Xerox 490ST Xerox Document Centre 490/480/470/460 Reference Guide - Page 331

Problem Copy Quality (cont'd) Symptom Recommendation Moiré - a wavy pattern defect created by the interaction of the halftone frequency on the original and the halftone frequency used to produce the copy l Use a reduced Sharpness setting. l If Auto is selected, use Special or if Special is selected, use Auto. l Use Halftone Photo original type with Special or Auto screen. Grainy or "noisy" pictures l Use Special Screen. l Select Photo and select less sharpness. Fuzzy text or lines l Select Text, Halftone Photo, or Normal type of original. l Increase Sharpness and/or Contrast. Low density images such as pencil marks are not copied Low density images such as paste-up marks are copied l If Background Suppression is On, Darken the copy. l If Background Suppression is Off, turn on Background Suppression. l If Background Suppression is On, Lighten the copy. l If Background Suppression is Off, turn on Background Suppression. Images on the back side of the original print out on the front l If Background Suppression is On, lighten the copy. l If Background Suppression is Off, turn on Background Suppression. l If copying from the Document Glass, keep the Document Glass Cover raised. Lines appear on the copies when the Document Feeder is used l Thoroughly clean the glass under the Document Feeder. Refer to the Maintenance section for additional information about cleaning the Document Glass. Skewed images or sheets l Check area 2 jam clearance handle and in the output tray ensure that it is securely latched. 15. Problem Solving Xerox Document Centre Reference Guide Page 15 - 13