HP Color LaserJet 8550 Multifunction Printer series - Manual (Page 197)

196 8 Solving Printer Problems EN
(Repetitive defects,
continued) Repeating spots or specks of the same size and shape
appear on almost all pages in the same area of the
page. The repeating defects will generally be dark gray
or black. If the defect is not acceptable, cleaning or
replacing the imaging drum or the transfer drum might
be necessary. If the defect occurs one or more times on
each letter- or A4-sized page, the imaging drum should
be replaced. If the defect occurs on every other letter-
or A4-sized page, then the transfer drum should be
cleaned. For information on cleaning the transfer drum,
see “
Cleaning the Transfer Drum ” later in this chapter. If
cleaning the transfer drum does not correct the
problem, replace the transfer drum or contact a local
authorized HP dealer or service representative for
service. For more information on replacing the imaging
drum or the transfer drum, see the installation guide
included with the drum kit or transfer kit.
Unwanted marks of the same size and shape appear
more than once in the same vertical area on
transparencies only. The fuser roller is damaged.
Replace the fuser. For more information on replacing
the fuser, see the installation guide included with the
fuser kit.
Irregular wavy patterns Irregular wavy patterns in solid fill backgrounds might
indicate that the transfer charger needs to be cleaned.
For more information on cleaning the transfer charger,
see “
Cleaning the Transfer Charger ” later in this
chapter.
Problem Cause and Solution