HP Color LaserJet 8550 Multifunction Printer series - Manual (Page 199)

198 8 Solving Printer Problems EN
Cleaning the Transfer Drum
Perform these procedures only when there is an unacceptable
repetitive defect and the only other solution is replacing the transfer
drum. Many, but not all, repetitive defects can be removed using the
following procedures. Defects that appear as light spots in dark areas
of print are more likely to be corrected by this procedure than dark
spots in unprinted areas. If the procedures are performed
incorrectly or without proper care, the transfer drum can be
permanently damaged.
These procedures require the following items:
z A print sample showing the repetitive defect
z A clean, flat surface to work on
z Isopropyl alcohol
z A hand wipe
CAUTION You can also use a dry, clean, soft, lint-free cloth, such as
cheesecloth, to clean the transfer drum. To prevent scratches on the
drum, do not use any paper products, such as tissue or paper towels,
to clean the drum.
Make sure you have a clean work area free of sharp or rough objects
that might damage the drum. To avoid damaging the drum, remove all
jewelry and watches before continuing. Contact with any of these
items can cause permanent damage.