HP Color Laser MFP 170 User Guide - Page 182

Condition Horizontal stripes Suggested solutions If horizontally aligned black streaks or smears appear: • The imaging unit may be installed improperly. Remove the imaging unit and reinsert it. • The imaging unit may be defective. Remove the imaging unit and install a new one. If the problem persists, the machine may require repairing. Contact a service representative. Curl If the printed paper is curled or paper does not feed into the machine: • Turn the stack of paper over in the tray. Also try rotating the paper 180° in the tray. • Change the printer's paper option and try again. Go to Printing Preferences, click the Paper tab, and set type to Light 60-69g (see "Opening printing preferences" on page 76). • An unknown image repetitively appears on a few sheets • Loose toner • Light print or contamination occurs Your machine is probably being used at an altitude of 1,000 m (3,281 ft) or above. The high altitude may affect the print quality, such as loose toner or light imaging. Change the altitude setting for your machine (see "Altitude adjustment" on page 37). Copying problems Condition Suggested solutions Copies are too light or too dark. Adjust the darkness in copy feature to lighten or darken the backgrounds of copies (see "Changing the settings for each copy" on page 88). Smears, lines, marks, or spots appear on copies. • If the defects are on the original, adjust darkness in copy feature to lighten the background of your copies. • Adjust background in copy setup removes the background color (see "Adjust Bkgd." on page 122). • If there are no defects on the original, clean the scan unit (see "Cleaning the scan unit" on page 152). Copy image is skewed. • Ensure that the original is aligned with the registration guide. • The transfer roller may be dirty. Clean the inside of your machine (see "Cleaning the machine" on page 149). Solving other problems | 182