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Lexmark CX725

Lexmark CX725

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Sensor (TPS) removal

Note:  For a video demonstration, see Sensor (TPS) removal.

  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 the TPS sled. See TPS sled removal.

  4. Disconnect the thermistor cable (A) from the controller board.

  5. Remove the two screws (B).

  6. Carefully pull the sensor while guiding the black thermistor cable through the hole at the rear of the printer.

  7. Disconnect the three cables (C) from the sensor.

    Warning—Potential Damage:  Press the tab on the white cable while disconnecting it to avoid damage.

Remove the protective tape covering the sensor lenses before installing the sensor assembly.

  • After routing the thermistor cable through the hole at the rear of the printer, make sure that the sensor is placed behind the transfer module retract mechanism to avoid interference with the transfer module retract.

  • After installing the sensor to the printer, restart the printer to test the cable connections to the sensor. A 128.xx error indicates a bad connection at the sensor.

  • Perform the TPS sensor characterization.

    Enter the Diagnostics menu, and then navigate to:

    Printer Diagnostics > Printer Setup > EP setup > Toner patch sensor adjust > Sensor Gain Characterization

  • Perform the TPS sensor calibration.

    Enter the Diagnostics menu, and then navigate to:

    Printer Diagnostics > Printer Setup > EP setup > Toner patch sensor adjust > Full Calibration

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