102 Theory of operation C7085-90921
Introduction
This section presents the theory of operation and the functional overview for HP Color LaserJet
4500 series and 4550 series printers. It provides the service representative with an understanding
of the printing process.
This chapter is also the course material for the Service Authorization class and discusses the
following printing functions:
Basic operation
Image formation
Toner density
Mechanical system
Paper path
DC controller subsystem
Motors and fans
Formatter system
Power supplies
Toner level sensing system
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