600B721dn

OKI B721dn error 600: Paper feed troubleshooting

The OKI B721dn error 600 is an alert signaling a paper feed failure or tray detection issue. This often happens if paper is misaligned or if the feed rollers have accumulated dust, causing the paper to slip. Follow these steps to clear the obstruction and restore printing operations.

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Common causes

  • 1Torn paper fragments in the sensor path.
  • 2Slick or worn feed rollers preventing paper pickup.
  • 3Overloaded paper tray forcing misfeed.
  • 4Humidity warping the paper stock.

Solutions

Diagnóstico rápido

Error 600 occurs when the sensor fails to detect paper in the tray or when the mechanism cannot move the paper into the print path. Check for any small paper tears inside the printer body.

Solución paso a paso

  1. Check tray: Adjust the paper guides to hold the stack firmly.
  2. Clean rollers: Use a slightly damp cloth to clean the feed rollers.
  3. Inspect sensors: Remove any debris found in the paper path.
  4. Reload and test: Try printing again with high-quality paper.

Prevención y mantenimiento

Store paper in a dry environment. Replace rollers every 100,000 pages to maintain consistent feed performance.

Cuándo llamar a un técnico

If the rollers are clean and no obstructions exist, the paper feed motor or sensor unit may require professional attention.

Ficha técnica del equipo

  • Technology: Monochrome LED Printer
  • Speed/performance: 47 ppm
  • Connectivity: USB/Ethernet
  • Paper capacity: 630 sheets
  • Consumables: B700 Series Toner
  • Recommended use: Corporate environments
  • Official drivers / firmware

Steps to follow

  1. 1

    Check tray

    Pull out the main paper tray and ensure paper is loaded correctly against the guides.

  2. 2

    Clean rollers

    Wipe the feed rollers with a damp, lint-free cloth to restore grip.

  3. 3

    Inspect sensors

    Check for any torn paper scraps obstructing the feed path sensors.

  4. 4

    Reload and test

    Reload fresh paper and try the print command again.

Frequently asked questions

Error 600 indicates the printer cannot detect paper or the feed path is blocked by debris.

Yes, printing will be suspended until the sensor path is cleared.

Yes, improper or humid paper is the primary cause of feed blockages.

Always fan the paper stack before loading and periodically clean the rubber feed rollers.