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Lexmark CX725

Lexmark CX725

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Controller board removal

Critical information for controller board or control panel replacement

Warning—Potential Damage:  Replace only one of the following components at a time:

  • Control panel
  • Controller board

    To replace a component and to test whether the problem is resolved:

  1. Replace the affected component.

    Warning—Potential Damage:  Do not perform a Power-On Reset (POR) until the problem is resolved. If a POR is performed at this point, then the replacement part can no longer be used in another printer and must be returned to the manufacturer.

  2. Enter the Diagnostics Menu. The Diagnostics Menu allows you to temporarily use the replacement part.

    Warning—Potential Damage:   Some printers will perform a POR automatically if the Diagnostics Menu is not opened within five seconds. If a POR is performed at this point, then the replacement part can no longer be used in another printer and must be returned to the manufacturer.

  3. Use the Diagnostics Menu to test the replacement part. Do a feed test to check if the problem is resolved.

    • If the problem is not resolved—Turn off the printer, and then reinstall the old part.
    • If the problem is resolved—Perform a POR.
    • If NVRAM error occurs during the replacement, go to NVRAM mismatch failure service check

Warning—Potential Damage:  The controller board may contain a secure element SIM card that must be transferred from the old controller board to the new controller board. This SIM card contains software and security settings that are unique to the printer. See Secure element SIM card removal.

Removal procedure

  1. Remove the controller board shield. See Controller board shield removal.

  2. Remove the inner controller board shield. See Inner controller board shield removal.

  3. Remove all option cards from the controller board.

  4. Disconnect all the cables from the controller board.

    Warning—Potential Damage:  When removing the TPS cable from JTPSAA1 connector, gently pry the cable connector from the controller board connector. Do not pull the cable by the wires.

    Warning—Potential Damage:  Do not yank the ribbon cables. See Disconnecting ribbon cables.

  5. Using a hex wrench or pliers, remove the four hex standoffs (A).

  6. Remove the five screws (B), and then remove the controller board.

After the new controller board is installed, perform printer configuration restoration. See Restoring the printer configuration.
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