HP LaserJet Pro M521 Multifunction Printer series - Manual (Page 205)

4. Dry the glass and white plastic parts with a
chamois or a cellulose sponge to prevent
spotting.
5. Connect the power cable to an outlet, and
then press the power button to turn the product
on.
2
Clean the pickup rollers and separation pad in the document
feeder
If the product document feeder experiences paper-handling problems, such as jams or multiple-page
feeds, clean the document-feeder rollers and separation pad.
1. Open the document-feeder cover.
ENWW Improve scan quality 191