Tektronix Phaser 600 User Manual page 51

What happens at power-up
Both status indicators (power
light briefly. Messages appear in the display panel (LCD) as the printer
goes through a series of self-tests.
While initializing, the printer makes various mechanical sounds; the front
panel displays this message as it performs an automatic head cleaning
procedure:
The printer takes about 10-12 minutes to warm up and complete the self-tests
(depending on the amount of memory installed).
and error ) on the printer's front panel
Initializing...
Cleaning...
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