory Management: Integrated data buffer (4KB/45 bytes).
  • Consumable compatible: 80mm thermal paper rolls.
  • Recommended use: High-volume POS transaction environments.

Steps to follow

  1. 1

    Clear queue

    Cancel all jobs pending in the system print queue.

  2. 2

    Power reset

    Disconnect the power for one minute to clear memory.

  3. 3

    Port check

    Review the port settings against the driver specifications.

  4. 4

    Test print

    Print a test receipt to ensure normal functionality.

Frequently asked questions

It is usually due to overwhelming the printer with too much data or having a communication mismatch between the PC and the printer.

No, this is a memory and communication error. This printer does not use ink, toner, or ribbons.

Keep your printer drivers updated and ensure your interface cables are properly connected.

Yes, because it stops the printer from issuing receipts, which directly affects your ability to process customer payments.