134C711dnHas video

How to Resolve OKI C711dn Error 134 (LED Head Fault)

Error code 134 on the OKI C711dn occurs when the main control board experiences a data transmission failure or bad response from the Cyan LED printhead. It is typically resolved by wiping the lens array or reseating the flat ribbon cable.

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Common causes

  • 1Toner dust or paper debris shielding the LED lights from reaching the drum.
  • 2A loose, slanted, or crimped flat flexible ribbon cable.
  • 3Sudden electrical interference causing logic controller desynchronisation.
  • 4Permanent physical burnout of the LED light elements or internal controller board.

Solutions

Guide to Troubleshooting the LED Printhead (Error 134)

Unlike traditional laser printers that rely on scanning mirrors, the OKI C711dn uses static solid-state LED arrays to project the electrophotographic image onto the drums. Error 134 triggers when the controller detects inconsistent data packets from the LED head.

Optical Cleaning and Connection Steps:

  1. Unplug Electricity: Power off and disconnect the printer before checking any electronic parts.
  2. Clean LED Arrays:
    - Open the top printer hatch.
    - Look at the narrow metal rods under the inner top cover (these are the LED heads).
    - Gently wipe the glassy lenses of all four heads using the orange felt cleaner tool provided with the OKI printer or a dry microfiber cloth.
  3. Reseat Flat Flexible Cable (FFC):
    - Check the wide white ribbon cable connecting the problematic LED array unit.
    - Carefully unlock the connector latch, slide out the ribbon cable, gently clean the copper pins with an eraser to remove oxides, and reinsert it tightly.

Steps to follow

  1. 1

    Power Off

    Turn off the main switch and disconnect the AC cord of the printer.

  2. 2

    Clean Lens Glass

    Open the lid and wipe down the bottom glass strip of the LED bar using a clean lint-free cloth.

  3. 3

    Verify Ribbon Cable Connection

    Locate the flat ribbon harness going to the Cyan LED head. Check for correct alignment and seat depth.

  4. 4

    Test Cycle

    Close the top lid securely, plug in the power cord, boot up the printer, and run a test page.

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Frequently asked questions

No. In most cases, it is a basic wiring connection glitch or severe dust blocking. Reseating the flat ribbon cable is highly effective in clearing this code.

While physical dimensions are similar, swapping cables and heads without factory service manual training may confuse the internal color calibration matrix. Clean the cables and heads instead of swapping them.