ALARM-LED-ONMicroline 320 TurboHas video

How to Fix OKI Microline 320 Turbo ALARM LED Solid On

A solid ALARM LED on the OKI Microline 320 Turbo signals a paper out condition or feed path error. It usually occurs when the optical/mechanical sensor fails to detect loaded media or the paper selector lever is misplaced.

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Common causes

  • 1Printer is physically out of continuous forms or single sheets.
  • 2The paper selection lever is set to the wrong mechanical input.
  • 3Paper debris or ribbon dust is preventing the sensor arm from triggering.

Solutions

Diagnostics and Paper Sensor Maintenance

The OKI ML 320 Turbo uses a mechanical micro-lever sensor near the platen to detect paper presence. Carbon ribbon dust and paper debris frequently clog this lever, causing fake 'Paper Out' states.

  1. Check Selector Lever Position: Ensure the green paper selection lever (right side of the printer) is pushed fully back for continuous forms or pulled fully forward for single sheets.
  2. Clean the Paper End Sensor: Disconnect the power cord. Blow compressed air into the tractor path and behind the platen. Locate the small plastic actuator tab and verify it moves freely up and down.
  3. Perform a Force Load: Reload your forms and press the FF/LOAD button to cycle the paper path and clear the error flag.

Steps to follow

  1. 1

    Power Down and Disconnect

    Turn off the printer power switch and unplug the AC power cord to ensure electrical safety.

  2. 2

    Clear the Paper Path

    Remove any paper or form sheets. Visually inspect the tractor gears and platen roller for scraps of torn paper.

  3. 3

    Clean the Actuator Sensor

    Gently blow compressed air around the micro-switch sensor lever to remove dust buildup.

  4. 4

    Align the Selector Lever

    Set the green lever on the right side to match your media type (rear tractor vs. top sheet feed).

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Frequently asked questions

This happens when the paper selection lever does not match the actual physical feed mechanism being used, or when the mechanical sensor lever is jammed with dust.

With power disconnected, gently press the small black plastic lever in the paper path. It should spring back up cleanly. If it stays depressed, the sensor assembly needs replacement.

How to Fix OKI Microline 320 Turbo ALARM LED Solid On | Vimazdev