HP 2840 HP Color LaserJet 2820/2830/2840 All-In-One - User Guide - Page 266
Solving scan-quality problems, Clean the ADF glass. See
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Solving scan-quality problems Problem Blank pages Too light or dark Unwanted lines Black dots or streaks Unclear text Cause Solution The original might have been loaded upside down. In the automatic document feeder (ADF), put the top end of the stack of originals into the ADF input tray, with the media stack face-up and the first page to be scanned on top of the stack. On the flatbed scanner, place the original document facedown with the upper-left corner of the document at the lowerright corner of the glass. The resolution and color levels may be set incorrectly. Verify that you have the correct resolution and color settings. See Scanner resolution and color. Ink, glue, correction fluid, or an unwanted substance might be on the glass. Clean the flatbed scanner surface. See To clean the scanner glass. The ADF glass might be dirty. Clean the ADF glass. See To clean the scanner glass. Ink, glue, correction fluid, or an unwanted substance might be on the glass. Clean the flatbed scanner surface. See To clean the scanner glass. The resolution and color levels may be set incorrectly. Verify that you have the correct resolution and color settings. See Scanner resolution and color. 250 Chapter 14 Troubleshooting ENWW