HP 3390 Service Manual - Page 254

Scan-quality problems Preventing problems The following are a few simple steps you can take to improve copy and scan quality. ● Use the flatbed scanner, rather than the automatic document feeder (ADF) input tray, to scan. ● Use high-quality originals. ● Load the media correctly. If the media is loaded incorrectly, it might skew, which causes unclear images. See Loading media on page 26 for instructions. ● Adjust the software settings according to how you plan to use the scanned page. ● If your all-in-one frequently feeds more than one page at a time, you might need to replace the separation pad. See Replacing the tray 2 and optional tray 3 separation pad on page 47. ● Use or make a carrier sheet to protect your originals. Solving scan-quality problems Problem Blank pages Too light or dark Unwanted lines Black dots or streaks Unclear text Description 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 face-down with the upper-left corner of the document at the lower-right corner of the glass. The resolution and color levels might be Verify that you have the correct set incorrectly. resolution and color settings. Ink, glue, correction fluid, or an unwanted Clean the flatbed scanner surface. See substance might be on the glass. Cleaning the flatbed scanner glass on page 56. The ADF glass might be dirty. Clean the ADF glass. See Cleaning the scanner-cover backing on page 57. Ink, glue, correction fluid, or an unwanted Clean the flatbed scanner surface. See substance might be on the glass. Cleaning the flatbed scanner glass on page 56. The resolution and color levels may be Verify that you have the correct set incorrectly. resolution and color settings. 232 Chapter 6 Troubleshooting ENWW