HP Color LaserJet 8550 Multifunction Printer series - Manual (Page 203)

202 8 Solving Printer Problems EN
Cleaning the Post Charger
Clean the post charger on the transfer
drum if there are light streaks in halftone
areas.
To clean the post charger
1 Open the right upper door.
2 Locate the post charger unit cleaner
by the transfer drum handle.
3 Slide the post charger unit cleaner
across the bar several times.
4 Push the cleaner back into place.
5 Close the right upper door.