400mc573dn

OKI MC573dn error 400: Paper jam troubleshooting

The OKI MC573dn error 400 is the standard notification for a paper jam. When the printer stops mid-job and displays this code, it means the paper path is obstructed. This can be caused by misaligned paper, dust in the rollers, or exceeding the weight capacity of the machine.

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Common causes

  • 1Use of paper exceeding 220 g/m² limit.
  • 2Accumulated paper dust reducing roller friction.
  • 3Misaligned side guides on the paper tray.
  • 4Mechanical wear on feeding rollers.

Solutions

Diagnóstico rápido

You can usually pinpoint the jam by looking at the control panel indicators or listening for irregular mechanical sounds. If the machine seems clear but the error remains, there may be a tiny piece of paper stuck near the fusor or an exit sensor blocked by dust.

Solución paso a paso

  1. Power off device: Turn off the printer and unplug it before attempting any internal maintenance.
  2. Remove paper tray: Pull out the main paper tray and check for misaligned or wrinkled sheets.
  3. Clear path: Open the rear cover and gently pull out any jammed paper in the direction of the paper feed.

Prevención y mantenimiento

Fan the paper before loading it to prevent sheets from sticking together. Keep the printer away from high-humidity areas to prevent paper curling, which is a common cause of jams. Regular roller maintenance ensures consistent feeding.

Cuándo llamar a un técnico

If you have cleared all paper bits and the error 400 continues, the paper feed clutch or a sensor may be mechanically failing.

Ficha técnica del equipo

  • Technology: Digital Color LED
  • Print speed: 30 ppm
  • Connectivity: USB 2.0, Ethernet
  • Feed capacity: 630 sheets total
  • Supplies: OKI MC573 original toner series
  • Best for: Office productivity
  • Drivers / official firmware

Steps to follow

  1. 1

    Power off device

    Turn off the printer and unplug it before attempting any internal maintenance.

  2. 2

    Remove paper tray

    Pull out the main paper tray and check for misaligned or wrinkled sheets.

  3. 3

    Clear path

    Open the rear cover and gently pull out any jammed paper in the direction of the paper feed.

Frequently asked questions

The error 400 indicates a paper jam. Internal sensors have detected that a sheet of paper is not moving through the print path correctly.

No, pulling paper roughly can damage delicate internal sensors and rollers. Always pull gently and follow the path of movement.

Use high-quality office paper within the recommended weight range. Avoid using heavy cardstock if not supported by your model's settings.

Periodically clean the rubber rollers using a lint-free cloth dampened with distilled water to remove paper dust and restore grip.