400OKI ES9541 MFP

Fixing Paper Path Error 400 on OKI ES9541 MFP

Error 400 on the OKI ES9541 MFP is a common notification regarding the paper feed mechanism. It occurs when the printer sensors detect irregular paper intake or a potential obstruction. Routine maintenance of the feed rollers is the best way to prevent this from recurring.

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Common causes

  • 1Toner dust buildup reducing roller traction.
  • 2Paper weight exceeding the supported limits for the tray.
  • 3Debris blocking the optical paper path sensor.

Solutions

Cleaning Feed Rollers

  1. Remove the paper tray.
  2. Clean the rubber rollers using an approved printer roller cleaner.
  3. Allow the rollers to dry completely before reinserting the tray.

Sensor Inspection

  1. Carefully remove any paper debris from the input sensors.
  2. Ensure the sensor flag is not stuck in the 'closed' position.

Steps to follow

  1. 1

    Remove Tray

    Pull the paper tray out to access the interior feed area.

  2. 2

    Clear Obstructions

    Check for any small scraps of paper stuck near the pickup rollers.

  3. 3

    Realign Paper

    Adjust the paper guides to snugly fit the stack without compressing it.

Frequently asked questions

Periodic maintenance every 50,000 pages helps avoid this error.

The printer will continue to halt until the paper path is cleared.

Use water or alcohol-free rubber roller cleaner to prevent drying out the rubber.