Tektronix PHASER 380, Service Manual

Page: 135 / 346

Service Manual 5-33
Theory of Operation
5
Printer self-maintenance
To maintain peak operation reliability and print quality, the printer has several
automatic or semi-automatic maintenance functions. These functions may be
started automatically after a certain number of prints or during printer startup,
or they may be started by the customer if a print quality defect is noted.
■
Printhead maintenance cycle
■
Paper preheater cleaning
■
Transfix roller oiling
■
Pick roller cleaning
■
Drum cleaning (chase page)
Printhead maintenance cycle
This topic describes the cleaning cycles used to clean jets of bubbles or foreign
matter that causes a jet to malfunction. Three basic actions take place during a
cleaning cycle:
■
purging
■
wiping
■
flushing
These actions are used in different combinations for three different types of
cleaning cycles:
■
quick wipe
■
short cleaning
■
long cleaning
The long cleaning is described here. The short cleaning and the quick wipe are
basically subsets of the long cleaning cycle.