no power, no display, light green

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  • AlejandroG
    Junior Member
    • Jun 2025
    • 4

    #1

    [Dead] no power, no display, light green

    Toshiba 4508A, with a power outage it stopped working and only the green light came on. I checked the main board and it was fine. I even tried another one that was working. I checked the fuser and it did have a burned thermostat. I tested it without the fuser and the screen came on, it loads up to 2 and the error f106 came up. I changed the thermostat and it's still the same. Does anyone know what can be done?
  • clint@clintsimonsen.com
    Trusted Tech

    Site Contributor
    100+ Posts
    • May 2013
    • 124

    #2
    You need a new secure HDD, you may be able to format it and reload firmware or recover keys. F106 has a few sub codes too. [F106_1] Secure HDD error: HDD type detection error
    [F106_2] Secure HDD error: Secure HDD encryption key download operation error
    Classification Error item
    Other service call Secure HDD error: HDD type detection fails.
    Check item Measures
    Setting If the error is not recovered after rebooting the equipment
    or no abnormality is found on any check items for the HDD,
    reinstall the system software.
    HDD • Connector check
    • Harness check
    • Perform HS-75 File system recovery mode.
    Check the file system and recover it if necessary.
    If the recovery fails, replace the HDD.
    If the equipment does not start in the HS-75 File system
    recovery mode, also replace the HDD.
    • Check that either the Secure HDD or Normal HDD is
    mounted.
    1. Perform HS-74 HDD assist mode.
    2. Check the type of the HDD shown on the control panel
    display "Current HDD type".
    Normal status: Secure HDD or Normal HDD
    Abnormal status: Unknown HDD
    If "Unknown HDD" is displayed, reinstall the system
    software.
    If the error persists even after above step, replace the HDD.
    If the equipment operation disabled after above step,
    replace the HDD.

    Comment

    • AlejandroG
      Junior Member
      • Jun 2025
      • 4

      #3

      I get the error f106-5 when I remove the fuser and when I reinstall it, the screen goes black again and only the green light is on.

      Comment

      • AlejandroG
        Junior Member
        • Jun 2025
        • 4

        #4
        According to my research, it could also be the fuser temperature sensor

        Comment

        • clint@clintsimonsen.com
          Trusted Tech

          Site Contributor
          100+ Posts
          • May 2013
          • 124

          #5
          [F106_5] Secure HDD error: Authentication data transmission error
          Classification Error item
          Other service call Secure HDD error: The transmission of authentication data
          fails.
          Check item Measures
          Setting Perform HS-73 Assist mode -> Format HDD, and then
          install the system software by performing HS-49 Firmware
          update mode -> SYSTEM SOFTWARE (HD Data).
          Notes:
          The following items will be deleted by performing HS-
          73 Assist mode -> Format HDD.
          • Message Log
          • Job Log
          • Spool Data (Print, Email reception)
          • Template
          • In case this error occurred after returning SRAM data for
          SRAM cloning:
          Copy the Secure HDD key from FROM to SRAM.
          1. Perform HS-73 Assist mode.
          2. Select “Key Backup / Restore”.
          3. Check the status of the Secure HDD key on the Key/
          Backup Restore menu.
          4. Select [ADIkey] twice.
          5. Check that copying of the Secure HDD key from the
          FROM to SRAM is selected.
          6. Press [Execute].
          7. When the restoring of the encryption key is completed,
          “Success” appears to the right-hand side of [ADIKey]
          FROM.
          8. After the operation has been completed, shut down the
          equipment.
          HDD If the error persists even after above step, replace the HDD.
          If the equipment operation disabled after above step,
          replace the HDD

          Comment

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