E03Fujitsu DL3750+Has video

Fix Fujitsu DL3750+ E03 Error | Paper Gap Reset

The E03 error code on the Fujitsu DL3750+ matrix printer indicates an incorrect distance setting between the 24-pin print head and the platen roller. Using multi-part carbonless forms without opening the paper gap lever triggers this sensor fault.

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Common causes

  • 1Paper gap lever set too tight for thick or multi-part continuous media.
  • 2Media thickness exceeds maximum specification limits.
  • 3Paper dust obstructing the gap sensor notch.
  • 4Mechanically stiff or unseated head gap mechanism.

Solutions

Troubleshooting Paper Gap Error E03

This setting controls pin impact clearance and prevents print head ribbon tears.

Step-by-Step Resolution:

  1. Locate Gap Lever: Find the paper gap adjustment lever located near the print head assembly inside the main cover.
  2. Set Thickness Number: Position the lever to '1' or '2' for standard single-part paper. Shift to '3' or higher for multi-part forms (up to 5 copies).
  3. Reset State: Turn off the power switch, wait 5 seconds, and switch it back on to clear the sensor alarm.

Steps to follow

  1. 1

    Check media thickness

    Determine if you are printing on single sheet paper or multi-part continuous forms.

  2. 2

    Adjust paper gap lever

    Slide the graduated lever to match the copy count of your continuous media.

  3. 3

    Power reset the printer

    Turn off the power switch, wait 5 seconds, and turn back on to test.

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Frequently asked questions

Set the paper gap lever to position 3 for reliable feeding without triggering code E03.

The print out will appear faint or light because the impact pins will not strike close enough to the paper.