Phaser 6121MFP Service Manual 5-5Print-Quality TroubleshootingInitial Actions for Troubleshooting Print-QualityCheck the Media and Media SettingsCheck that the media is clean and dry, and that the media used is supported bythis printer. See “Media and Tray Specifications” on page 1-15.Verify the media settings are correct at the Control Panel.Check Printer ConditionTonerLow toner can cause print-quality problems, such as fading, streaking, White lines,or dropouts. Print a small document from different software applications toreplicate the problem and check the amount of toner available. If the toner is low,replace the affected cartridges.CleaningPaper, toner, and dust particles can accumulate inside the printer and cause print-quality problems such as smearing or specks. Clean the inside of the printer toreduce these problems. Refer to “Cleaning” on page 7-2.CalibrationCalibration performs three primary adjustments:• Color registration• Toner density• Toner reproduction curve (used for converting screen colors to CMYK values)For optimum print quality, the printer automatically performs a calibration cycleafter the following events:• A toner cartridge has been replaced.• The imaging unit has been replaced.• 200 pages have printed since the last calibration.• A big temperature or humidity change has occurred.• The printer is restarted after settings have been changed.Normally you would not need to perform a calibration routine unless you arehaving problems with printing colors.
