AS-4000 User’s Guide Maintenance If a message is displayed prompting you to clean and you wish to do so, press Clean and go to step 3. C Clean the white calibration tile. U “Cleaning the White Calibration Tile” on page 85 When the cleaning is finished, check the message and press Cleaning Complete to resume the self-diagnosis. If the self-diagnosis is completed successfully, press OK to return to the Check Print Quality screen. D If the message prompting you to clean the white calibration tile continues to be displayed, clean the spectrum sensor module. U “Cleaning the Spectrum Sensor Module” on page 86 94