HP LaserJet Pro 400 MFP M425 - Manual (Page 194)

Solve scan quality problems
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.
1. Use the power switch to turn off the product, and
then unplug the power cord from the electrical
socket.
2. Open the scanner lid.
3. Clean the scanner glass, the document feeder
strips, and the white plastic backing with a soft
cloth or sponge that has been moistened with
nonabrasive glass cleaner.
CAUTION: Do not use abrasives, acetone,
benzene, ammonia, ethyl alcohol, or carbon
tetrachloride on any part of the product; these
can damage the product. Do not place liquids
directly on the glass or platen. They might seep
and damage the product.
4. Dry the glass and white plastic parts with a
chamois or a cellulose sponge to prevent
spotting.
5. Plug in the product, and then use the power
switch to turn on the product.
Check the resolution settings
The following table describes the recommended resolution and color settings for different types of scan jobs.
NOTE: The default resolution is 200 ppi.
178 Chapter 8 Solve problems ENWW