520es4131dn

OKI ES4131dn Error 520: Tray Jam

The OKI ES4131dn error 520 is a frequent code indicating that the paper path sensor did not detect the sheet within the expected time after starting a print job. This usually occurs due to jams in the tray loading zone or worn feed rollers that fail to pull the sheet successfully.

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Common causes

  • 1Crystallized or dirty feed rollers.
  • 2Paper path sensor blocked by dust.
  • 3Moist paper or grammage out of range.
  • 4Tray paper guides set too tight.

Solutions

Diagnostic quick-check

If you hear the motor working but the paper doesn't enter, it's a traction issue. If the paper enters a few centimeters and stops, it's a sensor obstruction or dirty roller issue.

Step-by-step solution

  1. Pull the paper tray out completely.
  2. Look into the printer cavity; use a flashlight to spot remnants of paper.
  3. Gently remove any stuck sheet; do not use metal objects that can scratch rollers.
  4. Clean the rubber feed rollers with a slightly damp cloth.
  5. Ensure the paper in the tray is not overloaded; keep within manufacturer limits.

Prevention and maintenance

Always fan the paper before loading to separate sheets. Static accumulation often causes multiple jams, leading to error 520.

When to call a technician

Call the service desk if the 520 error occurs even with empty trays, as it indicates an internal sensor failure.

Device technical sheet

  • Technology: Monochrome LED laser printer.
  • Speed: High speed.
  • Capacity: Standard tray + manual feed.
  • Compatible consumable: ES4131 Toner (Black).
  • Recommended use: High productivity offices.
  • Official drivers / firmware

Steps to follow

  1. 1

    Extract tray

    Remove the main tray and check if the sheet is stuck at the intake.

  2. 2

    Check sensors

    Inspect paper path sensors for dust or small paper scraps.

  3. 3

    Clean rollers

    Wipe the feed rollers with a cloth dampened with distilled water.

Frequently asked questions

Error 520 indicates that a sensor has detected a paper jam or a delay in supply from the main tray.

Yes, if you pull the paper too hard, you can misalign the rollers or damage the sensor.

It uses the ES4131 toner series. Paper should be fanned before placing it in the tray.

Ensure paper guides are adjusted to the exact size of the sheets without over-tightening.