HP LaserJet 3200 All-in-One Printer series - Manual (Page 215)

EN Product Maintenance
213
Cleaning the scanner path
You might need to clean parts of the scanner if the ink on items you
are scanning can be smudged with your hand, or if the items have
excessive amounts of dust or dirt on them. You might also need to
clean these parts if there are smudges or other marks on documents
or scans of documents.
WARNING!
Before cleaning the HP LaserJet 3200 product, disconnect it from the
power source.
To clean the scanner path
1
Press the two printer door release latches, and open the printer
door.
2
If the long, white strip on the inside of the document release door
is dirty, clean it with a dry cotton swab. If there is still something
on the strip, dab a swab in a small amount of isopropyl alcohol,
and gently clean the strip.
WARNING!
Alcohol is flammable. Keep it away from any open flame. Allow alcohol
to dry completely before closing the printer and plugging in the power
cord.