HP LaserJet Enterprise MFP M636 User Guide - Page 237

Improve fax image quality If the printer is having fax quality problems, try the following solutions in the order presented to resolve the issue. ● Check the scanner glass for dirt and smudges ● Check the send-fax resolution settings ● Check the image-adjustment settings ● Optimize fax quality for text or pictures ● Check the error-correction settings ● Check the fit-to-page setting ● Send to a different fax machine ● Check the sender's fax machine Try these few simple steps first: ● Use the flatbed scanner rather than the document feeder. ● Use high-quality originals. ● When using the document feeder, load the original document into the feeder correctly, using the paper guides, to avoid unclear or skewed images. If the problem still exists, try these additional solutions. If they do not fix the problem, see "Improve print quality" for further solutions. Check the scanner glass for dirt and smudges Over time, specks of debris might collect on the scanner glass and white plastic backing, which can affect performance. Use the following procedure to clean the scanner if the printed pages have streaks, unwanted lines, black dots, poor print quality, or unclear text. 1. Press the power button to turn the printer off, and then disconnect the power cable from the electrical outlet. 224 Chapter 9 Solve problems ENWW