HP 4620 - Manual (Page 31)

Clean the ADF
If the ADF picks up multiple pages or if it does not pick up plain paper, you can clean
the ADF.
To clean the ADF
1. Turn off the printer.
For more information, see Turn off the printer.
2. Remove all originals from the ADF.
3. Lift the ADF cover.
4. Lightly dampen a clean lint-free cloth with distilled water, then squeeze any excess
liquid from the cloth.
5. Use the damp cloth to wipe any residue off the rollers or separator pad.
NOTE: If the residue does not come off using distilled water, try using
isopropyl (rubbing) alcohol.
Maintain the printer 27